BillFitzmaurice.info

Bill Fitzmaurice wrote: ↑Mon Jul 27, 2020 9:11 pm

SethRocksYou wrote: ↑Mon Jul 27, 2020 7:06 pm More specifically, the dispersion angle of the mid range. Enclosure width wouldn't matter?

It does. The narrower the enclosure the wider the dispersion. This applies down to the frequency where the enclosure width is one wavelength. At that point dispersion is 180 degrees. Below that you lose axial output, because the dispersion is wider than 180 degrees, so this sword has two edges.

The difference is about 200hz between the OTop8 and the OTop12. I get that. But, I am not understanding what "axial output" is (even after I did a quick search).

Side question on the T48:
If my maximum width for my pack space is 18” should I go with a 15” driver? 18” would be the narrowest, I feel like it’s right on the line and could go with a 12 or a 15, guess a 15 would yield more output.

SethRocksYou wrote: ↑Mon Jul 27, 2020 4:46 pm Hi Grant

G'day Seth

Tom Smit wrote: ↑Mon Jul 27, 2020 11:05 pm I am not understanding what "axial output" is (even after I did a quick search).

The output on a straight line out from the speaker. It falls off below the baffle step frequency, where the baffle is 1 wavelength, as below that the sound wraps around the speaker. It's the same effect as when you go from half space to full space boundary loading.

Ok guys it’s official, listed all my speakers and amps for sale here, on eBay, and Marketplace.
AND got my plans for the T48 and Otop 8

Thanks Bill.

J_Dunavin wrote: ↑Tue Jul 28, 2020 4:04 pm AND got my plans for the T48 and Otop 8

"Scaling way back"

Mostly back, ha!

Well if I only had a slim pair of T48s and a pair on Otops8s at least I could fit that in my basement. Currently that’s not an option.

Going back a touch... if 18” was my max width should I go with the 15” driver option?

J_Dunavin wrote: ↑Thu Jul 30, 2020 9:54 am

Going back a touch... if 18” was my max width should I go with the 15” driver option?

It's right there on page one of the plans.....you can put a 15 in an 18 inch wide cab.

And on the next to the last page of the plans - the voltage limit for the 15s are higher than the limit for the 12s......so yeah, use the 15.

Lightweight amplifier recommendations?
Thoughts on the QSC GX amps?

J_Dunavin wrote: ↑Sun Aug 02, 2020 4:08 pm Lightweight amplifier recommendations?
Thoughts on the QSC GX amps?

GX3 and 5 are not light. GX7 is.....it's an entirely different amp from the other two..

I've always used the Crown XLS series - very light and have served me well. But, the QSC GX7 are really nice amps....I've run those in another rig for several years.

Ok fellas, I had a guy come over this morning for a demo, and we got the cops called on us!!! Most epic!
The cops were totally cool with it all, I should of asked for a picture with them. Oh well maybe next time
Me and my little helper, in the back!

price lowered, also sold one pair of DRs

viewtopic.php?f=11&t=25789

Well the system is sold time to think about rebuilding .
So we’ve gone over the T48 and a pair of 3015 loaded is probably the best bang dollar per size.
I wonder How four slim T39s would compare loaded with the kappa pro 10lf?

Four 10" loaded (Not the 3010LF, but response should be relatively similar) T39 slims compared to 2 18" T48's @ 2.83v.

(Edit: Changed to 18" T48's after re-reading the thread)



Adding 24dB to the T39 trace for max output, 26.5dB to the T48 for it's max



To my eye, looks like the T39 slim is the better option.