adding four 1 ohm resistors to sub to higher the ohms?

[myjaja 10+ year member]

Okay, so I have an mb quart amp that gives out 1200 watts rms at 1 ohm. I have a 12" pioneer 3500 (1000wrms) sub connected to it. Its a dual 2 wired at 1 ohm. But the thing is, with this sub, theyre actually dual 1.5 ohms. So its really .75 ohm parallel. Which is making my amp go into protection. Can I add four 1 ohm, 10 watt resistors connected at parallel which will go down to .25 ohms and added on to the sub, which will make it 1 ohm total. Would that work?

thanks

Click to read more...

 

[Bassin Buick]

how's your electrical in the car? that amp should do just fine with that load because almost all speakers are as you described. sounds like you arent sending enough power to the amp

 

[myjaja 10+ year member]

It doesnt go below 12.4 votts. But Ive been told that the mb quart amp should play from around 11-15.5 votts. So I have no clue why it goes into protection other than it being at .75 ohms.

 

[CHEMMINS 10+ year member]

Try wiring it to 3 ohms and see if it still goes into protect.

 

[myjaja 10+ year member]

Try wiring it to 3 ohms and see if it still goes into protect.

it doesnt..

 

[winkychevelle 10+ year member]

10 watt resistors won't hold 1200 watts which is the reason they arent recommended for use to change ohm loads by well anyone

 

[kr15 5,000+ posts]

Honestly, i think this is a lack of power issue...I think your electrical cant hold a .75 ohm load on an amp, not the amp itself. MBQ makes a decent product, and that .75 probley rises to at least 2....for my money, your electrical cant support it

meaning, i think that amp WOULD do .75 if you had stouter electrical

 

[winkychevelle 10+ year member]

I agree on the electrical issues does the amp Instantly go into protect or plays then goes Into protect

 

[helotaxi 5,000+ posts]

But the thing is, with this sub, theyre actually dual 1.5 ohms. So its really .75 ohm parallel.

How did you determine this?

 

[myjaja 10+ year member]

It plays fine until I turn up the radio then it goes into protecton. So I turn off the radio and then turn it back on, and the amp goes back to normal instantly.

 

[myjaja 10+ year member]

It says it has a dual 1.5 voice coil in the manual.

 

[helotaxi 5,000+ posts]

It says it has a dual 1.5 voice coil in the manual.

This was in the REVC column, yes? That is the DC resistance of the coils, not the impedance. The amp will never see the RE value with an AC signal like music or tones. It is an electrical property of the voicecoil that really doesn't mean anything for your purposes.

Almost certainly the problem is with your wiring as previously mentioned. Based on how you're describing the amp's behavior, you are either using too small of a power wire, have a bad ground or have a bad connection somewhere in the wiring. As you increase the power output of the amp, it must draw more current. As more current flows through that bad connection it causes the voltage to drop. Once the voltage gets below a certain point, the amp's protection circuit kicks in to keep you from smoking the amp.

The answer to your problem is to fix your wiring.

 

[Haunz 10+ year member]

^I'd tend to agree.. You can try putting a voltmeter at the amp.. if the voltage isnt dropping below 12V then that shouldn't be the problem..

Other possibilites include shorting speaker wire or tinsel leads.. (not sure how they are laid out on that sub).. or there is also a possibility there is something wrong with the amp..

 

[Phoenix Risen 10+ year member]

im going to ask a question that should have been the first thing on ppls minds,

what exact amp and sub are your running?

 

[IMOVeCHICKENS! 10+ year member]

im going to ask a question that should have been the first thing on ppls minds,
what exact amp and sub are your running?

reading> you for real...........