#1
I have Engl Screamer 50 combo, which obviously has open back. So I decided to try to close the back and see(listen) what kind of a difference it does. And yes, the bass response is better. I closed it by covering the open part with the z-5 footswitch. Why are combos often(always) open back? And is it somehow dangerous to close it? I've never seen or heard anyone closing those backs.
Last edited by imposiitin at Apr 18, 2011,
#2
Better Sound dispersion. Especially if it's only a single speaker. It allows the sound out the back which can deflect off walls or whatever's behind. I think.
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#4
Mostly because if its a tube combo you need to be able to get some air flow to the tubes to keep them cool. Plus the amp itself is inside the cabinet, so if it was closed back the sound pressure could potentially damage things, if it has nowhere to go.
#5
1St dont close the back tge heat will kill your amp it wont hurt though if you close it like for half hr or so
but remember to apply some acoustic foam on the wood or............
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#7
Quote by littlephil
Mostly because if its a tube combo you need to be able to get some air flow to the tubes to keep them cool. Plus the amp itself is inside the cabinet, so if it was closed back the sound pressure could potentially damage things, if it has nowhere to go.


+1

also probably for better sound dispersion, as also suggested ^^^^^
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#8
put some acoustic foam in that shit if
you close it up. Otherwise bass would be
reflected lots and since the OB isn't designed with
that in mind it could get nasty
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Last edited by deepsal at Apr 18, 2011,
#9
Quote by deepsal
put some acoustic foam in that shit if
you close it up. Otherwise bass would be
reflected lots and since the OB isn't designed with
that in mind it could get nasty

... No closed back cab has acoustic foam in it. Acoustic foam doesn't absorb bass, it absorbs sound. The cab would sound like a muffled piece of shit.

You can't close it anyway; the amp was designed open back fora reason; for air flow. If you close it, things will get very hot very quick. Unless you also install vents, in which case it would be more trouble than worth it.
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#10
some cb's do have foam in them
BTW
I KNOW MY SHIT
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#11
I closed the back of my vox ad100vtxl allthough its not a tube amp, and I no longer even own it, but you could probly get away with building a 3/4 closed back to get tighter bass response and still allow airflow.
You might need to install a fan also? Im no expert
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Last edited by slipknot_420 at Apr 18, 2011,
#12
Quote by deepsal
some cb's do have foam in them
BTW
I KNOW MY SHIT

I have never seen a cab with acoustic foam in it. If anything, it would make the cab seem like it had MORE bass. It's like putting a pillow in a kick drum or in a sub box in a car.

I call shenanigans.

And congrats. Way to go on knowing your shit. .
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#13
Acoustic foam does sweet f**k all to bass. All it would do would be to rob you of high end, sound waves at bass frequencies are so long that the foam would do nothing, they'd just pass straight through it.
#14

I closed the fully open part, which is in the middle. The upper part is still "open" (covered with the metal plate with holes), is this enough to prevent damage or is it too closed ?
#15
That should be fine. As long as you leave a gap for ventilation and for pressure to escape, it'll be fine.