Thoughts on Box Rise and Minimum Impedence of an Amplifier

[bigblank69 10+ year member]

Ok, curious on what your opinions on box rise and minimum impedance of an amp. I'm redoing my audio system of my boat, and I THOUGHT I had bought a Dual 4 ohm Gen 1 FU750, and apparently that's not the case as I measured it as a Dual 2 ohm today on my new Multi. Normally not a problem, but I bought a Kicker KXM1200 to run it off when I thought it was a dual 4, and that amp is 2 ohm stable.

I have had this set up running together before in my bench test area, and the minimum impedance I ever got down with the box rise was 1.8ohms. I'm thinking I'm going to be ok running this, as I had this this set up running before (Granted for short periods of time, and never got overly warm).

Anyone have any differing opinions?

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[BOOMINGRANDPA 5,000+ posts]

Ok, curious on what your opinions on box rise and minimum impedance of an amp. I'm redoing my audio system of my boat, and I THOUGHT I had bought a Dual 4 ohm Gen 1 FU750, and apparently that's not the case as I measured it as a Dual 2 ohm today on my new Multi. Normally not a problem, but I bought a Kicker KXM1200 to run it off when I thought it was a dual 4, and that amp is 2 ohm stable.
I have had this set up running together before in my bench test area, and the minimum impedance I ever got down with the box rise was 1.8ohms. I'm thinking I'm going to be ok running this, as I had this this set up running before (Granted for short periods of time, and never got overly warm).

Anyone have any differing opinions?

trade u my ppi for your kicker we'll both have correct ohm and power then...

 

[bigblank69 10+ year member]

Kicker is going in my boat, I would prefer marine rated. I have a ton of one ohm amps, but none a marine rated.

 

[Boomin_tahoe 5,000+ posts]

Gramps...those marine amps are more than you can afford. Even me. They are $$.

 

[BOOMINGRANDPA 5,000+ posts]

Gramps...those marine amps are more than you can afford. Even me. They are $$.

he's selling it for $190

 

[Boomin_tahoe 5,000+ posts]

he's selling it for $190

I was specifically talking about all marine amps, not just that one. That one retailed for 800, he bought it for either 150 or 200....don't recall which.

 

[bigblank69 10+ year member]

I was specifically talking about all marine amps, not just that one. That one retailed for 800, he bought it for either 150 or 200....don't recall which.

I paid $199

I bought a pair of the 2 channel marines for $150 each

My preference is to keep the amp... But If I can't use the FU's my whole plan gets F'd up...

 

[Boomin_tahoe 5,000+ posts]

I paid $199
I bought a pair of the 2 channel marines for $150 each

My preference is to keep the amp... But If I can't use the FU's my whole plan gets F'd up...

Am I smoking crack? Swear I saw somewhere in one of your vids that the amp retailed for 800...?

 

[BOOMINGRANDPA 5,000+ posts]

Am I smoking crack? Swear I saw somewhere in one of your vids that the amp retailed for 800...?

i saw one very similar thats like $769 his is more like $279..

 

[tymoto21 10+ year member]

I've never done below rated ohm on a kicker but I would run it

Don't drop voltage too low set gain right

 

[hispls 5,000+ posts]

I ran the old KX series at 1 ohm and they protected here and there but didn't blow up. That said what you're doing is not safe or Kicker would rate them to 1 ohm. If you can't afford to blow up that amp stick to 4 ohm until you can come up with another plan.

 

[bigblank69 10+ year member]

It does, they are on close out because the new series came out

 

[bigblank69 10+ year member]

I ran the old KX series at 1 ohm and they protected here and there but didn't blow up. That said what you're doing is not safe or Kicker would rate them to 1 ohm. If you can't afford to blow up that amp stick to 4 ohm until you can come up with another plan.

I know... This just blows up my whole plan... I knew something was up before when I dyno'd on the sub and was reading 1.8..but I thought it was just a drop to the right freq... Half tempted to just recone this one with a dual 4 vc... Damnit

Marine rated amps over 1k are few and far between, and even fewer are 1ohm rated...

 

[YukonXL04]

What kind of boat? And where are the amps being mounted? I have been using car amps on boats for years. Got a old free logic POS amp in my uncle's boat for the past 8 years.

While I understand wanting a marine amp, just wanted to know the details

 

[hispls 5,000+ posts]

I know... This just blows up my whole plan... I knew something was up before when I dyno'd on the sub and was reading 1.8..but I thought it was just a drop to the right freq... Half tempted to just recone this one with a dual 4 vc... Damnit
Marine rated amps over 1k are few and far between, and even fewer are 1ohm rated...

Can you add a second sub or swap the sub with someone on here? I hate tearing down perfectly good woofers.