well..as some of u may know...we had a headphile mini meet yesterday (22nd July) and due to that....i had a mAD idea...as well as itchy hands

and so i present to u...my Franken PhilKoss (as named by scottiebabie in the gathering thread..thanks dude.. was thinking of a good name for it ).

what i did was transplant the Koss KSC75 into the housing of a Philips HP2000. if ur wondering why i chose the HP2000....simple.. i wanted a fully black headphone to go with my all black PC. and the HP2000 was the only one i could think of and it was cheap...bought it used for RM35 specifically for this reason from the Garage Sales section .

i also had the choice of putting it into the Koss UR20 (also all black) housing which i have, but i dont really like wearing those cans. hence the choice of the hp2k. that and also the housing is exactly like the Philips HP250 which i have and have found quite comfortable. only a different colour.

ok...seriously...i thought this was gonna be a simple plug and play mod...boy was i wrong!!! first off the KSC75 drivers CANT be taken out of the grey housing... so i had to figure out a way to fit them into the HP2000. this mod took me 2 weeks...as i dont really have much free time to myself..up to a point i was drilling stuff for the mod at 2-4 am for 2 nights...best part is....i did all the drilling in my toilet...hahahahahah..so u can imagine the noise...im surprised my neighbour didnt complain as my toilet window is right next to their house

anyway, on with the prawn pix....

first off... we have the stock standard and very good condition used Philips HP2000. yes, the background is my bedsheet



next, a pair of brand spanking new Koss KSC75 (thank god i bought 2...ull see why later on)



heres a pic of the HP2000 driver housing from the outside with the pads taken off... notice the holes..



unscrewed the driver housing from the cup..



heres a closeup of the original driver in the driver housing and the insides of the cup and the stock cables as well...notice the high tech "strain-relief" for the cable. i was wondering how to make a strain relief for my new cables, and this was a very good and very simple idea...which i of course implemented



here we have the KSC75 drivers...as u can see i shaved off the sides (the part where the pad hooks on to). side by side with stock... pls notice that i also shaved off the part where the cables are supposed to be.... DO NOT DO THAT!!! I KILLED THOSE DRIVERS BECAUSE OF IT!!!

top n bottom image



heres why i said i was lucky i bought 2 pairs... i had another pair to play with. i shaved off the same section of the driver housing again.. but this time i left the part where the cables are supposed to be alone...didnt wanna screw it up again coz thats where the wires from the connections to the membrane are at. i used a round file and stuck it in a corded drill to shave it off. much better results than the previous pair where i used a scissors which hurt my hand.



closeup..notice the part where the cable comes out...i left it untouched this time...



a closeup of the cable connection cover...i used the drill+file again to enlarge the exit point coz ill be using thicker cables than the stock. yes...i wanted them in there as well...to hlp keep the cables in place.




interesting so far??? continued in next post

This post has been edited by mADmAN: Jul 23 2007, 03:18 AM

ok..lets continue...


next i drilled the driver housing...remember the stock holes? friggin puny...decided to "kramer mod" the housing... check out muh ULTRA L33T drilling skills LOL!!! gimme a break ok??? i havent touched a power tool in years!

i also enlarged the balance of the holes n made them just slightly bigger...




now comes the part where im actually slightly good at (at least better than all the rest ive been doing with this mod ) ... DIY cables.. made new cables for the cans.. used Canare L-4E6S StarQuad cable and Canare F-12 3.5mm stereo mini plug with black sleeves. the big black sleeve i bought from forumer nichalasteo from the bulk order section and the small ones after the split i bought from forumer vcool.








trimming the sides of the KSC75 actually made it fit nicely into the driver housing (that ring part) but seeing how i DIDNT trim the part where the cables come out...i had to trim the driver housing a little...so i used a nail clipper and clipped away a little of the housing ring thingy...the part i cut off is in the yellow box... this means the drivers can only fit into the house in 1 direction/ 1 way only.



test fitting the drivers in the housing after cutting off the housing.



next after recabling them with the starquad, i secured the drivers into place. secured only using a little super glue. this is because i plan to take them out again 1 day and plan to totally cut out and replace those stupid holes i drilled with a proper wire mesh...provided i can find something good and strong enough...mosquitor nets are too soft...might go for some kitchen sink crap stopper.. will probably epoxy the mesh directly to the driver housing...after thats done ill probably epoxy the KSC75 drivers to the housing as well. making them permanent.

heres a pic of the back and front after securing the drivers into place with superglue. and no im NOT promoting the superglue



whoops...10 pix limitation per post reached...let us continue on the next post...

This post has been edited by mADmAN: Jul 23 2007, 03:09 AM

last but not least....part 3!!!

well...after its all said and done... i put it back together, brought it to my office for my colleague (owns HD595+GoVibe 5) and my director (HD650+Darkvoice 336i) to test...i wanted to test it as well as i havent really listened to it...and after the 3 of us tested...the result? crap. seriously..crap.

reason for the crappy result? the cup. it was so thin and plasticky that it made the headphones sound so 'can-ish'. the sound was so friggin thin...and so friggin hollow.. it really had no body watsoever. we realized it was the cup that made it sound that way so we decided to add a little something into the cup to make it more...'sturdy'.

so i added the blue stuff (using double sided tape)..its a foam/spongy thingy...originally bought as a huge mat for the office toilet floor..hahahah yes, im serious..but the thing soaked up water and made the toilet squishy..so we washed it off, dried it.. and stored it for over a year...it occasionally gets cut out for some use here and there...we even cut off some to line a door to block out some noise (which worked very well). but the best use is as a padding of sorts to not scratch valuable stuff LOL. adding this gave the headphones a little body...it considerably improved the sound...but it still sounded very 'can-ish'.



next i had the idea of buying some cheap sound insulation material from a car audio shop. but my director came up with a good on the spot idea. we added a different type of foam. this foam is from a cheapo MSI motherboard. u know when u buy some motherboards it comes with a black foam thingy right? well this is the foam. we cut it out to size and just shoved it in the cup. i was worried the drivers wouldnt fit...but it did..with only VERY little force.



sorry for the blurry pix...only had my phone (w810i) at the time.

adding the black foam helped to improve the sound even more. gave it much more body... so finally i packed everything up and assembled everything... next are beauty shots of the completed headphones accompanied by the headphone stand i got from Jaben Network.







so my take on the cans? first off...lemme state that im more used to the DT990 which are superb in bass and highs. and i also prefer that. theyre not that bright either...i listen to metal, and getting the bass 'kick' with metal is no real easy task especially with headphones. the DT990 does it quite well imho but ive always thought the stock KSC75s had almost no bass. although for metal i do think the KSC75s sound way better than the Senn HD595. especially with the in-your-face mids.

anyway...theyre typical of unburned KSC75, it sounded bright..the ones i modded havent been burned in yet though. and also even though it had ALOT mroe body than it first did...i think it still sounded thin... i plan on changing the black foam with sound insulation material from the car audio shops. perhaps i might line the cup with blue-tak as well hoping that it gives more body.

but other than that, im happy with the mod.. some forumers found them quite good during the meet. but ill let them write their own review here as im curious to find out what they think about it in detail as well..... so guys who tested it out..pls do give ur review of my modded cans.

total cost? no idea. but i guess roughly around RM180 if u buy all brand new parts not inclusive of the foam thingy.

is this mod worth it? yes, if u have the tools and ESPECIALLY the time. it was tough for me considering i had to rush it with the very little time i have (finish work 10-11pm everynight) in order to make it for the mini meet. plus killing one pair of the drivers seriously didnt help matters. i also didnt have a drill...luckily my sis has one so i borrowed hers. i also bought the round file specifically for this mod.

anyway. thats it. pls do post ur comments... and especially to those whos tested it. do write ur review here.

thanks for viewing

EDIT: forgot to mention that for some reason these cans are hard to drive. i did NOT do any mods to direct affect the efficiency or increase the impedance. could be the whole foam thingy in the cup..

This post has been edited by mADmAN: Jul 23 2007, 03:26 AM

ok boys and girls...done editing...

feel free to give ur comments.. especially wanna hear from those who tested it at the meet.

oh yeah...its my bday today... so wish me happy bday!! im 29 years old now

This post has been edited by mADmAN: Jul 23 2007, 03:16 AM

thanks for the bday wishes guys!

and thanks for the compliments...

@walabies
yeah...my sister got drill...hehehhe...mebbe her husbands wan la..i oso dunno..i just pinjam only...

the mylar i bought from u i never even try it. straight gave my gf. and she loves it. she loves it so much she even allowed me to buy another pair for myself when i jokingly asked her she usually wont lemme spend money on these kinda things wan...kakaka

but i absolutely loved the mylarX3 when i tested it at the meet. plus with the stuff it came with (the case, tips n wrap thingy) its definately bang for buck

@yeah_guyz
only if the DT990 dies on me *hope not la!!! touch wood*.

keep 'em comments coming!

thanks for the wishes guys... im still accepting belated bday wishes today so u can continue wishing me

and stop talking about my DT990 dying pls... *touch wood*

yuheng,
got 2 main reasons i dun wanna do for u...

1/ time... i had to rush this mod like mad.. even got into a big fight with my gf coz i was too bz working and modding and not spending time with her at all

2/ scared i kill ur drivers...same way i killed mine... too scared to take that risk la bro.

i did...u obviously didnt read

its right before the pic of the blue padding.

and..