Adding an extension speaker

Covers entire Yamaha THR range of guitar amps, heads and cabs.

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Dueducs
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Joined: Thu Feb 22, 2018 6:20 am

Adding an extension speaker

Unread post by Dueducs » Tue Dec 25, 2018 11:25 am

Hi All,
First post!
I want to modify my THR10C to add an extension jack. I haven't gotten into it yet, but I believe the extension should be 8ohm. Please correct me if this is wrong.
Assuming that is correct, my question is this...
What would be the best speaker to use? I was thinking of adding a tweed Blues Deluxe 1 x 12" cab, but started to think that using this cab with a modeled speaker might not sound so good. I love the sound of my THR 10C (with editor added compression and a Lovepedal Deluxe or Super Six added) and don't want to change that to much if possible.
Thoughts? Advice? :confusion-confused:

Thanks in advance.
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Saul
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Re: Adding an extension speaker

Unread post by Saul » Tue Dec 25, 2018 1:40 pm

Hi Dueducs, welcome to yamahamusicians.com :)

That's an interesting idea. Makes me wonder why there is not aux or speaker out on the THR but then I guess that defeats the idea behind these mini amps.

Would the THR be able to drive such a large speaker? And would you want sound coming from both the THR itself and the external speaker?
Saul
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Dueducs
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Re: Adding an extension speaker

Unread post by Dueducs » Tue Dec 25, 2018 2:49 pm

I've seen this done on YouTube. One website explains how to add the extension jacks. With that mod, plugging cables into the jacks bypasses the internal speakers. This would be my goal as well. A couple vids (linked below) just sample the sound and offer no instruction at all.
So, it seems the little amp will drive a 12" speaker.



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Re: Adding an extension speaker

Unread post by Saul » Tue Dec 25, 2018 3:00 pm

I see what you mean. So basically it is simply diverting the THR speaker output into the external speaker. I guess with some sort of stepping in between to match impedance etc? I'm not an electronics guru so others will need to chime in here.

Definitely looks interesting though :)
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Re: Adding an extension speaker

Unread post by parametric » Wed Dec 26, 2018 3:18 am

A switching socket would be the most elegant solution.

Unplugged - it uses the internal Speakers

Plugged-in - it uses the connected external speaker, and the internal speakers are disconnected.

These sockets are common. Most keyboards with inbuilt speakers usually have them as Headphone sockets . . . .

Plug the Phones in - and the speakers are quenched . . . .

OK, Phones are Stereo, but I suppose that Mono versions exist too?

N.B. THIS solution is for an external PASSIVE Speaker.

If the external Speaker is ACTIVE, then you need a Line-Level output from the THR, NOT a speaker out . . .

parametric
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Re: Adding an extension speaker

Unread post by Buzzard » Wed Dec 26, 2018 9:49 pm

Hi Dueducs, welcome to the forum and the string section. :D

The smaller THR (5 and 10) amps are basically 4 units: full range stereo bass reflex cabinet, a hifi amp and a very versatile digital guitar preamp.
The fourth is a soundcard for recording and playback via USB cable.

here's a picture of the original 6 ohm full range speaker:
yamaha-thr10c-right-speaker-pulled-out B.jpg
Using other speakers will give you a different sound, if you find one you like better,
go ahead, as long as you don't press the amp circuit too hard. MINIMUM 6 ohms, 8 would be ok too.

Remember that your amp is stereo whenever using any of the built in effects, you have 5+5 watts at your disposal.

It's a fairly simple task to mount plugs and possibly a switch, but warranty voids if you mod the amp,

I usually plug the HEADPHONE OUT jack into a mixer, pa system or a hifi stereo if I need louder or modded sounds.

Best Regards
Peter
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