Originally Posted by Howard Johnstone
Indeed, They are very good value for money but:
Important improvements can easily be made:
1) Remove the backplate and change the uA4558 (2x741 type opamp)
to NE5532 or eq. (Great improvement in overall sound quality resolution)
2) Increase the capacitance of the two cheap capacitors by, exchange
(best) or by adding another 2200uF/35VDC on the solder side.
The capacitors are small and of poor quality (high impedance)
Low impedance, 4700uF/35VDC will fit nicely
Suddenly, you have a couple of Fostex "copies"
Hello there..I got 4558C, TL022CP, LM308AN and NE555CDP among my electronic part trash-bin
, may i use any of them for the opamp or shall i buy one of them,which u've mentioned? And also, what's the values of those "crappy" capacitors, which should be changed?
And also i have a plan to use my Creative 4+1 4400's Sub Bass with these speakers to compensate the lackness of low-ends, yet i don't know the exact frequency ranges of both these speakers and the sub. Anyone tried such a thing ?