4 ohm Bass head on two 8ohm cabs?

[Rip Van Dan]

Please read the rest of the thread before you give OP advice that will ruin his amp. OP wrongly assumed he had 2 8ohm cabs. He has a combo that IS putting out a 4 ohm load, and asked about connected an 8 ohm cab to it. This will not work.

Guilty to not reading it all first. Now, did you read the very next post I made about 30-seconds after the first? It's underneath the first one. It addresses your concern. Also notice on the first that I was explaining that his connections were parallel and specified two 8 ohm cabinets in the example of my first remarks. I'll go pull the "hook 'em up" remark out of that first one since that would not work out well for the OP.

Thanks for watching out for us..

 

[CL400Peavey]

BassPunnisher420, unless the output on the back or your cab says it is a series output, that is a parallel output and two 8 ohm cabinets hooked up to your amp by "daisy-chaining" them will put a 4 ohm load on your amp, which is perfect. Same thing if you plug both cabs into the back of your amp. Those connections are all parallel connections unless marked otherwise. It's the industry standard.

So hook 'em up and Rock on!

This would be correct if he had two 8 Ohm cabs. He does not.

If your internal speaker on your combo is 4 ohms, check in the manual to see if you can bypass it. Running a 4 ohm speaker load from your combo and adding another 8 ohm speaker cabinet to it will roast your amp. If you can bypass the internal speaker, get a single 4 ohm 410 cab or two 8 ohm cabs to get the most from your set-up.

You can also get a series/parallel switch box to hook them up in series, which will then put a 12 ohm load on it. It will be very safe and your amp might never get above warm using it that way because it will put out a lot less power. However, the additional speaker area from the 410 should more than compensate for it. I ran a 212 and 115 cab that way for a while. Not the best solution but better than just the speaker in the combo I had.

It would be fine running his amp at 12 Ohms, but wouldn't benefit him in any way volume wise.

 

[Rip Van Dan]

This would be correct if he had two 8 Ohm cabs. He does not.

You are absolutely right!

It would be fine running his amp at 12 Ohms, but wouldn't benefit him in any way volume wise.

Actually it does. Been there, done that. Would you like the t-shirt? (meant in jest not as an insult). I ran a 212 and a 115 with a series connection which put the ohms load up to 12 ohms. Even with the reduced power (came out to about 85 watts) this was still louder and better sounding than the 115.

 

[S-Bigbottom]

If you can bypass the internal speaker, get a single 4 ohm 410 cab

This is what his combo is, a 4 ohm 4x10. He was asking about adding another 4x10.

 

[CL400Peavey]

Actually it does. Been there, done that. Would you like the t-shirt? (meant in jest not as an insult). I ran a 212 and a 115 with a series connection which put the ohms load up to 12 ohms. Even with the reduced power (came out to about 85 watts) this was still louder and better sounding than the 115.

Agree to disagree. What you add in sensitivity is taken away by the power lost with a SS amp.

 

[Rip Van Dan]

Agree to disagree. What you add in sensitivity is taken away by the power lost with a SS amp.

OK. Even though it took it down to ~85 watts for the combination of cabs from the 125 watts into the 115, it still sounded louder and better to me and the group was much happier with the sound. So we agree to disagree.

I would have just used the 212 instead of the 115 if I could have, but the 212 was a 4 ohm cab and the amp had a minimum 8 ohm load rating.

 

[Rip Van Dan]

This is what his combo is, a 4 ohm 4x10. He was asking about adding another 4x10.

And I thought I read the entire string....I'll be quiet now...

 

[Coolhandjjl]

To the late comers: The OP mistakenly assumed that the built-in cab was identical to the standalone 8‎Ω vx410. It is not. The built-in cab is a 4Ω 410, and the amp is rated at 4‎Ω minimum.

 

[Kukulkan61]

Just do it and see what happens...

 

[/\/\3phist0]

Just do it and see what happens...

BOOO fireworks are only cool on July 4th.

 

[madjazzbass]

Once again, OHM - I - GOD!!, Haaaa!!!

 

[Haji]

Here's the simple solution: since you already got a deal on a separate 410 cab, grab another used 410 cab (they're everywhere) and then grab a used Hartke head (they too are everywhere). Sell that Behringer and the combo if you're not gonna use it anymore and you're good to go. Hartke cabinets (which I have a pair of and like very much) for whatever reason just don't hold their value and can be had CHEAP.

 

[pudgychef]

awesome thread

 

[InhumanResource]

Here's the simple solution: since you already got a deal on a separate 410 cab, grab another used 410 cab (they're everywhere) and then grab a used Hartke head (they too are everywhere). Sell that Behringer and the combo if you're not gonna use it anymore and you're good to go. Hartke cabinets (which I have a pair of and like very much) for whatever reason just don't hold their value and can be had CHEAP.

Yup. The combo is the problem. Dump it and buy gear that allows the configuration you want.

 

[Josh Kneisel]

Actually, no. The internal 410 has a 4 ohm impedance. The external 410 is an 8 ohm cab. 4 + 8 = 2.67 ohms.

I read his post as saying he wanted to power two 8ohm cabs. Two 8 ohm cabs chained would be 4 ohms. I may have misread.

 

[Josh Kneisel]

I read his post as saying he wanted to power two 8ohm cabs. Two 8 ohm cabs chained would be 4 ohms. I may have misread.

I didn't realize he was trying to power with a combo. I never use combos so I didn't even think about it

 

[S-Bigbottom]

I read his post as saying he wanted to power two 8ohm cabs. Two 8 ohm cabs chained would be 4 ohms. I may have misread.

This is correct, but you did not finish reading the Thread.

I didn't realize he was trying to power with a combo. I never use combos so I didn't even think about it

This is for everyone reading, not just you.

The first post is usually what the person "Thinks" they have. Later you may find out that they have something different then they "Thought", and when answering just the OP without reading ahead it can result in amp failure.
This is why it is critical to read all and understand exactly what the OP has before giving advice in the Amps section.