Apollo-7 MT Design

[01svtL]

The Apollo MTM cabinet is the perfect overall size that I'm looking for, however the cost is a bit more than I was looking to spend.

My thoughts are to buy the Apollo MT kit, but build it into a 1 cu ft cabinet with about the same dimensions as the MTM version, tuned to about 35 hz (2" Precision Port at ~5.5" long). Given the 7" Anarchy specs/capabilities, is this a good idea or is that too much volume for the one woofer? Probably of important note, is that I will not run it full range at high volume ever. When I'm looking to crank, I will employ a separate sub crossed at 50hz. However for lower level listening later in the evening, my hope is that this design would be fine without the sub yet still provide noticeable bass.

[djg]

Adequate.

https://www.youtube.com/watch?v=-iGD0p0E42A

[Chris Roemer]

If you don't know how to model boxes ( in WinISD, free from linearteam.org ), you should teach yourself. It's fun.
The 0.6cf box has a "better" rolloff than your proposed oversized box (yours looks like a roller coaster).
Your "change" only nets an extra 5Hz of extension (30Hz vs 35Hz). Down THERE, 5Hz amounts to about 1 full note.
Most rock ends in the low 40s anyway. (esp. w/a sub) you've really got nothing to gain.

[wogg]

I'm planning a build with the 708 woofers, and have settled on a 0.6cu ft vented as well. Same setup, 2" precision port about 11" long with a Fb of 35 netting a 35Hz F3. Definitely diminishing returns going larger for the box, doubling up to 1.2 cu ft only gets me down to 27Hz and loses a little sensitivity between 40 and 60 Hz. That woofer still takes full thermal power even with the larger box though.

[01svtL]

Thanks for the input guys.

[davidroberts]

Stick with the 0.6cu ft. I would be surprised if you didn't get more than enough volume out of the MT. Especially if you are using a sub. Pete Schumacher made a very nice design with these

[Steve Lee]

Some data for reference:

https://ampslab.com/blog/2020/11/19/anarchy704/

https://ampslab.com/blog/2020/12/14/anarchy-xt/

Looks like 13 liters or 0.46 cu ft (ported) is the sweet spot . . .

[silverD]

I'll be building the Anarchy-XT into BR-1 cabs soon. The parts count on the crossover is high. I have yet to use the XT25.

[Steve Lee]

By the time you subtract volume taken up by the drivers and port you should wind up near the 0.46 cu ft / 13 liter mark as those cabs look like 0.54 cu ft / 15.29 Liters.

Will the chosen drivers actually fit into the factory cutouts without additional material removed?

[silverD]

Steve, I will need to route the woofer recesses larger and as the anarchy frame is over 7 inches in diameter. The tweeter recess is actually smaller in diameter by a quarter inch. I will probably print a plastic trim ring to fill this gap.

[Steve Lee]

Nice. I'd like to see a pic of the finished product and how you accomplished the routing if you would be so kind.

[silverD]

Sorry for hijacking the thread, I have created a new one for this project.