The Audiophile Uber moded Sennheiser HD25-1 mk II are now officially for sale
As you may or may not know – we have been working on some sonic modifications to the sennheiser HD25-1 for over a year now and I am now pretty sure we have squeezed almost every drop of awesomeness out of them now.
We have been pulling apart and modifying the HD25 for four or five years now and after over a year of tweaking and testing we are now offering the Uber edition for sale to the general public. The HD25 have been around for 25 years now and have won acclaim for their flat response, fun sound and detailed mids. They are great headphones with a brilliant reputation but we always knew they had more to give. These Uber edition ones have several modifications to squeeze more detail across the range and help them drop lower for better resolution in the bass/ sub bass region.
The modifications we have done to these are as follows ..
We have uprated the damping in the earcup to make them sound more open – essentially we have removed the felt disc inside the earcup and instead lined the inside of the cup with bituminous vibration ramping material – this stops resonance in the earcup an helps them sound more open as there is a bit more air volume to play with behind the driver.
We have mass loaded the rear of the driver and the driver enclosure. As you may know every action has an equal and opposite reaction – due to the HD25s lightweight construction a fare amount of the energy from the driver goes into vibrating the earcups. We have added lead weights strategically placed on the driver to add extra weight in the right places to ensure that more of the energy from the diaphragm is turned into sound rather than being absorbed by vibrating the casing. This gives a lot more bass detail and makes them less boomy – you can hear a lot more texture and impact in a basslines. After we had done that ther was probably a bit too much bass so we have also reduced the size of the bass ports in the driver which further tightens things up and stops the bass from overpowering the mids/ highs
Thirdly and probably most importantly we have replaced the steel cable they come with as standard with one of our audiophile cables http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=140983727006&ssPageName=STRK:MESE:IT
They come with a steel cable as standard as they are designed for use by camera men and audio pros – the steel gives the cable high tensile strength while keeping it light weight but is not great for sound quality. Some people are not cable believers and personally I would be hard pressed to tell the difference from one copper cable to another but the jump from steel to spc is very noticeable. The steel cable has a resistance of 4ohms and the audiophile cable is not measurable with a standard multimeter – this is because silver has much lower resistance meaning more of the signal from your equipment goes into making sound rather than heat. The cable is also braided by hand and covered in PTFE to protect it from RFI and EMI and has 4 cores – with seperate negative cables for left and right to help a little with crosstalk or we can re-wire them to give a balanced connection for a little extra.
As I said – We have been testing them for quite a while and have been lucky enough to have them reviewed online already – http://www.inearspace.co.uk/inearspace/Custom_Cans_Uber_Modded_Sennhesier_HD-25-1_II.html – the ones we sent for review were airbrushed but the rest of the mods were the same as these.
We were also lucky enough to make a pair for a few top audiophile DJs like Mr Scruff ( our favorate DJ here in the office 😉
Photograph by http://www.raychanphotography.com/
We also had a few pairs we were showing off at the Head-Fi meet in London which wend down so well that we had quite a few people ask to buy a pair as a result which has prompted us to list them on ebay
The headphones will come in plain black apart from the cable which you can have in any colour – Or if you want something very special we can customise the headphones but they will be £40-£70 extra depending on the design
They are already listed on ebay
Or if you want to order a custom pair just fill in the form on the page below
http://www.customcans.co.uk/pages/HD251Info.html