Ajoten Posted September 4, 2018 Share Posted September 4, 2018 (edited) 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 Quote Link to comment Share on other sites More sharing options...
milford59 Posted September 5, 2018 Share Posted September 5, 2018 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 !! Quote Link to comment Share on other sites More sharing options...
thodrik Posted September 5, 2018 Share Posted September 5, 2018 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. Quote Link to comment Share on other sites More sharing options...
Ajoten Posted September 5, 2018 Author Share Posted September 5, 2018 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? Quote Link to comment Share on other sites More sharing options...
Sparky Mark Posted September 5, 2018 Share Posted September 5, 2018 Does the amp in your combo have two or three speaker outlets? Quote Link to comment Share on other sites More sharing options...
Sparky Mark Posted September 5, 2018 Share Posted September 5, 2018 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. Quote Link to comment Share on other sites More sharing options...
Ajoten Posted September 5, 2018 Author Share Posted September 5, 2018 (edited) 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 Quote Link to comment Share on other sites More sharing options...
Sparky Mark Posted September 5, 2018 Share Posted September 5, 2018 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. 1 Quote Link to comment Share on other sites More sharing options...
Merton Posted September 6, 2018 Share Posted September 6, 2018 (edited) 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 Quote Link to comment Share on other sites More sharing options...
fleabag Posted September 10, 2018 Share Posted September 10, 2018 Yup, as Sparky said, a 2nd cab will do wonders, and get some serious air moving Quote Link to comment Share on other sites More sharing options...
Ajoten Posted September 12, 2018 Author Share Posted September 12, 2018 I know, annoying I can't have one. Quote Link to comment Share on other sites More sharing options...
Sparky Mark Posted September 12, 2018 Share Posted September 12, 2018 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. Quote Link to comment Share on other sites More sharing options...
Ajoten Posted September 12, 2018 Author Share Posted September 12, 2018 Nope, also need to buy an amp with 2 speaker outs. Quote Link to comment Share on other sites More sharing options...
Merton Posted September 13, 2018 Share Posted September 13, 2018 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 Quote Link to comment Share on other sites More sharing options...
Ajoten Posted September 13, 2018 Author Share Posted September 13, 2018 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... Quote Link to comment Share on other sites More sharing options...
Phil Starr Posted September 13, 2018 Share Posted September 13, 2018 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. Quote Link to comment Share on other sites More sharing options...
Ajoten Posted September 13, 2018 Author Share Posted September 13, 2018 (edited) 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 Quote Link to comment Share on other sites More sharing options...
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