Question about Ohms...

KrisWarrington · #1 07-25-2011, 08:39 PM

I have a KUSTOM GROOVE 1200HD which puts out:

1200 Watts @ 2 Ohms
800 Watts @ 4 Ohms
500 Watts @ 8 Ohms

My cabinet is a KUSTOM GROOVE G410H which can handle:

1000 Watts power handling
8 Ohms Impedance

Now I have no idea what this means my question is:

Is this bad for my speaker/head and what does this information mean for me?

billfitzmaurice · #2 07-25-2011, 08:41 PM

AMPS FAQ!! Info on OHMS, Allsize RIGS-OverUnderPowerCabs DIY TechTalk-Links

KrisWarrington · #3 07-25-2011, 08:45 PM

Quote:

Originally Posted by billfitzmaurice

AMPS FAQ!! Info on OHMS, Allsize RIGS-OverUnderPowerCabs DIY TechTalk-Links

Thanks for the response by it really didn't help any, too much technical scientific mumbo jumbo.

BurningSkies · #4 07-25-2011, 08:50 PM

Quote:

Originally Posted by KrisWarrington

Thanks for the response by it really didn't help any, too much technical scientific mumbo jumbo.

Its all mumbo jumbo until you blow up your amp or your cab.

There's a lot of info in that link...worth more time than the quick skim you gave it.

KrisWarrington · #5 07-25-2011, 08:52 PM

Quote:

Originally Posted by BurningSkies

Its all mumbo jumbo until you blow up your amp or your cab.

There's a lot of info in that link...worth more time than the quick skim you gave it.

I thoroughly read Ohms FAQ and I'm still lost.

BurningSkies · #6 07-25-2011, 08:56 PM

Quote:

Originally Posted by KrisWarrington

I thoroughly read Ohms FAQ and I'm still lost.

You're fast. 33 pages in 4 minutes.

Plus here are a whole series of threads listed that compile centuries worth of TB experience on how cabs work...

**B-string** · #7 07-25-2011, 08:56 PM

It all means you can add 1 up to 3 more of your exact same cab.

mikezimmerman · #8 07-25-2011, 08:57 PM

1) You have an 8 ohm cab
2) Your cab can handle up to 1000 watts
3) Your amp puts out 500 watts into 8 ohms, which is way less than 1000 watts, so you don't have to worry about blowing your cab up

See how simple that was?

KrisWarrington · #9 07-25-2011, 08:58 PM

Quote:

Originally Posted by BurningSkies

You're fast. 33 pages in 4 minutes.

Plus here are a whole series of threads listed that compile centuries worth of TB experience on how cabs work...

Well I guess I was just expecting for someone to explain it to me without me having to surf endless web pages to find the answer to one question. That was my fault.

KrisWarrington · #10 07-25-2011, 09:00 PM

Quote:

Originally Posted by mikezimmerman

1) You have an 8 ohm cab
2) Your cab can handle up to 1000 watts
3) Your amp puts out 500 watts into 8 ohms, which is way less than 1000 watts, so you don't have to worry about blowing your cab up

See how simple that was?

So basically my head will only put out what my cab allows for its ohms? unless i daisy them then it put out whatever the impedance rating of those cabs put together is.

KrisWarrington · #11 07-25-2011, 09:03 PM

So using a 250w cab with 8 ohms my head would definately blow it right?

**B-string** · #12 07-25-2011, 09:07 PM

Your amp is SS (Solid State) it will deliver more "power" in watts with a greater load (lower ohms numbers=greater load). The output power from the amp is dependant on the load you attach to it (be that a speaker cab or a light bulb).

**fuzzy beard** · #13 07-25-2011, 09:08 PM

Not if you listen and use your volume knob!

**B-string** · #14 07-25-2011, 09:09 PM

Quote:

Originally Posted by KrisWarrington

So using a 250w cab with 8 ohms my head would definately blow it right?

Most likely if you crank the volume up without cutting the bass off.
Zero volume=zero watts from the amp.

KrisWarrington · #15 07-25-2011, 09:12 PM

Ok because I only use my G410H for live shows. I practice with my DE115 which is 250w @ 8 ohms I never turn my amp above half and my gain is at 1/4 while i play with the DE115, but my 1200HD is also attached to various other things through its effects output like a DBX 215s(EQ) and DBX 166xs(compressor/limiter/noise gate) (just some of my rack effects) I dont know if this affects anything

mikezimmerman · #16 07-25-2011, 09:13 PM

Quote:

Originally Posted by KrisWarrington

So basically my head will only put out what my cab allows for its ohms? unless i daisy them then it put out whatever the impedance rating of those cabs put together is.

Mostly. The power rating on the amp is not a hard limit, just an rough indicator of how much power the amp will put out before it starts distorting past a certain measurable amount. If you really crank it with a bass that's got enough output, you can often get more power out of it, but usually at that point the distortion starts to become audible.

**fuzzy beard** · #17 07-25-2011, 09:15 PM

Why not just use your deep end head for that 115 cab?

KrisWarrington · #18 07-25-2011, 09:16 PM

Yeah my cabs have never distorted, I'm very picky on my volume level. Besides my EQ, compressor and head has clip meters, but i dont know if that tells you your messing up your cab or not. They always stay green.

lokikallas · #19 07-25-2011, 09:16 PM

You can use a 50 watt head with a 1000 watt cabinet. You can use a 1000 watt head with a 50 watt cab. Just don't crank the hell out of either combo and expect good things. Use your ears. When things sound strained turn it down.

**B-string** · #20 07-25-2011, 09:16 PM

Quote:

Originally Posted by KrisWarrington

Ok because I only use my G410H for live shows. I practice with my DE115 which is 250w @ 8 ohms I never turn my amp above half and my gain is at 1/4 while i play with the DE115, but my 1200HD is also attached to various other things through its effects output like a DBX 215s(EQ) and DBX 166xs(compressor/limiter/noise gate) (just some of my rack effects) I dont know if this affects anything

Nope only a sub-harmonic generator or out board eq boosting the bass will.