4ohm sub reading 4.6

[king ranch 5,000+ posts]

just wondering i have a 08 12" l7 dual 2ohm wired up to 4ohm and the dmm is reading 4.6ohms and the other sub is reading 4.3 just wondering why the one is off .3ohms

i know resistance but on my dmm its only about .3 to .4 so why still the difference on the one sub

thanks

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[RAM_Designs 5,000+ posts]

the ohm load of each coil will differ slightly, so .3-.4 from one sub to another, especially with DVC subs, is no big deal.

 

[theblizzard2025 10+ year member]

"nominal" readings....

 

[2wheeler 10+ year member]

Send the subs back and get a matched set. Otherwise they will fight each other.

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j/k...

 

[GAM3OVR 5,000+ posts]

Send the subs back and get a matched set. Otherwise they will fight each other.
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j/k...

OOOO, those are always fun.

 

[2wheeler 10+ year member]

I wouldn't run L5s/L7s unless they were within .0005 ohms of each other.

 

[king ranch 5,000+ posts]

really ok i will sell them to your for 800 shipped

 

[audioarsonal 10+ year member]

Most of the time your DMM will give a .2-.4 reading of resistance.

 

[SPL Blazer 10+ year member]

Consider yourself lucky if you can find a pair of commercially available subs with the exact same coil resistance readings. My Fi's are each slightly off. But not by any huge margin so they still do the job they were bought for. Unless your building your own subs it's going to be hard to match the coil resistances to each other. You could try sending one sub back and telling them you want one with a specific ohm reading, but I'd be willing to bet they wouldn't do it. They'd have to open up a bunch of different subs to find one that was either very close or exact, then they're left with a bunch of open box subs that they might not be able to sell as "New", so your better off just keeping what you have and pay no attention to it.

 

[2wheeler 10+ year member]

I thought my sarcasm was obvious...

Just having some fun here. I can't imagine .3 ohms difference being a problem. Except to serious competitors or the overly anal...

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[king ranch 5,000+ posts]

i was being sarcastic as well bout the 800 shipped haha

 

[2wheeler 10+ year member]

really ok i will sell them to your for 800 shipped

If I was being serious about the .0005 ohm difference, (I was not..) why would I want your poorly matched subs? They would have terrible square wave cancellation issues...

J/K!!

Edit:

Posting at the same time....FTL

 

[king ranch 5,000+ posts]

hey what would u recommend for power on a set of polk momo comps 6.5's

they are rated for 125rms whats the most power i can safely give them they are only 3 weeks old btw

 

[2wheeler 10+ year member]

Keep turning up the gains until they blow. Turn the gains down just a bit and get new speakers. 100% accurate method, but it can be expensive..

Or just turn them up until they sound good and you're not clipping them. I'm far from a pro at audio, but I can hear speakers being clipped/killed. I think its one of those "you'll know it when you hear it" kinda things.

 

[SPL Blazer 10+ year member]

Keep turning up the gains until they blow. Turn the gains down just a bit and get new speakers. 100% accurate method, but it can be expensive..

Or just turn them up until they sound good and you're not clipping them. I'm far from a pro at audio, but I can hear speakers being clipped/killed. I think its one of those "you'll know it when you hear it" kinda things.

Don't listen to sarcastic remarks like this one. Have someone with a DMM or an O scope set the gains for you. I seriously doubt anyone that doesn't do this daily will be able to hear the difference between clipping and not clipping. Check out this little video on gain setting.

Gain setting video