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In Reply to: RE: Is it possible to get Bass control with Tubes and A7 Speakers? posted by Monte Verdi on October 13, 2009 at 14:14:03
Altec 825/828 cabinets are flimsy and dissipate a significant amount of the bass energy the drivers can produce.
Install extensive internal bracing, i.e. 2x4 glued and screwed diagonally on the sides, top and bottom, 2x2 glued and screwed in the corners. Caulk all of the corners and anywhere that may leak. Seal off the midbass horn flare sections and either extensively brace them or stuff them until they are dead and solid: I filled mine with sand, but that adds about 150 lbs per cabinet. Re-size the vent to 100 sq. in. and make sure the front of the cabinet at the vent is well braces as well. Finally make sure the cabinets are sufficiently damped internally, at least the back, one side and the bottom to kill standing wave resonances.
Having done that you should have an A7 system performing to it's designed specs. The midbass will be much clearer and blend with the upper horn better. The bottom will be much tighter, more defined.
Having said that, even of you were to install "wings" as prescribed in VOTT theater installations you will get good output down about 3db at 45Hz and falling rapidly below that. That is what they do.
With those mods even a sonic impact T-amp will have decent bass. Without the mods the cabinet is highly resonant in all the worse ways and producing a veritable sonic sludge.
eso
They were a carnival of American decay on parade, and they had no idea of the atrocity they had inflicted upon themselves–Henry Chinaski
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