One of the pro's not mentioned yet, a transmissionline subwoofer has an edge over Bassreflex in portspeed. Chuffing noise should be less / TL design can be the solution if the port in a BR design is too long.
As I noted, Vb = ~Vas/1.44 = ~277.3264 L net with HR auto calculating ~277.385 L, so close enough for me 😉, though of course ideally need to use measured Vas.
My 10:1+ CR 'SWAG' turned out a bit optimistic, needing a short vent 'stub', so to keep it a 'simple' build ['KISS' design], shrunk it to ~9.4:1 to omit it.
Another way to find net Vb is to calculate a T/S max flat net Vb [20*Vas*Qts'^3.3], then tune it to Fs with a vent area = 1/3 Sd and use the sum of the two volumes as a baseline to modify my HR sim to compare any size trade-offs [attached].
GM
I appreciate the attention. Thank you. With me it needs to be the KISSS formula.🙂
That's a rather large cab. I think the cab for the 4315 is something like 3cu.ft. But this is about BR vs TL in terms of what I think I'm looking for as far as definition at the bottom goes. Another thread, "Chris's transmission line subwoofer project" looks intriguing but I would need four 2203s. It would be tough to find another pair.
That's a rather large cab. I think the cab for the 4315 is something like 3cu.ft. But this is about BR vs TL in terms of what I think I'm looking for as far as definition at the bottom goes. Another thread, "Chris's transmission line subwoofer project" looks intriguing but I would need four 2203s. It would be tough to find another pair.
You're welcome!
Yes, a large Vas dictates a large cab for low tunings.
Indeed! Plus it would be way larger too.
This is a compression horn/high efficiency mid-bass reflex driver, so excellent for a high SQ TL from ~16 - 90 Hz or shifted up to a max of ~140 - 800 Hz according to JBL, so quite versatile.
Hmm, based on a HR plot, the 4315 is an under-damped alignment [too small, tuned too high] and damped to 'taste' to get the desired response over [ln [400/31.5]/ln [2]] = ~ 3.67 octaves, so not really 'stressed', i.e. the sort of low distortion performance one needs for a high SQ studio monitor.
All that said, B0$3 proved that a 2:1 CR is the optimal [simple tube] TL trade-off between size/gain BW, so as little as ~119 L net, but even in a corner it will be VERY bass shy.
GM
Yes, a large Vas dictates a large cab for low tunings.
Indeed! Plus it would be way larger too.
This is a compression horn/high efficiency mid-bass reflex driver, so excellent for a high SQ TL from ~16 - 90 Hz or shifted up to a max of ~140 - 800 Hz according to JBL, so quite versatile.
Hmm, based on a HR plot, the 4315 is an under-damped alignment [too small, tuned too high] and damped to 'taste' to get the desired response over [ln [400/31.5]/ln [2]] = ~ 3.67 octaves, so not really 'stressed', i.e. the sort of low distortion performance one needs for a high SQ studio monitor.
All that said, B0$3 proved that a 2:1 CR is the optimal [simple tube] TL trade-off between size/gain BW, so as little as ~119 L net, but even in a corner it will be VERY bass shy.
GM
I think I should probably keep the 2203s for a future 4315 project as I have the rest of the drivers for them. Problem is I can't find original 3114 crossovers. I do like the TL project I mentioned. They look like they would augment the Monitor 3s well.
OTOH, a TL using the 2269 is a mere 20"X13"X6' tall.🙂
OTOH, a TL using the 2269 is a mere 20"X13"X6' tall.🙂