Same Board Different case?

[travis420 10+ year member]

Crossfire VR4000D 4000 RMS @ 2 Ohms

Clif Designs CDX-20A 3600 RMS @ 2 Ohm (Class X)

MA Audio HK-4000D 3600 RMS @ 1 Ohm (Class X)

Visonik V4000XD 3500RMS @ 2 Ohm

They all have the same excact board

any opinons on which is louder or the same as they say?? thanks

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[brtnboarder3241 5,000+ posts]

didnt know that amps produced noise?

 

[kovemaster559 5,000+ posts]

didnt know that amps produced noise?

do they realy.