Bass amp opamp tweaking

[bob p]

I've done blind tests with HiFi guys and none of them could tell the OPA opamps apart in double blinded experiments because HiFi guys don't know what to listen for. But I still use the OPA because they do provide objective measurable improvements in noise, even if the end user can't put their finger on it. My first OPA deployment was in a project where I upgraded boutique HiFi preamps to provide balanced line drivers. I got much better CMRR with them.

If you're registered with TI as a designer you can get samples. They restrict you to 5 samples per product. When I made the decision to buy I bought them from the list of official distributors that TI provided. They're the usual suspects -- distributors that guarantee a certificate of provenance if you ask for it:

https://www.ti.com/lsds/ti/store/distributors.page

for me it's Newark because I'm local so I get UPS Ground shipments overnight.

[Leo_Gnardo]

Digikey. I don't trust any sellers on ebay not even the US ones

Thanks! And I believe you're right to avoid ebay electronics parts, too many counterfeits.