Jump to content
aaronlyon

DIY solid state backplate amplifier for speaker cabinet

Recommended Posts

I build a solid state amp for use with Helix, and installed it inside my 2x12 cab, so I have a convenient combo of sorts.

 

post-650790-0-09480600-1520901596_thumb.jpg

 

post-650790-0-70977700-1520901601_thumb.jpg

 

 

Parts came from parts-express.com, and include:

 

Sure Electronics AA-AB31194 1x300W Class D Audio Amplifier Board - T-Amp

 
 
 
The sound is as I expected: low noise floor, good clarity and punch, plenty of power to spare.
 
I am less happy about the fan in the power supply, which will never be noticed on stage, but is audible in my quiet room, and therefore a bit annoying. I may wire a fan on/off switch. I played loud for an hour, and there is no appreciable heat felt in the chassis.
 
  • Upvote 2

Share this post


Link to post
Share on other sites

Forgot to mention, total weight of amp, power supply, and aluminum backplate is 4 pounds 5 ounces. Very light!

 
I did add a switch for the fan--now I can silence it for in-house practice. Nice addition.

Share this post


Link to post
Share on other sites

I very much like this idea, but I'm curious: It seems as if it was an open-back cabinet and you've plugged the hole with that plate. Did that change the sound significantly?

Share this post


Link to post
Share on other sites

I very much like this idea, but I'm curious: It seems as if it was an open-back cabinet and you've plugged the hole with that plate. Did that change the sound significantly?

 

 

It's an Avatar cab with an oval opening--I already had the hole covered by plywood to make it a closed back cab, which I prefer for this cab. I just swapped the plywood for the aluminum backplate. Not much change, if any.

Share this post


Link to post
Share on other sites

I built a second version of this rig—this one is a 1x12 open backed cab with Jensen Neo Tornado speaker in a pine cabinet. So total weight is 27 pounds including SS power amp. Back saver!

 

I have now had a chance to play a live gig with this rig with great results. From Helix I go 1/4” out to cabinet for stage volume, and via cab/mic block to XLR out direct to PA.

 

Sounded great to me with my 64ears IEMs in one ear. Band members were happy, FOH guy was happy, I got compliments from two guitarists from other local bands, and from venue owner afterward.

Share this post


Link to post
Share on other sites

Great job, even if i prefer for me a complete  and ready solution (as i'm a electronic noob except pickups ;) ) and a dsp managed two way setup to use the Helix even for bass, acoustic.......

So i've chosen for me a Hypex module with a coaxial driver. But i congratualate to build this solution for just a few bucks - that's hard to beat.

A proposition to make things more long term stable: Putting the electronics in a separate compartment to reduce vibrations probably would  make their live longer. There's a pretty shockwave storm inside a cab. I know that most combo amps are build open too, but that's no argument.

 

(well - where are the smileys gone?) 

 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...