Legacy Trace Elliot combo specs

[Ajoten]

Quick (hopefully) question. 

I have a Trace 715 SMC combo, 150W, which has 2 extension speaker sockets saying "min 4 ohms". However all the manuals I can find online say you can't use an extension cab. So can I or can't I?! 

Think it's from 1999 if that makes any difference... 

Edited September 4, 2018 by Ajoten

[milford59]

I have the 7215SMC, and the manual (which covers your combo as well) is pretty clear, as you say .... it seems crazy that they would put extension sockets on the back of yours - and then tell you not to use them !!

[thodrik]

I think that the chassis for the combo head was the same as the chassis used for the head only version of the amp. A cost saving measure by Trace Elliot. Some of the units shipped with the extra jack socket covered with a plug to stop you using it. Still annoying though. 

[Ajoten]

Damn. I briefly got my hopes up as the manual for the 715 (no following letters) said no cabs, but a generic one for the SMC range simply didn't mention it.

So where does that leave me? I can plug "anything" in but it has to be 4 ohm?

[Sparky Mark]

Does the amp in your combo have two or three speaker outlets?

[Sparky Mark]

If the speaker in your combo is marked as 8 ohms then you will be okay to connect another 8 ohm extension cab giving the total impedance of 4 ohms.

[Ajoten]

The manual I'm looking at says:

"The 715 combo produces 150Watts into its internal 4-Ohm speaker and it is not possible to add further speaker cabinets."

Edited September 5, 2018 by Ajoten

[Sparky Mark]

You have an option to replace the internal 4 ohm speaker with a suitable 8 ohm version, then you can add another 8 ohm cab. Two 8 ohm cabs will be significantly louder than the single 4 ohm internal speaker.

[Merton]

11 hours ago, Ajoten said:

The manual I'm looking at says:

"The 715 combo produces 150Watts into its internal 4-Ohm speaker and it is not possible to add further speaker cabinets."

Edit - thodrik is correct

Edited September 6, 2018 by Merton

[fleabag]

Yup, as Sparky said, a 2nd cab will do wonders, and get some serious air moving

[Ajoten]

I know, annoying I can't have one. 

[Sparky Mark]

4 hours ago, Ajoten said:

I know, annoying I can't have one. 

Not without swapping out the 4 ohm speaker in your combo for an 8 ohm one; then you can.

[Ajoten]

Nope, also need to buy an amp with 2 speaker outs. 

[Merton]

6 hours ago, Ajoten said:

Nope, also need to buy an amp with 2 speaker outs. 

Your first post says you have two speaker outs on the amp? Should be fine

[Ajoten]

Sorry, I did, didn't I? The one with the plug in it to stop you using it isn't connected to anything. It's just a hole... 

[Phil Starr]

If there is a 4ohm speaker in there then that's it, you can't add anything. Putting an 8ohm speaker in there will lose a lot of the tone but allow you to add a second speaker.

Some of these old combo's had switched extension speaker sockets, plugging an extension speaker in disconnects the internal speaker. The min 4 ohm warning would make sense if that is how this combo was designed. You sometimes see combo's where you can physically pull out the jack for the internal speaker and plug another speaker in.

If you did go for an external cab one socket isn't a problem, most cabs have two sockets so you can just 'daisy chain' from the second socket to the second cab.

[Ajoten]

Oo ok. Is the effect of running them in series the same as in parallel? I feel that's a question answered several times elsewhere in this forum... 

EDIT: Ignore that question, it doesn't matter. Just finding out I can indeed run 2 cabs from my current amp is extremely helpful. Thanks!

Edited September 13, 2018 by Ajoten