Alpine @ 8 ohms

[Jay Mack 10+ year member]

I have an Alpine MRV-T757 that I'm going to use to power two 4 ohm, 12" Alpine subs. The amp is rated as fiollows, at 14.4 volts:

two channels at 4 ohms = 100 watts per channel;

two channels at 2 ohms= 200 watts per channel;

bridged at 4 ohms = 400 watts.

Now, what I'm going to do is wire in series (8 ohms) and bridge. What power do you think the amp will produce? 400 watts?

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[CL1CKCLACK 5,000+ posts]

are the subs dual 4s or single 4s?

 

[Bassin Buick]

yes. its still a 4 ohm load. lol

 

[Villeza1 10+ year member]

You're still getting 400 watts regardless. Wired parallel 200 x 2 @ 2 ohm vs. wired series (bridged) 400 x 1 @ 4 ohm. It's still 400 watts. Just wire the subs parallel to both channels.

 

[CL1CKCLACK 5,000+ posts]

You're still getting 400 watts regardless. Wired parallel 200 x 2 @ 2 ohm vs. wired series (bridged) 400 x 1 @ 4 ohm. It's still 400 watts. Just wire the subs parallel to both channels.

did you read? hed be running them at 8 ohms, not 4 ohms bridged

 

[Rich B 5,000+ posts]

I have an Alpine MRV-T757 that I'm going to use to power two 4 ohm, 12" Alpine subs. The amp is rated as fiollows, at 14.4 volts:
two channels at 4 ohms = 100 watts per channel;

two channels at 2 ohms= 200 watts per channel;

bridged at 4 ohms = 400 watts.

Now, what I'm going to do is wire in series (8 ohms) and bridge. What power do you think the amp will produce? 400 watts?

8ohms bridged would be the same total power as 2 x 4ohms (100w x 2), so 200w.

 

[sobe3yourself. 10+ year member]

~290 watts

 

[Villeza1 10+ year member]

EDIT: nm, is see what you're saying

 

[CL1CKCLACK 5,000+ posts]

EDIT: nm, is see what you're saying

lol how do you wire 2 s4s to 4 ohms??? am i missing something...

 

[Bassin Buick]

i totally misread the OP's post. i thought he said wire 2 8 ohm speakers in bridged mode. facepalm for me. LOL

 

[Jay Mack 10+ year member]

The guy at Alpine says by doing it that way I'm back to 100 watts per sub, which I'm not sure I believe. He says it's way too little for the subs, which are Alpine SWE 1243s rated at 100 -250 watts. He made me go out and order a M500.1, which is made for those subs and which I did order just now from Crutchfield for $179.00. So, thanks alot.

 

[dragnix 5,000+ posts]

You got ordered around by a tech at alpine?

 

[Jay Mack 10+ year member]

You got ordered around by a tech at alpine?

He had me goose stepping all around the office. If I'd a known that was the deal, I'd a probably gone with Kicker CVRs and the ZX750 to begin with.