Opening up a new thread to update as the build progresses.
This is going to be a long lasting build .. with the baby at home and long hours at work it might take a couple of months or more until things get all done. I will update with some pics as I go through it though.
These are going to be placed nearfield behind an HT sofa (2 HT loveseats, one behind each), in a 17x18x8 room. With them being 30 inch deep, they would be almost up against the rear wall too.
Simple sketch of what it roughly would look like (I would do this in SketchUp but I think I mentioned I barely have any time to work on this ?
). Box external size, 30" deep x 60" long x 25" high
Is there an issue with the slot port also not extending to the side walls ? I tried to keep the holes square, so I ended up with either 2 x 5" x 5", or 2 x 4.5" x 4.5" as described below. Just figured might be less chuffing vs something like 7" x 2" or so ..
Before I prepare my cut list and go cutting though, please help me decide between these two options.
I really want to get as low extension possible, but maybe I am pushing things too much and lose too much up higher. For some reason the 14Hz tuned box just looks like a more appropriate option when looking at the SPL curve, and it pretty much has more output down to maybe 12.5 Hz ..
But the lower tuned box, maybe it will be a bit less strain on the amp (less potential clipping ..) based on the apparent amp power - VA (attached). But most importantly, there is just something magical about that 10Hz figure, and the lower tuned box will give me about 7dB more. Is this worth losing 2-3 dB from 12Hz up ? Maybe not much source with 10Hz is out there anyway. And maybe 104dB @ 10Hz is not much to be worth chasing anyway ? (though likely a few dB higher given there will be two subs). Can ~105dB @ 10Hz be felt in any way, or is this simply too low and not worth it ?
I will likely be listening at -25 volume level (~80dB), but planning to use a house curve that would bump up the 10Hz to maybe 30-35 dB hot (there will be a limiter set to prevent blowing up the driver, based on the WinISD cone excursion results, i.e. make sure it does not go more than 22mm).
The idea is, decide which option I like, maybe cut the panels for one box one weekend, start gluing a box another, add bracing the following, etc .. put a weekend in here and there with no time at all, so yeah, it is going to be a long one
Port Air Velocity
Amp apparent power VA