adding extension cab

[jw54]

I am looking to add a 15" extension cab to my Carlsbro Viper 250 combo but there is not speaker output.

The outputs I have are:

DI (1/4 " jack on front)
Line out
(Active) send & return
Bi-amp Hi out & Lo out with frequency selector (200, 400, 1.5K & 2K)

Can I connect the speaker to any of these?

There is no indication what the impedence of the internal 15" Eminence speaker is.

Thanks for any help offered.

[Guest MoJo]

Simple answer is no.

If you really want to add an extension cab, it may be possible but primarily it depends on two factors which you [b]would[/b] have to know

[list=1]
[*]The minimum impedance load of your amplifier (usually 8 or 4 ohms)
[*]The impedance of the internal driver (usually labelled on the driver)
[/list]

Obviously if the amp works with a minimum 8 ohm impedance and the internal driver is 8 ohm, connecting another cab in parallel could cause damage to your amp. If your amp works with a minimum of 4 ohms and the driver is 8 ohms then you can add an additional 8 ohm cab in parallel. To do this you would have to get access to the rear of your driver (usually have to remove the driver for this) and attach on two extension cables to the + and - terminals of your driver. You will then have to drill a hole in the rear panel of your cabinet to take an extension socket (either 1/4 inch jack or speakon more commonly) and attach the two extension cables to the socket. It is important that the connections to the socket are the same as the connections in your extesion cab + to + and - to - or you will end up with the two cabs 'out of phase' with each other.

As I said, it may be possible but involves a fair bit of work so you have to decide whether it's worth it.

The other option would be to get a power amp and cabinet and feed them from your line out or bi-amp output sockets depending on what you wanted to achieve

Edited February 23, 2009 by bassman2790

[jw54]

Thanks for the info.

This has saved me some time and money!

Cheers
[quote name='bassman2790' post='417280' date='Feb 23 2009, 11:46 AM']Simple answer is no.

If you really want to add an extension cab, it may be possible but primarily it depends on two factors which you [b]would[/b] have to know

[list=1]
[*]The minimum impedance load of your amplifier (usually 8 or 4 ohms)
[*]The impedance of the internal driver (usually labelled on the driver)
[/list]

Obviously if the amp works with a minimum 8 ohm impedance and the internal driver is 8 ohm, connecting another cab in parallel could cause damage to your amp. If your amp works with a minimum of 4 ohms and the driver is 8 ohms then you can add an additional 8 ohm cab in parallel. To do this you would have to get access to the rear of your driver (usually have to remove the driver for this) and attach on two extension cables to the + and - terminals of your driver. You will then have to drill a hole in the rear panel of your cabinet to take an extension socket (either 1/4 inch jack or speakon more commonly) and attach the two extension cables to the socket. It is important that the connections to the socket are the same as the connections in your extesion cab + to + and - to - or you will end up with the two cabs 'out of phase' with each other.

As I said, it may be possible but involves a fair bit of work so you have to decide whether it's worth it.

The other option would be to get a power amp and cabinet and feed them from your line out or bi-amp output sockets depending on what you wanted to achieve[/quote]