AIYIMA A03 - OP AMP Change

[Joseph1]

I owned an AIYIMA A03 amp. I feel like the BASS is not enough for me. I tested from its left & right channels (not using subwoofers).
Supply voltage is 19V/4.7A.

At first I thought it was due to my speakers, but after I have tested with many bookshelf speakers, but the BASS is not punchy (shake level) even I turn the BASS knob to its maximum.

The only thing I can do is to replace its NE5532 OPAMPs & see. Many OPA Audio opamps are discontinued & the only one I can find is LM4562, but it is half the price of the complete AMP.

Will I get a noticeable BASS Boost after replacing these OPAMPS? Or should I go with AIYIMA A07 Pro which has TPA3255?

Thanks

 

[JSmith]

AIYIMA A03

Well the A05 which uses the TPA3221 showed a rolled off frequency response from around 80Hz down;

However the A03 uses the TPA3116... maybe it has the same or worse roll off.

Don't bother with op-amp rolling... get an amp that doesn't show this issue though if you wish.

Or should I go with AIYIMA A07 Pro which has TPA3255?

Well at least it doesn't have that bass roll off;

Aiyima A07 Pro Amplifier Review

This is a review and detailed measurements of the AIYIMA A07 Pro stereo amplifier. It was kindly drop shipped to me by a member and costs about $90. As you see the distinguishing factor from some of the other Aiyima amplifiers is inclusion of tone controls. Alas, that is also where the problem...

www.audiosciencereview.com

You may wish to take a look at this TPA3255 based amp;

Fosi Audio V3 Amplifier Review

This is a review and detailed measurements of the Fosi Audio V3 stereo amplifier. It was sent to me by the company and costs US $89.99 with stock 32 volt supply. Price goes up to $109.99 with the 48 volt supply. There is a $10 discount coupon right now. Despite its budget price, the V3...

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Oh and welcome to ASR.


JSmith

 

[LTig]

Will I get a noticeable BASS Boost after replacing these OPAMPS?

Changing opamps has no effect on frequency response in the bass, and in the treble only for broken designs (chose of inappropriate opamp with not enough gain) which is very unlikely.

 

[Joseph1]

Well at least it doesn't have that bass roll off;

JSmith

Many thanks for the detail review. Well spot on the frequency response graph. Looks likes that's the issue with A03 (below 80Hz starts to roll off).I'll compare with my A07 Pro, it will arrive on this weekend.

Many Thanks.