Anybody see an issue with this?

[dthomas]

This is my first attempt at a tapped horn. The learning curve on Hornresp was not too bad.

I will build 4 of these for a band that does small clubs and the occasional gymnasium. Mostly crowds of less than 300. The drivers are Eminence buyouts 15" 16 ohm drivers. I measured the TS parameters on them and they have an Fs of 38Hz or so and appear to have about 4 to 5mm of xmax. Supposedly they are OEMs for a bass cab manufacturer. I have 800W to drive them in pairs.

The band that they are being built for does pop/college rock, think Kings of Leon, Modest Mouse, John Mayer etc...

[billfitzmaurice]

Model them in 2pi space for a more accurate result. Then model the same drivers in a vented cab, and then compare the maximum SPL plots for both to see if the TH was a worthwhile venture. IMO you're not getting a result that's commensurate with the cabinet size.

[dthomas]

I did I get more max displacement limited output and about 3 or 4 db more sensitivity in the horn cab than in a ported box. Do you think it is worth the effort to build the horns over a ported box?

I have read the dips that show up in HornResp are more overstated in the program than they are in real life? Do you think this is true. That dip centered at 70Hz was about as smooth as I could get the response and keep the response flat down to 40Hz.

Thanks for the response I considered posting this over at your site.

[billfitzmaurice]

I did I get more max displacement limited output and about 3 or 4 db more sensitivity in the horn cab than in a ported box. Do you think it is worth the effort to build the horns over a ported box?
.3 or 4dB better than a ported box isn't bad.

[dthomas]

3 or 4dB better than a ported box isn't bad.


That was what I was thinking.

Right now I have a pair of cabs with a 15" QSC woofer and a PSD2002 Horn I am crossing them active at 2KHz. They sound fine but off axis is less than ideal since most of their gigs are in pretty small clubs it probably is not that big of an issue but I did notice in a school gym where they did a dance if you were off the dance floor it really fell off. What would you recommend I put on top of these horns. What it be worth doing a single omni 15 repurposing the QSC woofer?

[billfitzmaurice]

What it be worth doing a single omni 15 repurposing the QSC woofer?It might. You would not use O15s with subs, and you wouldn't use just one of anything.

[dthomas]

It might. You would not use O15s with subs, and you wouldn't use just one of anything.

I did not mean one as just a single cabinet I meant one pair.

I am using a pair of cabs with the QSC 15" with an Eminence horn currently and actively crossing them at 2000Hz. I planned on highpassing this at 100Hz or so to a pair of the subs. They will play full range but run out of steam if I push them to hard that is why I am building the subs. Would I be better off with using a pair of 10s with the tweeter I have? I want to get a wider horizontal coverage pattern but stick with just one pair of mains and a pair of subs.

I guess what I am asking is if you had those subs I originally posted which of your Kits would you build to pair up with them for 100Hz up. I have a pair of Crown XLS202 amps to power the mids and tweeters.

[Brian Steele]

This is my first attempt at a tapped horn. The learning curve on Hornresp was not too bad.

I will build 4 of these for a band that does small clubs and the occasional gymnasium. Mostly crowds of less than 300. The drivers are Eminence buyouts 15" 16 ohm drivers. I measured the TS parameters on them and they have an Fs of 38Hz or so and appear to have about 4 to 5mm of xmax. Supposedly they are OEMs for a bass cab manufacturer. I have 800W to drive them in pairs.

The band that they are being built for does pop/college rock, think Kings of Leon, Modest Mouse, John Mayer etc...


Something's not right - when I put your figures into HornResp, I'm getting a net box volume of 507.5 l, not 405 l.

Also, make sure you're using the latest version of HornResp as it can model parabolic expansion.

What are the measured t/s parameters of each driver? With your input figures, HornResp is saying that Fs=38.02 Hz, Vas=167.12 l, Qes=1.07, Qms=4.60 and Qts=0.87.

[dthomas]

Something's not right - when I put your figures into HornResp, I'm getting a net box volume of 507.5 l, not 405 l.

Also, make sure you're using the latest version of HornResp as it can model parabolic expansion.

What are the measured t/s parameters of each driver? With your input figures, HornResp is saying that Fs=38.02 Hz, Vas=167.12 l, Qes=1.07, Qms=4.60 and Qts=0.87.

First thanks for looking at it. This is my first attempt at folding a horn and I may have it wrong. The horn should be 405L, I think I have the box too big but really struggled with folding the horn.

The TS parameters are

Fs = 38
Qes = .56
Qms = 4.6
Qts = .51
Vas = 169 liters

I appreciate you checking it and any direction on getting it right would be a help. I was trying to keep it under 32"H and still get my S1 and S4.

[dthomas]

Something's not right - when I put your figures into HornResp, I'm getting a net box volume of 507.5 l, not 405 l.

Also, make sure you're using the latest version of HornResp as it can model parabolic expansion.

What are the measured t/s parameters of each driver? With your input figures, HornResp is saying that Fs=38.02 Hz, Vas=167.12 l, Qes=1.07, Qms=4.60 and Qts=0.87.

Other than the TS parameters here is the other pertinent data:

S1 = 600, S2 = 942.74, S3 = 3137.71, S4 = 3425

L12 = 22.3, L23 = 209.9, L34 = 20.8

The Re of the driver is 12.2 ohms it is a 16 ohm driver.

[dthomas]

Something's not right - when I put your figures into HornResp, I'm getting a net box volume of 507.5 l, not 405 l.

Also, make sure you're using the latest version of HornResp as it can model parabolic expansion.

What are the measured t/s parameters of each driver? With your input figures, HornResp is saying that Fs=38.02 Hz, Vas=167.12 l, Qes=1.07, Qms=4.60 and Qts=0.87.

My box is 423L total, Horn Resp wants 405L. I figured this was ok or at least close enough. I figure by the time I take for all the internal panels and the driver itself I am close to the 405L.

[Brian Steele]

First thanks for looking at it. This is my first attempt at folding a horn and I may have it wrong. The horn should be 405L, I think I have the box too big but really struggled with folding the horn.

The TS parameters are

Fs = 38
Qes = .56
Qms = 4.6
Qts = .51
Vas = 169 liters

I appreciate you checking it and any direction on getting it right would be a help. I was trying to keep it under 32"H and still get my S1 and S4.

When I enter the driver parameters into HornResp using your t/s figures, I'm getting the following:

Cms: 1.53E-04
Mmd: 99.62
BL: 24.42
Rms: 5.95

You may want to recheck Le.

When I enter your horn parameters into HornResp, the schematic option in the Loudspeaker wizard is saying that the system volume is 491.119 litres

[dthomas]

When I enter the driver parameters into HornResp using your t/s figures, I'm getting the following:

Cms: 1.53E-04
Mmd: 99.62
BL: 24.42
Rms: 5.95

You may want to recheck Le.

When I enter your horn parameters into HornResp, the schematic option in the Loudspeaker wizard is saying that the system volume is 491.119 litres

Dang I hate it when I am wrong you are right. Not sure how I screwed up my TS parameters. Cause I just got the same numbers as you did when I reented.

I have hornresp Version 28, I think that is the latest. I should be ok with my box when I shorten L23 I still have a suitable response and good power handling. Took awhile to understand this program but once you get pass the learning curve it is not too bad.

[billfitzmaurice]

I guess what I am asking is if you had those subs I originally posted which of your Kits would you build to pair up with them for 100Hz up..DR200, DR250, DR280, OTop 12, OTop 15.