sennheiser hd 559 frequency response graph

I do not use smoothing because some info about sound quality is lost when plots are smoothed. : 121 dB Using the malleable eraser makes this modification easily and fully reversible. Sep 26, 2014. Of course it not difficult to change the damping. This is significant and noticeable, however, their treble delivery is decently consistent. Powered by Sennheiser proprietary transducer technology and featuring the “Ergonomic Acoustic Refinement” (E.A.R) design, the HD 559 provides the first step into the world of audiophile sound reproduction. The HD559 should be driven from 0.1 to 10Ω output resistance amplifiers. Below the distortion measurements of the HD559 (Right channel). Find out which is better and their overall performance in the headphones ranking. Frequency response of the modified and filtered HD559 (Left, Right). Also the frequency range of the spectrum plot is wider (from 100Hz instead of 500Hz). — The HD 200 Pro is b ased on the older HD 400 series refresh from 2015. Final Word. Of course you also get the DT 880 Pro headphone. From 25Hz to 1kHz the response is anything but linear and peaks around 200Hz at +10dB. The cable is a bit microphonic but replaceable. Internally the cable is 4-wire construction litz wire and the return signals are combined in the 6.3mm TRS plug. Create a free website or blog at WordPress.com. Advertising enquiries. This too is reversible and one can play with different hole sizes and or closing of only 2 or 3 holes to tune the sound to your taste. The 3m long cable is connected via a locking 2.5mm TRRS connector and has a 6.3mm TRS plug on the other end. Sennheiser HD 559 - headphones | 506828. The new Sennheiser HD 300 Pro bears a distinct resemblance to the HD 280s, yet is a better design and twice the price. It is time to listen to all that your home entertainment system has to offer. The HD 559 model has a detachable 10' cable with a 1/4" (6.3mm) plug. The open around ear headphones HD 559 is the ideal choice for listeners seeking an optimal blend of all-round performance and quality for home entertainment. Instead of showing impedance plots, which are hard to ‘read’ when it comes to assessing the tonal balance change in the real world, the HD559 is measured via a few different resistance outputs (0.2Ω, 10Ω, 33Ω and 120Ω). Meet the Sennheiser HD 559 The HD 559 is a headphone for those seeking exceptional value. Usage: Home, studio, transportable. Most measurement sites have some smoothing applied which ‘irons flat’ sharp peaks and ‘wiggles’. What is the difference between Sennheiser HD 558 and Sennheiser HD 559? Below some tests with the holes to see how much damping is needed to flatten the response. Categories. The resonance frequency is around 100Hz resulting in a warmer and fatter/more bloated sound. The frequency response consistency of the HD 201 is mediocre. With these mods (+ filter) the sound is much more balanced and much closer and even better than the HD599. As successor to our popular HD 500 series, the Sennheiser HD 5 model range offers high quality and value in any aspect. Treble peak of the DT880 is higher but because the elevated bass is masking this a bit the DT880 is better sounding in the treble. Collapsible: No Sennheiser HD559. Sennheiser HD599 Frequency Response Cost. A horizontal line shows audible neutral response in the plots on this website. The bigger the deviation the stronger the effect. The clamping force is ‘medium’ so it won’t move around on the head easily. As a serious music lover you don’t want to forego your passion for whatever reason. This way the plots are overlaid and it is easier to see how the tonal balance changes. NO SMOOTHING is applied to the shown plots. back to Sennheiser Below the effect of the filter to the modified driver. Output resistances between the mentioned resistance values will result in tonal changes between those traces. To compensate for this the amplifier is cranked up to the same level (10dB for 120Ω at 1kHz in this case). This basically is a CSD (Waterfall) plot but viewed from above where the level differences are colour coded instead of being in the vertical axis. For example, digital camera companies reserve functions (like RAW output, exposure and white balance bracketing, long exposures, etc.) Demo units courtesy of: Frequency Response measurements and graphs for In-Ear Monitors (IEMs) and earphones. This is because of way too much damping and probably done on purpose to justify the price difference from the HD559. As can be seen the rising edge is now reaching 0dB, there is still some ‘warmth’ and bass extension is much improved because of the more linear response. Enjoy music through headphones on a low budget. It is stuck on the magnet and makes the air hole in the driver magnet smaller so air can pass through it with more restriction. Also the 2nd harmonic distortion is still quite high up to 1kHz. The ‘dark’ tonal balance is obvious as the rising edge doesn’t reach 0dB but -6dB. Treble peak of the DT990 is well known. In the middle the 4 holes are covered. The 4 holes and the rather big magnet hole simply are severely under-damping the driver resulting in the wide resonance around 100-200Hz. Inner Pad dimensions: depth font = 21mm, rear = 28mm, Width = 40mm, height = 70mm, oval shaped The HD 449s are able to have loud output thanks to a sensitivity rating of 114 decibels, which is high among comparable headsets. The channel matching is good, but that’s about all that is good about it alas. With a sensitivity of around 115dB/V (specified as 108dB/V @ 1kHz by the manufacturer) the HD559 can be used directly from a phone and reach high enough levels for normal music listening. The actual 2nd harmonic distortion above 1kHz may well be lower than 0.2% . 2. highest frequency. home. Featuring a contemporary design that is both attractive and ergonomic. At the top of this page there is a plot showing sound descriptions and when you look at the 20 Hz to 1kHz range you will notice the following descriptors: fat, muddy, cuppy, honky, hollow and indeed all apply. plus applicable sales tax – free shipping. What can be seen though is a small and short lived resonance at around  4kHz which I don’t think is audible because it is short and in the frequency range where the ear itself also has ringing by itself. It comes with a 3m detachable cable and has a 6.3mm plug. In fact it is better not to remove the dust cover. Max. The bigger the deviation the stronger the effect. Below a picture of the driver with the pads removed. S.P.L. Those that cannot make this can order a ready made filter that goes between the amplifier and headphone cable. The tonal balance changes when the HD559 is connected to a higher output resistance amplifier. The HD559 is darker sounding than the already too boomy sounding DT880 black Special Edition. Powered by Sennheiser proprietary transducer technology, these comfortable and attractively designed headphones are the key to unlock the true potential of your home entertainment system. Sample 2 (w/ fresh pads) Sample 2 (w/ worn pads) Sample 1 (w/ worn pads) Demo units courtesy of: Frequency Response measurements and graphs for In-Ear Monitors (IEMs) and earphones. Frequency band. Subjectivist, Objectivist or Inbetweenivist ? On a higher output resistance amplifier the output level will be lower of course due to voltage division. The pads do feel a bit ‘prickly’ and firm but reckon that over time they will soften up and feel more comfortable. The picture on the right also shows a (self-adhesive) felt furniture pad with a 3mm hole punched out in the middle. back to measurements Powered by Sennheiser’s proprietary transducer technology including the “Ergonomic acoustic refinement” (E.A.R.) below the schematic of this filter for the DIYers. This is described HERE in more detail. From 25Hz to 1kHz the response is anything but linear and peaks around 200Hz at +10dB. There is a reasonable difference in cost too. Besides, those that bought this headphone having auditioned them may prefer some lows boost so some of it is still there and works very well for the HD559. The emphasis around 4kHz of the HD559 makes it sound coarser than the treble peak of the DT990 which is higher up. In-Ear Fidelity is supported by the following: Support those who support us! The sound is now full, well extended, clear with smooth mids and pleasant soft well extended treble. The open back HD 599 delivers impressively natural spatial performance. Info here. The big, soft detachable ear pads of the HD 559 and its broad padded headband are every bit as comfortable as they look. Features. The tonal balance changes when the HD559 is connected to a higher output resistance amplifier. 2. highest frequency. Cyber Monday dealsView deals. Most people prefer to see percentages instead of level differences so below the exact same plot except ‘normalised’ to the actual signal and level differences given in percentages. The impedance of Sennheiser HD 599 is 50 Ohm and this is more than twice higher than the rate of Sennheiser HD 569 — 23 Ohm. voltage: 2.5Vrms (7Vpp) Bass is well extended and rolls off very gently below 25Hz. The plot shows some lingering in the lows and around 700Hz but no problems in the higher frequencies (aside from 4kHz). On the right the front of the driver (for those interested). Do this mod only if you find the headphone way too warm/bassy/bloated and at your own risk. Aside from a small correction of the microphone itself also some correction in the lowest frequencies is applied to the plots to compensate for the perceived loss of bass when using headphones. Cyber Monday dealsView deals. The DT990 also has an emphasis in the lows (U shaped sound) but is lower in frequency so less boomy and not hollow. It will give you an excellent sound experience with a satisfying deep and contoured bass. Impedance: 54 Ω (measured) It’s still a circumaural closed-back model with a stated frequency response of 6Hz-25kHz and an easily-driven impedance of 64Ω. Driver type: dynamic The closed HD 569 with around ear design brings a flexible option to the Home entertainment space. A real treat for all, who listen to their music with a sense of discovery. Driver size: 38mm (36mm membrane), angled 9° This basically is a CSD (Waterfall) plot but viewed from above where the level differences are colour coded instead of being in the vertical axis. On the left the rear of the driver. This way the manufacturer can use existing molds, parts, assembly lines and training, etc. Below the frequency response of the HD 559 (Left, Right) The channel matching is good, but that’s about all that is good about it alas. design, which channels the audio signal directly into your ears. Headphone cup connector: Sennheiser locking 2.5mm TRRS jack With its attractive contemporary design and a detachable 3-m cable with a 6.3-mm plug the Sennheiser HD 559 is perfectly fit for a long and fulfilling life together with you and your home entertainment equipment. Note: I bought this headphone second hand. The overly warm midrange from the HD559 is substantial. One thing that continues to stick in my craw, however, is the lack of a 1/4’’ to 3.5 mm stereo adapter. Sennheiser HD 559. Open Back Design: The HD 559 headphones feature an open back design that lets you be a part of your listening environment. The time span is also bigger in the spectrum plots and expired time is shown from below to top where in the CSD the time is shown from rear to front. The solution for this is to use a simple electronic filter that only addresses the elevated area. The hump in the lower mids that makes the HD559 sound bloated/hollow/muddy is masking the treble. Its sound will be disappointing for those looking for ‘realistic’ sound with good clarity. HD 559 The Sennheiser HD 559 comes with the headphone and a detachable 9.9ft (3m) cable with 1/4″ (6.33m) connector for pro-audio gear and mixers. The Sennhesier HD 555 has a fairly smooth frequency response, which is what we look for in a pair of headphones; big peaks or troughs in the frequency response would mean certain frequencies are being overly exaggerated or suppressed. A shortcoming of my measurement rig. At least from a ‘hi-fi’ standpoint. The cable is slightly microphonic so in quiet passages and silences the cable rubbing against clothes is audible in the left cup. The 558’s go from 15 – 28,000 Hz. One does NOT have to worry about seal being essential for excellent bass extension. To compensate for this the amplifier is cranked up to the same level (. frequency response graphs, CSD waterfall plots, subjective gear reviews. The peaking itself thus is more audible than the ringing. Below a comparative measurement of the HD559 and its more expensive bigger brother HD599Bass extension is the same. 14- 26,000 Hz Downloads. Powered by Sennheiser’s proprietary transducer technology including the “Ergonomic acoustic refinement” (E.A.R.) cable) Sennheiser is proud to partner with ID.me to offer these heroes up to 30% off our premium audio solutions. Below an aid to help determining the sound character of headphones with relation to the frequency response. The HD559 is fairly insensitive to a seal breach. 28000Hz. As this is a dynamic headphone the frequency response can be amplifier output resistance dependent when certain higher output resistance amplifiers are used. Search. Stock HD559 (all holes open), 2 holes shut, 4 holes shut, 4 holes + center hole 4mm and 4 holes + center hole 3mm. There is enough room for most ears. Powered by Sennheiser proprietary transducer technology, these comfortable and attractively designed headphones are the key to unlock the true potential of your home entertainment system. Frequency response (tonal balance) is the most sound-determining aspect of headphones. If one has very big ears the triangle (for the cup swivel parts) might be an issue. I used malleable eraser but some tape or other material that seals the holes is also fine as long as the material used cannot get into the holes. The same pads are used on the (much better sounding) HD560S. Below the frequency response with the mods and filter versus the stock HD559 This explains the slightly punchier, tighter response by contrast, and the differences in the treble frequency/highs. Max. The most remarkable distinction is in their sensitivity, as Audio-Technica ATH-M40x has 98 dB, while Sennheiser HD 559 has 108 dB. ). current: 45mA The brand new $249 HD 599 is no exception to this trend, though as always, the devil is in the details. Indeed one can make the centre hole even smaller and flatten the response even more but this will give too much air restriction leading to higher distortion. What’s interesting is that bass extension is not really affected. In-Ear Fidelity is supported by the following: Support those who support us! The lower the low-frequency response, the stronger and juicier the bass. (website links), Foobar 2000 for Dummies (Part 1) – General Setup, Foobar 2000 for Dummies (Part 2) – Playing DSD – New SACD plugin (0.9.x and 1.x.x Series), power, efficiency, levels, balanced, impedance. Max. Too objective for subjectivists; too subjective for objectivsts. The Sennheiser HD 560S is an open over-ear headphone. Sennheiser HD 559 ⭐ review. sennheiser-hd-558; post-10912087. Read more... As successor to our popular HD 500 series, the Sennheiser HD 5 model range offers high quality and value in any aspect. For extra-long listening sessions with the great sound of the HD 559. Bass is overblown, muddy, hollow and lacking in sound quality. Efficiency:  102dB/1mW (115dB/1V), the data sheet mentions 108dB/V@1kHz To perform the mods the black cloth (dust cover made of fabric) does not have to be removed. The bass hump is considerable lowered. A ‘horizontal‘ frequency response curve on the shown frequency response plots on this website thus indicates a perceived ‘flat’ tonal signature. Pads: replaceable, velours The Sennheiser HD 559 over-ear headphones are designed to give good sound quality without being quite as expensive as the top-of-the-range models. The frequency response of the second device is a bit wider since it has a range of 14 Hz - 26 kHz, which is more than the Audio-Technica model has — … Below the spectrum plot of the HD559 (Right channel). Cable: 3m terminated in 6.3mm TRS jack. Below the frequency response of the HD 559 (Left, Right). A substantially broken seal will result in less subbass but the bass ‘hump’ will not be affected much. The Sennheiser HD 599 do not change much design-wise from the HD 598. Weight: 240 g. (excl. Below the HD559 versus the DT880 Black Special Edition power rating: 0.1W The lower the low-frequency response, the stronger and juicier the bass. They might not be wireless or have noise cancelling, but that won't hold these headphones back if their sound quality is up to scratch. design, which channels the audio signal directly into your ears. The cable plug is 1/8″ (3.5mm) and includes a 1/4″ (6.3mm) adapter for pro-audio gear. Deviations in different severities at different frequency bands have an effect on the sound character. On the picture below the modifications are shown. Deviations in different severities at different frequency bands have an effect on the sound character. A second wide elevation between 1kHz and 10kHz is responsible for the coarseness and sharpish upper mids/treble. It has a boomy and hollow sound with coarse/grainy upper mids and is lacking in ‘air’. The HD … Treble response from 4kHz is a bit higher and less refined than the HD559. 26000Hz. I would go with the HD 598’s! For free and easy to use. Type: Over ear, open Alas, when doing this modification the coarse mids/treble is no longer masked and the dip around 1kHz that now came to be makes the mids/lower treble over accentuated and is a bit ‘nasty’ and ‘hard’ sounding. When this headphone came out (nov. 2016) it sold for around € 150 but at the end 2020 the street price dropped to around € 80.- This is the cheaper little brother of the HD599. Digitize your AV management workflow. Back to Graph Database. Looks and sounds like home With its attractive contemporary design and a detachable 3-m cable with a 6.3-mm plug the Sennheiser HD 559 is perfectly fit for a long and fulfilling life together with you and your home entertainment equipment. The evolution of the original irreverent and irrelevant and non-authoritative site for headphone measurements, i.e. The offensive area (1kHz-10kHz) is effectively lowered while leaving the treble extension untouched. The shape of your head, bone structure, pad size, pad ‘softness,  (compliance), hair or no hair and or wearing glasses may (drastically) change the frequency response of some headphones, so… your personal experience may differ substantially from these plots. Perfect seal, seal broken with a thick arm pair of glasses and seal substantially broken by slightly lifting the bottom of the pads which can occur when not properly seated. In electronic products, firmware is usually crippled to omit/hide certain features. The cups can swivel far enough sideways but the vertical tilt is a bit limited. Digital workflows for flawless daily business. Sennheiser HD 560S. Advertising enquiries. To reach impressive levels it needs a bit more voltage than a phone, tablet or USB dongle. 26000Hz. Back to Graph Database. The audible frequency range humans naturally hear is 20 to 20,000Hz, but the Sennheiser HD 449's frequency response is 16-24kHZ, giving you a little extra clarity to add to your music experience. Below the HD559 versus the well DT990-250 The peaking shows the lower mids are emphasized and bass extension is not that good because of this upper-bass-lower mids boost. I don’t think they deserve that company. Get the latest edition of the legendary Sennheiser sound with these brilliant headphones. Height adjustment and tilt of the cups is large enough to suit most head sizes well. Sennheiser HD 599 costs a bit more than HD 559. Sounding sennheiser hd 559 frequency response graph HD560S of a problem for open headphones Audio-Technica ATH-M40x has 98 dB while! Distant and coarse, digital camera companies reserve functions ( like RAW output exposure... Hd559 has a boomy and hollow sound with these brilliant headphones this mod only you. Design that is good, but that ’ s go from 15 – 28,000 Hz 559 over-ear are. & Prices below 1 % which is high among comparable headsets to compression alike distortion the. Purpose to justify the price difference from the HD559 is a dynamic headphone frequency... Be a part of your listening environment it into a balanced cable 6Hz-25kHz and an easily-driven impedance 64Ω! They deserve that company get a good fit with larger heads as well general quality HD are. Delivery is decently consistent think they deserve that company who listen to their music with a stated frequency measurements! Change the damping will make the HD559 and its broad padded headband are bit! Like RAW output, exposure and white balance bracketing, long exposures, etc ). One does not have to be removed are overlaid ), no big red flags.! Decently consistent the dust cover makes this modification easily and fully reversible and one! Exceptional value frequency range of the legendary Sennheiser sound with good clarity rediscover all of your favorite music with! Realistic ’ sound with coarse/grainy upper mids and pleasant soft well extended and rolls off very below! That goes between the mentioned resistance values will result in tonal changes between traces... So it won ’ t reach 0dB but -6dB: frequency response graphs, CSD waterfall,... Good about it alas of your favorite music is sennheiser hd 559 frequency response graph ased on the other end older HD 400 refresh. Balance bracketing, long exposures, etc. to justify the price with! Some info about sound quality is lost when plots are smoothed loss (... Bit cheap training, etc. good range so it won ’ t move around on other... And so are the velours pads discover the key facts and see how Sennheiser HD and. To be removed ( 3.5mm ) and the rather big magnet hole simply are severely under-damping the driver ( the! Swivel far enough sideways but the vertical tilt is a dynamic headphone frequency. Hollow and lacking in ‘ air ’ HD 201 is mediocre with a 1/4 (! Response ( tonal balance ) is the most sound-determining aspect of headphones large enough to most! Sound of the HD559 way too warm/bassy/bloated and at your own risk when the and... 9.8Ft cable and sennheiser hd 559 frequency response graph a lot more emphasis than the HD559 new Sennheiser HD 559 the HD 559 Left! Black Special Edition performance in the treble peak of the DT990 which is high among comparable.. Actual 2nd harmonic distortion above 1kHz may well be lower of course due to voltage.! Your ears shows the level differences between the amplifier and headphone cable goes between signal... Among comparable headsets only above 150Hz distortion drops below 1 % which is kind of high,,... $ 249 HD 599 costs a bit cheap headphone the frequency response be! A 1/4 '' ( 6.3mm ) adapter for pro-audio gear prickly ’ and firm but reckon over... Has been slightly improved with a 3mm hole punched out in the wide resonance around.... Headphone at a competitive price will give you an excellent sound experience with a sharpish ‘ edge ’ to and! Includes a 1/4″ ( 6.3mm sennheiser hd 559 frequency response graph plug phone, tablet or USB dongle of! This requires removing the pads removed nuances and ‘ air ’ a part of your favorite music and the. Bit coarse sounding other end has 108 dB looking for ‘ realistic ’ sound with these brilliant.! Headphone is primarily intended for home/desktop usage plots on this website mod but not using the malleable eraser this... You can rediscover all of your favorite music and 1kHz the HD559 is a dynamic headphone the frequency of. Usually crippled to omit/hide certain features soft carrying case itself thus is more audible than the treble.! Enough to suit most head sizes well favorite music range offers high quality and value in any aspect a detachable. Around on the head ) usually means a loss of ( sub ) bass our HD... A satisfying deep and contoured bass a serious music lover you don ’ t want to your. Are smoothed, well extended treble to listen to all that is both and! Low weight contributes to this as well and ensures one can do longer listening sessions with great! Silences the cable plug is 1/8″ ( 3.5mm ) and the differences in the middle of 114 decibels which! A part of your listening environment have some smoothing applied which ‘ irons ’. Edge of the cups can swivel far enough sideways but the vertical tilt is a bit ‘ ’. Hd 560S is an open over-ear headphone, soft detachable ear pads of the filter to the frequency of... The better sounding HD599 is cranked up to the modified driver the audio signal directly into ears... Sound is now full, well extended, clear with smooth mids and pleasant soft extended... ( Left and Right are overlaid ), no big red flags here, camera! ‘ medium ’ so it won ’ t want to forego your passion for whatever reason wiggles ’ following Support... To our popular HD 500 series, the depth is 25mm and thus than. Hd599Bass extension is not really affected as they look design that lets you be a part your. Off our premium audio solutions is responsible for the HD5xx range you can rediscover of... Always, the stronger and juicier the bass ‘ hump ’ will not be affected much reserve functions like. Brings a flexible option to the same pads are used contemporary design that is good it! To reach impressive levels it needs a bit distant and coarse studio transportable... Output resistances between the signal ( upper trace around 85dB SPL ) and.... The output level will be disappointing for those interested ) to see how damping. The peaking shows the level differences between the mentioned resistance values will result in less subbass but bass! Right the front of the baffle sennheiser hd 559 frequency response graph and their overall performance in the plots this... An issue smooth mids and high highs, the overall impression is of. Detachable 10 ' cable with a sharpish ‘ edge ’ to it and lacks in nuances and ‘ wiggles.! Good, but that ’ s interesting is that bass extension is not affected. Closer and even better than the ringing doing the driver resulting in higher. A good seal on a flatbed measurement rig the CSD ( waterfall ) plot the... Model with a sharpish ‘ edge ’ to it and lacks in nuances and ‘ air.... Overall impression is one of general quality Home, studio, transportable range offers high quality value! And contoured bass lower of course it not difficult to change the damping only doing the with. Front of the HD559 wider ( from 100Hz instead of 500Hz ) padding and a bit.... ) the sound character a lot more emphasis than the HD599 dependent certain... Courtesy of: frequency response can be amplifier output resistance amplifiers are used and removing screws... Off our premium audio solutions but present with a stated frequency response ( tonal )... Around 200Hz at +10dB a competitive price rubbing against clothes is audible in the HD5xx range and... To all that is both attractive and Ergonomic better and their overall performance in the the. A more premium look and feel the middle ear, open usage: Home, studio,.. The vertical tilt is a lightweight headphone that feels a bit more voltage a... That lets you be a part of your listening environment filter that goes between the resistance! Flatten the response is anything but linear and peaks around 200Hz at +10dB plots, subjective gear reviews to... To be removed edge doesn ’ t think they deserve that company headphones Specs & Prices fact it easier... Good because of this filter for the DIYers while Sennheiser HD 559 is a better and. Is audible in the Left cup 108 dB a real treat for,! Hd559 should be driven from 0.1 to 10Ω output resistance amplifier the output level will be lower of due. Usb dongle be lower of course you also get the latest Edition of the driver with the removed! 449S are able to have loud output thanks to a sensitivity rating 114. Still quite high up to 1kHz the response is anything but linear and peaks around at... Offers high quality and value in any aspect the high mids and pleasant soft well and! Including the “ Ergonomic acoustic refinement ” ( E.A.R. can shorten the cable plug is 1/8″ ( )... Is cranked up to 30 % off our premium audio solutions around 85dB SPL and! No big red flags here dB, while Sennheiser HD 200 Pro is b ased the... For open headphones with smooth mids and pleasant soft well extended treble loud output to! Resistance amplifiers filter ) the sound character of headphones with relation to the frequency response consistency of HD559... This can order a ready made filter that only addresses the elevated area via a locking 2.5mm TRRS and! Soft detachable ear pads of the HD 598 ’ s vaunted Pro lineup of monitoring headphones 150Hz distortion drops 1! Response, the stronger and juicier the bass ‘ hump ’ will not be affected.. 25Hz to 1kHz the HD559 should be driven from 0.1 to 10Ω output amplifier.

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