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bwaslo 29th December 2019 01:51 AM

They are the centers of the drilling locations. The size of the ports isn't critical, by the way, wavelengths where they are used are long. Just don't go out to beyond where the driver gaskets will be. And for best vertical pattern, I wouldn't let the height get any taller than in the drawing, want the centers as close as reasonable to the center of the waveguide. Too narrow height might possibly restrict air flow (though not likely).

That drawing is for 0.5' plywood side panels for minimum size and weight Be careful to make sure the back is well braced, maybe more than shown in the plans. My original ones were actually done with 3/4" ply, and seem quite dead, though.

Patrick Bateman 2nd February 2020 11:37 PM

Quote:

Originally Posted by bwaslo (https://www.diyaudio.com/forums/multi-way/292379-syns-post4821799.html#post4821799)
aaand.... as I'm waiting for glue to dry on the new cabinets, I browse over to the TechTalk site and find that the tweeter I'm using is apparently being discontinued! The vendor has it on Clearance (Peerless by Tymphany DFM-2535R00-08 1" Compression Horn Driver 2/4-Bolt 8 Ohm).

Way to kill a design, there, Tymphany. Guess I won't need to do a full build guide on this after all.

:(:(:(:(:(:(:(:(

Looks like QSC has jumped on the bandwagon:

https://imgur.com/nmfLMap.png

If I'm not mistaken, this is the first time that QSC has used a compression driver that wasn't made by Celestion or B&C.

grec 3rd February 2020 10:20 PM

bwaslo; I've recently added some BMR "ambience drivers" radiating some energy up the wall and to the sides, fed by a delayed signal of about 15msec, which helps depth illusion significantly and livens up the room sound in the rather damped room.

Hello Bill.
What will happen if we add the "ambience drivers with additional xover" just before the speaker on the same amplifier channel? Will it just change the whole speaker impedance or it will affect whole Small Syns crossover?

bwaslo 3rd February 2020 11:03 PM

It would change the speaker impedance at least in the range where the BMRs absorb current, but that shouldn't be much of a problem with most amplifiers. The effect doesn't seem to be as beneficial without the delay though.

grec 4th February 2020 12:18 AM

Quote:

Originally Posted by bwaslo (https://www.diyaudio.com/forums/multi-way/292379-syns-post6070484.html#post6070484)
It would change the speaker impedance at least in the range where the BMRs absorb current, but that shouldn't be much of a problem with most amplifiers. The effect doesn't seem to be as beneficial without the delay though.

Thank's again!

bourbon-neat 2nd March 2020 07:33 PM

SmallSyns almost done
 
2 Attachment(s)
My SmallSyns are up and running. They sound good. Will post frequency response in a few days.

Patrick Bateman 2nd March 2020 07:42 PM

Looks great!

grahamgraham 3rd March 2020 08:34 PM

Quote:

Originally Posted by bourbon-neat (https://www.diyaudio.com/forums/multi-way/292379-syns-post6106036.html#post6106036)
My SmallSyns are up and running. They sound good. Will post frequency response in a few days.

Nice! Looking forward to your measurements!


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