Advice needed

[Bungo Mike]

So I’m wanting to buy this cab to sit on top of my Ampeg SVT15e (8ohm) but it’s 4ohm. Can I re wire this to 8ohm so I can use it with my 4ohm head. Thanks 

[BassmanPaul]

Most likely two 8Ω drivers wired in parallel. The best you cab do is wire them in series for 16Ω.

[itu]

1) No. 

2) Yes... partially.

 

1) 4 ohms here equals 2x8 ohms in parallel. If you wire them in series, you get a 16 ohm speaker. You could try this. You decide whether the divided power is enough for you.

 

A 300 W amp pushes 100 W (1/3 of the total power) to the 16 ohm cab, and 200 W to the 8 ohm cab. Depending on the sensitivities of the speakers, the loudness of each cab may be whatever.

 

 

2) If you use one element only, you have an 8 ohm speaker. 

 

It would be feasible to replace the other element with a wooden plate. Otherwise the element with no connection would be a spring like component in the system. That would raise the lowest reproducible frequency (think it like the cab would have a leak).

 

 

Note:

The reason for the parallel connection (in cabs that include more than one element) is that if one element burns, there's still the other(s) left. A very good feature if you have a valve/tube amp because it always needs a load of some kind.