Altec Lansing MX5021 Modification (Part 2)

Change the op-amp, in order to change its sound characteristic and lower SNR.

OPA2111KP and OPA2107AP.


Tried LM4562, LME49720HA, LME49720NA, OPA2107AP, OPA2111KP, OPA2132PA, OPA2277PA, LT1364, LT1352, LT1057 and....

End up using OPA2111KP because it sounds more natural.

LME49720HA

Top View Diagram(single opamp)
Just bend its leg to DIP-8 according to the number then fit into DIP-8 socket.

Finally got the decent capacitor for audio. Nichicon Fine Gold.

Another re-cap plan(same as the part 1, just going to change better capacitor).

Finally replaced with better quality audio grade capacitor and op-amp with semi-gold plated 8DIP socket.
Nichicon Fine Gold series and Nichicon BP(Bi-polar).
Texas Instruments OPA2111KP.

C36 decoupling capacitor for ALL of the Op-Amps and IC.
Replace with 100uF to 470uF.(the higher the better)
Add(optional) 0.1uF MKP across the capacitor at the bottom of PCB for better performance.

Four C2/C7/C99/C100 green decoupling capacitor for both chip amplifiers.
Replace with 0.1uF MKP or MKT capacitor.(note the spacing of lead)

C9 feedback capacitor of subwoofer's chip amplifier.
Replace with good capacitor eg. Nichicon Fine Gold. 47uF will do.

Conclusion:
Smoother sound overall.

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