I useed my Matrix very rarely from 2 year to now because was too arsh for mee. I prefer my little dot or lake people or my rega ear...but reading in internet the possibility of replace the amp chip for better resultI bought a normal LM4562NA Amplificateur Operationnel TEXAS INSTRUMENTS for 9€ shipment included. 3 minutes to replace the original one end NOW.....a miracle. Everything go right and musically correct. I tested wiyh my hd600 and HIFIman he400i .....supeb with the max gain to +12db. The next day I'll try with my Grado sr325i and dt990 and...

For my taste are too analitical cans.I try to remove the  high frequencies sibiling using several different tips...shure triple  compy foam....nothing they remain too harsh for my tasty. I also try using Little dot I+ and 30ohm resistore...They have no musicality ...better Titan 1 or Beyerdynamic 102

I buy this little amp for drive my grad sr60....quite good, but nothing special until..... ..until I change the valve in my other littla amp "Bravo audio" with single balance e88cc chine yube with a good tesla one glod series. Yhe sound change impressively, so I tried to change the biggermouth A1 ones too. I bought 2  6j5P tesla for ca. 5€ and simply replace the old ones...    In the meantime I upgraded my Grado with a wonderful sr325i  and the combination is something magic. Bass are smooth and deeper the scene open and very "musical". I can not...

I buy a pair of Fidelio M1 in Amazon for sale (70% discount) after reading some disagriment reviews. I just own some good headphones (hd880 600ohm hd990 pro 250ohm, grado sr60, yuin pk1-2-3, rockit sound r50 , and others) and I use ipod 5 amped with fiio 12 and fron 1 month now the wonderful Fiio X3. For 69€ M1 is a great purchase, the leather arc with the well done pads. This ones are very confortable too. They are in memory foam and this simply idea is so brillant, they fit perfectly to your ear end allow perfect solid end firmy bass, in addition...