Collaborative Tapped horn project - Page 334 - diyAudio
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Old 5th May 2009, 03:58 PM   #3331
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Default large TH

Hi There: Only one way to find out if the simulation matches the reallity of a large, one octave, 45 hz crossover TH which reproduces sound really low... build it/measure it/ listen to it and hopefully report the results to the DIY community. ...regards Michael
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Old 5th May 2009, 04:37 PM   #3332
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Quote:
Originally posted by Don Snyder
As far as I know, the longest tapped horn built to date is Chris's Lab12.
Chris built 2, I built 1, and Tone P just needs to put on
the last panel to complete his. The acoustic length is just short of 19 feet.

I will certainly chime in with some photos soon with my Lab12. I'm using 3/4" apple ply. Decided to use a 12x14x1/2" Green edge clear acrylic for a driver access panel (also able to see the lab12)

Thanks
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Old 5th May 2009, 05:18 PM   #3333
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Well...I'm fairly serious.

I've already got subwoofers that make me worry about structural damage sometimes, below 25hz. One in particular. That's why I wanted to use one of the 3 drivers I listed originally I already have them and I'm very familiar with what they'll do in standard vented or sealed enclosures. It'll be easier for me to tell what the enclosure is doing to the drivers output. I just had a PM from someone yesterday that may turn into an interesting TH development. We'll see. I heard a TH50 pushed quite hard in a 4000cu ft room in someone's home 2 weeks ago, so yes, I know how dumb this would be in a residential setting. the TH50 was pretty wild. Who said it was destined to be in a home? It'd be for fun and research mostly.
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Old 5th May 2009, 05:34 PM   #3334
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Of all the things I've lost, I miss my mind the most!

Tom Danley's made several longer THs. The DT-20 is about 18 feet, and the SPUD is over 20 feet. Also Gietmanns has a beautiful
SPUD of his own.

Chris's may not be the longest, but it is still a great horn
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Old 6th May 2009, 01:14 AM   #3335
JLH is offline JLH  United States
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My longest tapped horn to date was the double Tang Band W8-740. It is still banned from the house. This thing would rattle EVERYTHING in the house. Path lenght was a little over 19 feet.

http://www.diyaudio.com/forums/showt...97#post1627597

Rgs, JLH
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Old 6th May 2009, 04:17 PM   #3336
tb46 is offline tb46  United States
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Default Impulse response comparison

Hi JLH,

I have always liked the design you shared in Post #2362, it gives such great control over the size of the compression chamber and the horn throat. As David McBean added an impulse response plot to Hornresp, here is yours and the SPUD:

Regards,
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Old 6th May 2009, 06:46 PM   #3337
JLH is offline JLH  United States
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Default Re: Impulse response comparison

Quote:
Originally posted by tb46
Hi JLH,

I have always liked the design you shared in Post #2362, it gives such great control over the size of the compression chamber and the horn throat. As David McBean added an impulse response plot to Hornresp, here is yours and the SPUD:

Regards,

Thanks for the kind words. I'm more used to being yelled at for that tapped horn. The wife still hates it.

I can't tell, but is that a good impulse response? What does one look for in a "good" impulse response?

Rgs, JLH
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Old 6th May 2009, 06:52 PM   #3338
JLH is offline JLH  United States
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Just to compare here is the response and impulse for my push-pull 8PE21 tapped horn. I think this is more like the impulse response we would want in a horn.
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Old 6th May 2009, 07:06 PM   #3339
tb46 is offline tb46  United States
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Default impulse response

Hi JLH,

quote: "... but is that a good impulse response? What does one look for in a "good" impulse response?"

For a tapped horn it looks quite good to me, actually looks better than the simulated response for the SPUD, but then there is the question, how do they compare in a measurement, and more importantly what do they sound like?

There is always something else to investigate, there may actually be a reason why I have always ended up with dual 15" in sealed boxes. :-)

Regards,
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Old 6th May 2009, 07:34 PM   #3340
tb46 is offline tb46  United States
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Default impulse response

Hi JLH,

Just as a comparison: Bas Horneman has a very nice thread on a horn project, and I tried to model his bass module in Hornresp, anyhow, here is the impulse response:

diyAudio Forums > Top >Loudspeakers >Full Range >Pictorial of an exponential/radial horn being made for me by a friend...:

Pictorial of an exponential/radial horn being made for me by a friend...
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