The JBL M2 is pushing it big time, with a 15" woofer.
I would never consider an 18" woofer, and if push comes to shove I'd use a 12" woofer instead of a 15" woofer.
I would never consider an 18" woofer, and if push comes to shove I'd use a 12" woofer instead of a 15" woofer.
If the crossover is much lower....you'd change your mind right? With my project I'm aiming for 200hz to a 15" but some people are suggesting that I cross to 18".
The rumor is that the Axi2050 might be able to play lower than 200hz....otherwise 300hz has been done with beryllium. So what about 300hz then.
Here's the frequency response of a BMS 4526HE that I put on a 3D printed Unity horn. Thread is here : Nexus - World's Easiest Controlled Directivity Loudspeaker
Here's an Eminence N151 on a QSC waveguide
The performance of both is good, but I think the Eminence is tough to beat. The cost is about the same. It's readily available.
The thing that Eminence taught me, is that it's possible to get beamwidth control all the way to 20Khz IF (and this is a big "if") the phase plug is right.
Geddes was saying this for years, of course.
In a nutshell, the OLD way of making horn speakers was that we bought a compression driver and we bolted it to a horn.
But the *correct* way to do it is to get a compression driver with a relatively fast expansion rate, and then match the waveguide to the compression driver.
When we do that, we can get beamwidth control that goes beyond the limits of a one inch throat. (13,500Hz.)
Regarding the last statement, I have heard that drivers may fail to maintain a flat wavefront, but iirc the directivity is not limited by the driver size, just the efficiency.
gedlee said:
This is a clone of it:
B-52 PHRN-1014 1" Horn 10" x 14" Bolt-On
I used the original, but they're basically identical.
B-52 PHRN-1014 1" Horn 10" x 14" Bolt-On
I used the original, but they're basically identical.
Hey Patrick,
I was thinking of building a 2-way with Eminence N151 since I already have the qsc horn. Is there an existing design out there that uses the aforementioned with a knock-down box (PA Knock-Down Trapezoid Plywood Speaker Cabinet for 12" Driver) and a B&C 12TBX100? Thanks in advance!
Ian
I was thinking of building a 2-way with Eminence N151 since I already have the qsc horn. Is there an existing design out there that uses the aforementioned with a knock-down box (PA Knock-Down Trapezoid Plywood Speaker Cabinet for 12" Driver) and a B&C 12TBX100? Thanks in advance!
Ian
An externally hosted image should be here but it was not working when we last tested it.
This is a Tympany DFM-2535R00-08 on the same horn.
There is not.
Closest to it is the Econowave Deluxe. But that's quite different : different tweeter, different woofer, same waveguide.
The change in tax laws delivered me a tax bill the size of the Titanic, so I haven't had much time for diyaudio. But my next project that I hope to get off the ground is basically a modern version of the old Lambda Unity Horn, but this time using the QSC waveguide.
My thought is that it should be possible to 3D print a midrange adapter, that you would simply screw into the QSC waveguide.
So this would be a way to get most of the goodness of the original Lambda Unity Horn, but it wouldn't require cutting a Unity horn out of plywood, or 3D printing the entire waveguide. You'd just 3D print the adapter for the midrange, drill the holes for the midrange taps, and mount the midrange adapter onto the horn.
Should be simple and effective I hope.
Stay tuned, waveguides arrive at my house on Thursday...
Bad news Patrick. Parts Express appears to have only 20 of those waveguides in stock. Now that's not to say that there aren't a bunch of them around waiting for a super interesting project like yours (I'm guilty of having 4 waiting for the right project). But I think it might limit the number of folks who could actually build such a MEH.
That said, please go ahead and do it. I bought those waveguides because I had a feeling I could figure out a way to make an MEH out of them without too much difficulty (I just never got around to it). This might just give me the kick in the posterior necessary to move ahead.
That said, please go ahead and do it. I bought those waveguides because I had a feeling I could figure out a way to make an MEH out of them without too much difficulty (I just never got around to it). This might just give me the kick in the posterior necessary to move ahead.
Currently getting close to finishing a similar project, an 18x13x12in phrn 1014 MEH. The second picture shows one of 4 3d printed baffle covers to make the wg flush with the cabinet. Bass drivers fire out the slots in the side with the goal of doing something similar to the small syns. Midrange is attached using the same method as the small syns as well.
Drivers are:
Hf108r
Tf0410mr
8fg51 (x2)
Drivers are:
Hf108r
Tf0410mr
8fg51 (x2)
