? on using Gain Tutorial on Alpine PDX amps...

[Rochambeau 10+ year member]

I posted this originally in the Gain Tutorial thread but I think it got lost in there so I putting it out here in the open.

OK, I am gonna need some help on this. Because of the design of the amps, I am unsure if they follow the same basic formula as outlined in the gain setting tutorial.

The amps are Alpine PDX and what confuses me is that they are rated at the same power regardless of the impedance of the speakers. Therefore, should I use the same formulas?

Using the forumulas as stated here is what I got (wattage gleaned from birthsheets):

PDX 4.150 bridged into 3ohm Boston Z6's: sqrt(3*318)=30.88v

PDX 2.150 into 4ohm Boston SL-80's: sqrt(4*171)=26.15v

PDX 1.1000 into 2 Boston GL512-44's (dual 4ohm voice coils, each sub wired at 8ohms): sqrt(4*1124)=67.05v

Does all this hold up considering the design of the amps?

Thanks a bunch.

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[squeak9798 5,000+ posts]

Therefore, should I use the same formulas?

Yes.

The amplifiers do not defy the laws of physics. Hence they must abide by Ohms Law, which is all that formula is.

 

[Rochambeau 10+ year member]

ty very much.

 

[rc10mike 10+ year member]

Old thread I know, but should PDX's have speakers hooked up while setting the gain?

 

[Worlddre 5,000+ posts]

nope just plug the speaker connectors in