Help: running two cabs when there aren't enough sockets......?

[Hellzero]

Here are the very useful Neutrik Speakon/Jack combo sockets: https://www.thomann.co.uk/neutrik_nlj2mdxx_v.htm

[Beedster]

1 minute ago, Hellzero said:

Here are the very useful Neutrik Speakon/Jack combo sockets: https://www.thomann.co.uk/neutrik_nlj2mdxx_v.htm

Thanks Tony 🙏

[Steve Browning]

4 hours ago, Beedster said:

 

I'd be far happier if that cab splitter box was Speakon..... 🤔

I have one of the old OBBM ones that I've had for years and not even used. You are wecome to it, if you wish. Free, gratis and for nothing, as my late father would have said.

[Steve Browning]

It says it's a serialiser on the case. Does that make it unsuitable? It may make two 8 ohm cabs = 16 ohms (or am I wrong)?

[Beedster]

32 minutes ago, Steve Browning said:

I have one of the old OBBM ones that I've had for years and not even used. You are wecome to it, if you wish. Free, gratis and for nothing, as my late father would have said.

 

Steve, as ever you're a star mate, perhaps @obbm can confirm?

[obbm]

54 minutes ago, Beedster said:

 

Steve, as ever you're a star mate, perhaps @obbm can confirm?

Sorry for delayed response but away at the moment.  Steve is correct. It will make 2 x 8-ohm cabs look like  16-ohms and because it’s a valve head you will get full output into the 16-ohms.

[Beedster]

6 minutes ago, obbm said:

Sorry for delayed response but away at the moment.  Steve is correct. It will make 2 x 8-ohm cabs look like  16-ohms and because it’s a valve head you will get full output into the 16-ohms.

 

Many thanks (30-mins is hardly a delay!). I'm guessing that's inadvisable with two different cabs as per the above post, the cabs in question are both 8 ohm, one a 15" only, the other a 10" and two 6"s? 

[obbm]

3 minutes ago, Beedster said:

 

Many thanks (30-mins is hardly a delay!). I'm guessing that's inadvisable with two different cabs as per the above post, the cabs in question are both 8 ohm, one a 15" only, the other a 10" and two 6"s? 

If you get it from Steve and send it to me I could rewire it to parallel. FOC of course.

Edited May 28 by obbm

[Beedster]

1 minute ago, obbm said:

If you get it from Steve and send it to me I could rewire it to parallel. FOC of course.

 

Wow it's a great day to be on this forum, many thanks, I'll do that, I'd far rather have a unit built by your good self 🙏

[obbm]

1 minute ago, Beedster said:

 

Wow it's a great day to be on this forum, many thanks, I'll do that, I'd far rather have a unit built by your good self 🙏

I’ll pm you my address later.

[Beedster]

12 minutes ago, obbm said:

I’ll pm you my address later.

Many thanks to you and Steve 🙏

[obbm]

Perhaps Steve could send it straight to me to save time/postage.

Edited May 28 by obbm

[Steve Browning]

19 hours ago, obbm said:

Perhaps Steve could send it straight to me to save time/postage.

 

It's on its way West!!

[nekomatic]

22 hours ago, Beedster said:

 

Thanks, not doubting your word but I'd be interesting in understanding why?

As @itu says, the impedance of each cab is highly dependent on frequency so both the distribution of power and the total output of both cabs will vary in  ways that are hard to predict. For example at one cab’s resonance frequency it will have a high impedance, so the other cab will output hardly anything at that frequency. 

[Beedster]

19 hours ago, obbm said:

Perhaps Steve could send it straight to me to save time/postage.

 

39 minutes ago, Steve Browning said:

 

It's on its way West!!

 

Steve @Steve Browning and Dave @obbm, thank you so much 🙏

[agedhorse]

Why not a simple splitter Y cable?

 

 

Edited May 31 by agedhorse

[Beedster]

On 31/05/2025 at 19:53, agedhorse said:

Why not a simple splitter Y cable?

 

 

I suspect the box does the same thing albeit with the advantage of being able to cope with both speakon and jack cables in a number of combinations 👍

[Beedster]

With thanks to Steve @Steve Browning for donating the box and Dave @obbm for modifying it this is now solved, I've just run it at low volume at home and it works just fine, looking forward to running it slightly louder tomorrow in the big room 👍 

[Steve Browning]

Excellent news. Always glad to be able to help. 🙂