Passive headphone filters


post separation

Some headphones have an audible treble peak or too much bass/warmth.
For some headphones this can be addressed using a passive filter that connects between the source (amplifier, DAP, Phone etc.) and the headphone itself.
Only some headphones can be improved with a passive filter.
These filters may be interesting for those who also hear (and are bothered by) the effects the filter in question addresses. Those that are not bothered by it should not consider one of these filters as it may take away exactly that which one likes.
I can only create accurate filters from my own (or Sonarworks) measurements because > 4kHz the usual HATS measurements can mask (have a dip) or peak substantially at certain frequencies in which case the correction will be anything but an correction.

Each filter is purpose made for a specific headphone (see list below) and can NOT be used for other headphones. There thus is no ‘universal’ filter.

Passive filters can ONLY attenuate. (Substantial) peaks in frequency response are far more sound degrading than dips. This is what these filters do they remove emphasis and bring it down to the proper level.

The picture below shows what built filters looks like. filters 6.3

For those who don’t want or can’t make passive inline filters (for in the headphone cable) themselves and don’t know someone nearby that can make one for them I offer the opportunity to have your filter of choice custom made by me (solderdude).

The filters are not available from stock so it may take a while before I have time to make you one. It could take 1 or 2 weeks before it can be shipped. Parts may not always be on stock which can increase the waiting period before it is delivered.
There is no obligation to buy when contacting me.

Since I buy parts in small quantities from E.U. sellers and everything is hand-built by me I cannot offer these filters for Chinese-made prices alas nor offer Chinese shipping costs.


The used cable brand is Sommer Cable (Germany) or Cordial. It is a good quality cable and available in red or black. No other cable brands types are available, also not on request.
Various lengths can be ordered, the minimum length is 25cm.

There are only a few type of 3.5mm and 6.3mm and 4-pin XLR connectors available which are listed below. No other brands or types of connectors will be used.

Everything is handmade so can have some cosmetic impurities/flaws here and there.
This is not a factory made product with subsequent pricing.

The filters alone cost between € 15.- and € 28.- depending on the used connectors. (note: shipping costs are NOT included in this price and need to be added).
There are a few shipping options available. Prices for shipping need to be added and range from € 6.10 to € 28.- depending on weight, registered or not and destination.

Payment is due when the filter is about to be shipped. Within EU IBAN bank transfer is possible as well as PayPal.
Because of PayPal fees the price will be about 4% higher when paid with PayPal.
Outside the EU payments using PayPal is the only option (payment in Euros).

There is no receipt with VAT nor other material specifications. Building these filters is a labour of love (costs a lot of time to make it).
Some parts may not be on stock which can increase the waiting time before it is finished.
As I order parts in small quantities only (within Europe) prices, alas, are not ‘Chinese’ nor are the shipping costs I am afraid. Allow some time for the filter(s) to be made.

how does this work

This is not a webshop so when interested in a (listed) filter you need to contact me (solderdude) or fill in the contact form.

What I need to know are the following things:

  1. The filter you need. (choose from the list of available filters below)filter options
    The filter parts incl. assembly but excl. connectors and shipping is € 15.- 
    when you want a specific or custom filter made for a not listed headphone simply contact me.

  2. Which (male) plug you want (the plug that goes into the amplifier/player/phone).
    You can choose from this list of available connectors only.connectors pricing plugs

  3. The cable length you want (min. 25cm) in meters (€ 2.- / meter) and cable color (red or black for TRS, black only for XLR-4pin)

  4. The (female) socket you want (where your headphone plug goes into)
    You can choose from this list of available connectors only.connectors pricing sockets

    Note: I do not have any goldplated 6.3mm TRS sockets.
  5. The preferred shipping method (your choice, discuss this in e-mail):

    signed for with track & trace and insured (price depends on weight)
    sent in a bubble envelope = € 13.80 or € 16.30 (within E.U.) or € 19.80 (rest of the world) 

    For Germany and some other E.U. countries DHL is also possible. Costs will be between € 12.- and € 16.- depending on destination.

  6. Your name, address, e-mail etc.

  7. The preferred payment method.
    IBAN (within E.U.), when using PayPal (add 3.5% + €0.35)

Again, as this is not a webshop there is no ‘buy now’ or ‘order’ button.
You need to contact me via e-mail or use the contact form and simply tell me what you are looking for or want to know.

Filter schematics for DIY’ers

Below the filter schematic for the HIFIMAN Edition Xv2, Edition XX, HE-400S and AnandaFILTER Edition XX

Below the filter schematic for the HIFIMAN HE400i / HE4XXHE400i (HE4XX) filter schematic

Below the filter schematic for the HIFIMAN Sundara

Sundara filter schematic

Below the filter for the NAD VISO HP50
filter schematic

Below the filter for 1More Triple Driver Over Ear Headphones.

1MTDOE filter schematic

Below the filter for Beyerdynamic Amiron Home, DT1770 (when fitted with DT 770 pads)  and DT1990

DT1990 filter schematic-B

Below the filter for the Master & Dynamic MH40


Below the filter for the early (silver) Takstar Pro 82. (not for the black version)

Pro82 old filter

Below the filter for the Sennheiser HD58X and HD660S


Below the filter for the AKG K812K812 filter schematic

The filter below is for the HD800 and can not be used with the HD800S.
It only lowers the 6kHz peak which is the most annoying one for some owners.

HD800 filter schematic

Below a filter for the HD800 with SDR mod and for HD800S. Specifically for those who still find the SDR modded and HD800S headphones a bit too bright.
Takes some getting used to and lowers the details a bit.HD800S filter schematic

Below the filter for the Focal Utopia. It removes the sibilance but leaves the details as they are. Just the ‘sharpness’ it sometimes shows is removed.Utopia filter schematic

Below the filter for the audio-technica ATH-MSR7.MSR7 filter schematic

Below the filter schematic for the Yamaha HPH-MT220. It lowers the warmth and treble peak.MT220 filter schematic
Below a filter that lowers the warmth of the Creative Aurvana Live !
When you feel this is too much simply lower the resistor value to 22Ω or 18ΩCAL filter schematic

Below the filter circuit for the Grado SR60 and SR80. The other Grado’s need somewhat different values. It will at least improve the SR125 and SR225 though.

Grado filter schematic

Below the filter for the Shure SRH-1840.

SRH-1840 schematic

Below the filter for AKG K371

K371 filter schematic

Below the filter for DT880 Black Special Edition with grey EDT990V pads.
DT880 Black filter schematic

Below the filter for the Shure SRH-840

SRH-840 filter schematic

post separation