How would I switch a cab from 4 to 8 ohms?

tiz_1 · #1 07-13-2010, 03:02 PM

I have a Dr Bass 2460D cab I bought last year new. Please spare me the DR Bass drama and issues. I love the cab. Lucky I got it and I doubt I can get help from Dr Bass. Let's move on.

It turned out to be 4 ohms when it was supposed to be 8 ohms. Can I change the existing 12" neo drivers and get it to 8ohms? Which drivers?

Any other ideas on how to get it to 8 ohms?

Anyone have a 2460d/neo in 9.5/10 condition at 8 ohms that they want to swap for a 4 ohm?

--Kevin

dmusic148 · #2 07-13-2010, 03:05 PM

You can't really do it properly, even with a driver swap, because the crossover won't work correctly with a different load. Might sound OK, might not.

BassmanPaul · #3 07-13-2010, 03:14 PM

Why the need for the change??? A four ohm cabinet is suitable for both a SS and a tubr amplifier.

Paul

**yodedude2** · #4 07-13-2010, 03:15 PM

you'd need to change out all the drivers (be sure they spec the same in every way but for resistance) and crossover. not really cost effective. better to try for a swap, or sell the cab and get what your really want. cheers, ron

Quote:

Originally Posted by tiz_1

I have a Dr Bass 2460D cab I bought last year new. Please spare me the DR Bass drama and issues. I love the cab. Lucky I got it and I doubt I can get help from Dr Bass. Let's move on.

It turned out to be 4 ohms when it was supposed to be 8 ohms. Can I change the existing 12" neo drivers and get it to 8ohms? Which drivers?

Any other ideas on how to get it to 8 ohms?

Anyone have a 2460d/neo in 9.5/10 condition at 8 ohms that they want to swap for a 4 ohm?

--Kevin

RickenBoogie · #5 07-13-2010, 04:42 PM

+1, you'd be much better off selling what you have, and buying what you need. Also, +1 to the whole "why" aspect.

Rimshot · #6 07-13-2010, 04:48 PM

My guess as to why...he'd like to run two cabs with a total of 4 ohms rather than one.

What do I win?

Alex1984 · #7 07-13-2010, 04:50 PM

I would suspect he's probably trying to add an extension cab to the set-up while retaining the "modular" aspect of his rig. +1 to trading towards what you need.

D'oh, someone got in before me.

Jaco who? · #8 07-13-2010, 04:52 PM

You'll need to find either a pair of 4Ω speakers to wire in series or a pair of 16Ω speakers to wire in parallel. Chances of finding any 12"s that aren't 8Ω is slim, chances of finding any that match the specs of what you have are pretty much impossible. Sorry, but your choices are sell it, use it by itself, or buy a 2Ω head.

steve_rolfeca · #9 07-13-2010, 05:35 PM

Don't listen to these guys.

Just send me $200.00 in an unmarked brown envelope, and I'll tell you how to suck the extra ohms out of the cabinet with a big needle.

Just like the pros do...

Bigjohn · #10 07-13-2010, 05:54 PM

Put a 4 ohm resistor in series with it

Quote:

Originally Posted by tiz_1

I have a Dr Bass 2460D cab I bought last year new. Please spare me the DR Bass drama and issues. I love the cab. Lucky I got it and I doubt I can get help from Dr Bass. Let's move on.

It turned out to be 4 ohms when it was supposed to be 8 ohms. Can I change the existing 12" neo drivers and get it to 8ohms? Which drivers?

Any other ideas on how to get it to 8 ohms?

Anyone have a 2460d/neo in 9.5/10 condition at 8 ohms that they want to swap for a 4 ohm?

--Kevin

Bofee · #11 07-13-2010, 06:02 PM

Quote:

Originally Posted by Bigjohn

Put a 4 ohm resistor in series with it

A big old 500 Watt resistor bolted to a heatsink with a fan blowing on it.

Bigjohn · #12 07-13-2010, 07:23 PM

Bingo!
8 ohms and double the power handing!

Quote:

Originally Posted by Bofee

A big old 500 Watt resistor bolted to a heatsink with a fan blowing on it.

murphy · #13 07-13-2010, 07:44 PM

Just get the speakers reconed

Bass_Pounder · #14 07-13-2010, 08:02 PM

Quote:

Originally Posted by murphy

Just get the speakers reconed

That does not fix the crossover problem though

tiz_1 · #15 07-14-2010, 06:54 AM

Ok - Rimshot and Alex1984 get the reading-between-the-lines prize. Thanks all for the thoughts and random wild-a**-guesses

.

Another option would be to find a 4ohm replacement for the 112lf (8 ohms now) and not run the amp bridged (run L+R full range or bi-amped). I ran it in bi-amp mode last night and it was fine, and surprisingly not much cooler. Thank doG for the Carvin bx1200's flexibility.

Like I said, I never noticed until I read the sticker and the rig has never presented a problem and gets lots of praise from audience and fellow players.

Are there any suitable 4ohm replacements for the 8ohm eminence 3012lf kappalite neo?

--Kevin

murphy · #16 07-14-2010, 08:41 PM

Quote:

Originally Posted by Bass_Pounder

That does not fix the crossover problem though

I had no problem with the crossover when I have had it done

billfitzmaurice · #17 07-14-2010, 08:55 PM

Quote:

Originally Posted by murphy

I had no problem with the crossover when I have had it done

Then it did not have a crossover, which rolls off the highs in the woofers and rolls off the lows in the tweeter. It must have had only a high pass filter on the tweeter. A true crossover will be AFU with the wrong impedance load.

BassmanPaul · #18 07-15-2010, 11:40 AM

Quote:

Originally Posted by Bigjohn

Bingo!
8 ohms and double the power handing!

And half the audio output!

Paul

dmusic148 · #19 07-15-2010, 11:44 AM

Quote:

Originally Posted by billfitzmaurice

Then it did not have a crossover, which rolls off the highs in the woofers and rolls off the lows in the tweeter. It must have had only a high pass filter on the tweeter. A true crossover will be AFU with the wrong impedance load.

+1, big difference. Lots and lots of cabs have simple high-pass filters, such as practically every two way cab on the market.

Rick Auricchio · #20 07-15-2010, 01:40 PM

Quote:

Originally Posted by tiz_1

Like I said, I never noticed until I read the sticker and the rig has never presented a problem and gets lots of praise from audience and fellow players.

So you're trying to solve a problem that doesn't exist.

Put a piece of tape over the sticker and move on.