infinity amps

[TWhitesideLL07 10+ year member]

I am looking into the 4 channel infinity amps and i came across a problem. the amp is listed as infinity reference 7540a but some stores advertise it as 7541a...does anyone know the diff

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[EricM 10+ year member]

All their amps went up by 1 in the model # like that. The newer models have different terminal blocks, and Infinity says they have revised input gain circuitry. The older models seem to be $100-$150 cheaper.