Bandpass/Horn Hybrid

description for this forum

Moderators: simon5, Admin

Bandpass/Horn Hybrid

Postby Fatawan » Fri Jul 16, 2010 2:08 pm

John said the following back in June on AVS:

If you feel like taking on a complex build we have some plans in the works for a bandpass/horn hybrid sub using a pair of TD18H's. With proper power a singele dual 18 cabinet will get you upwards of 140dB down to the corner point

Could we get some more info/specs on that? Sounds interesting!
Fatawan
 
Posts: 3
Joined: Fri Jul 16, 2010 2:06 pm

Re: Bandpass/Horn Hybrid

Postby simon5 » Sat Jul 17, 2010 12:31 am

I will try to reach John about it, but he's hard to reach lately, he's really busy... well he's always busy hehe ! 8)
simon5
 
Posts: 3090
Joined: Thu Dec 02, 2004 2:49 pm

Re: Bandpass/Horn Hybrid

Postby Fatawan » Wed Jul 21, 2010 9:28 am

No luck in getting some more info? I wonder what the corner point might be? Sounds like an interesting project to build, especially if plans are already drawn up! :mrgreen:
Fatawan
 
Posts: 3
Joined: Fri Jul 16, 2010 2:06 pm

Re: Bandpass/Horn Hybrid

Postby simon5 » Thu Jul 22, 2010 5:34 am

No luck yet... sorry ! 8)
simon5
 
Posts: 3090
Joined: Thu Dec 02, 2004 2:49 pm

Re: Bandpass/Horn Hybrid

Postby stryke » Thu Jul 22, 2010 1:14 pm

This is actually a design done by Rory Buszka. I'll see if he wants to share the design yet or not.

John
*******************************************************************************
Acoustic Elegance/AE Speakers
1825 Mills St
Green Bay, WI 54302
phone: (920) 328-5206
stryke
Site Admin
 
Posts: 1801
Joined: Tue Sep 24, 2002 6:54 pm
Location: Green Bay WI

Re: Bandpass/Horn Hybrid

Postby Fatawan » Thu Jul 22, 2010 9:37 pm

Fatawan
 
Posts: 3
Joined: Fri Jul 16, 2010 2:06 pm

Re: Bandpass/Horn Hybrid

Postby MaximumPuffer » Wed Jul 28, 2010 10:57 am

http://www.decware.com/whorn.htm

kinda looks like this with a vented rear chamber
MaximumPuffer
 
Posts: 4
Joined: Thu Nov 27, 2008 4:31 pm

Re: Bandpass/Horn Hybrid

Postby Taterworks » Sat Sep 11, 2010 6:44 am

Hello gents,

Thanks for the interest in the Carnivore design. I did this in early 2010 for John's TD18H+ as a state-of-the-art pro audio subwoofer. For our performance target, we were competing with the Turbosound TSW218 (non-DP), a $5000+ box. The Carnivore is about the same size in front, but 8" deeper, so keep in mind that it is very large, and will just fit through a single door. Because it is a pro audio subwoofer, its corner is somewhat higher than most home theater subs, around 35 Hz. This subwoofer is designed to reinforce pro audio main speakers, which are usually most comfortable being rolled off in the midbass, between 55 and 75 Hz. The simulated capability of a single box (using Hornresp) is 140dB at 40 Hz and 142 dB at 85 Hz with 4000W available, so we met our performance target and exceeded the performance of the TSW218 by about 5dB at 40 Hz. However, if your intention is to use this design as a home theater subwoofer, you might be disappointed in its LF extension (which is a function of the design and not a limitation of the drivers themselves).

Best Regards,

Rory Buszka
Rory Buszka

If it works, but you don't know why it works, then you haven't done any engineering.
Taterworks
 
Posts: 9
Joined: Mon Sep 10, 2007 8:04 pm

Re: Bandpass/Horn Hybrid

Postby simon5 » Sat Sep 11, 2010 10:39 am

Nice design, I like your idea !

Probably very hard to beat... at any price... 8)
simon5
 
Posts: 3090
Joined: Thu Dec 02, 2004 2:49 pm

Re: Bandpass/Horn Hybrid

Postby paulspencer » Mon Nov 08, 2010 3:42 am

That's an interesting design. Looks like a front loaded horn with a vented rear chamber. Normally you would have a sealed rear chamber, but this one squeezes out more LF output with the vent.
.:: Red Spade Audio .:: Writer for Hifi Zine
User avatar
paulspencer
 
Posts: 140
Joined: Wed Aug 13, 2003 2:12 am
Location: Melbourne

Re: Bandpass/Horn Hybrid

Postby MaximumPuffer » Wed Apr 13, 2011 6:31 am

looks to me like a 6TH order bandpass with the front high tuned chamber replaced with a short horn. Would i be correct in assuming that this might extend its upper usable bandwidth and possibly lower GD in the higher frequencies?
MaximumPuffer
 
Posts: 4
Joined: Thu Nov 27, 2008 4:31 pm

Re: Bandpass/Horn Hybrid

Postby paulspencer » Wed Apr 13, 2011 6:50 am

You would need to know some details of the design, including tuning point. Front loaded horns can have a sealed or vented rear chamber. The latter, which this appears to be, offers greater control of excursion at the vent tuning point, compared to a sealed box. Hence excursion limited output can be increased with adequate power, assuming an appropriate high pass filter is used. I'd guess that this is what is going on.

If you see it as being like a 6th order BP with a front horn replacing the front chamber, that is just another way of saying the same thing. The front horn will probably also have a filtering effect like a BP6, probably to a lesser degree. Horn loading involves both a high and low pass filter.
.:: Red Spade Audio .:: Writer for Hifi Zine
User avatar
paulspencer
 
Posts: 140
Joined: Wed Aug 13, 2003 2:12 am
Location: Melbourne


Return to Home Theater and DIY Subwoofers

Who is online

Users browsing this forum: No registered users and 2 guests