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Author Topic: Simple Sub Question  (Read 3576 times)

Ivan Beaver

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Re: Simple Sub Question
« Reply #10 on: March 23, 2005, 07:01:54 pm »

Nowadays many people are not so much concerned with what is in a cabinet as opposed to how well it performs.  Look at all the concert boxes that use 1" horns and small mids as opposed to the old days when 2" and 10/12" mids were the rule and nobody would consider a sub without 18" speakers.  So the size is not that big a deal (except in the car audio world)anymore.

My question would be (when you say it goes to 20hz) is how far down in level is 20hz and what type of sensitivity does the cabinet have.  Tom Danley's new company (Danley sound labs) is working on a new sub in which the -3dB point is around 17 Hz or so.  The overall sensitivity is going to be a little low for PA work (around 95dB 1 watt @ 20 Hz), but it would still have many uses.

What type cabinet were you going to use?

Ivan Beaver
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Can I have some more talent in the monitors--PLEASE?

Ivan Beaver
dB Audio & Video Inc.
Danley Sound Labs

Rob Burgess

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Re: Simple Sub Question
« Reply #11 on: March 23, 2005, 07:51:00 pm »

Geri O wrote on Wed, 23 March 2005 16:37

Oops, my mistake. You are indeed correct, I mistook your answer as a negative response.


    Yeah, "no" is usually a negative answer.  Except sometimes  Laughing

Geri O wrote on Wed, 23 March 2005 16:37


My apologies,
Geri O


    No apologies necessary, go have a Barqs and put it on my tab  Cool

--
Rob
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[x]

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Re: Simple Sub Question
« Reply #12 on: March 23, 2005, 08:09:42 pm »

My thought was for the future when (only in my dreams, probably)  I have my own speaker company, BHFSpeakers, and the professional division BHFProfessional would make a 3x15" vented cabinet loaded with 3x Ciare 15.00SW. With recent changes, the SW range can now handle 1250 watts AES, up from 1000 watts AES so you could definitely pump in the power (3,750w into 3.2 ohms). The tuning point would be kind of low and the major caveat that comes to mind is that you wouldn't want to try and use them outdoors. I wanted to test the waters and see whether or not people would trust a cabinet that employed three 15" woofers instead of two 18" woofers. I was inspired by a triple-15" cabinet made by Stage Accompany.
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Geri O'Neil

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Re: Simple Sub Question
« Reply #13 on: March 23, 2005, 08:31:40 pm »

Dwarf wrote on Wed, 23 March 2005 18:51

 No apologies necessary, go have a Barqs and put it on my tab  Cool

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Rob



NOW yer talkin!
Thanx!
Geri O
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Mark Seaton

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Re: Simple Sub Question
« Reply #14 on: March 30, 2005, 02:21:49 pm »

BHFProfessional wrote on Wed, 23 March 2005 19:09

My thought was for the future when (only in my dreams, probably)  I have my own speaker company, BHFSpeakers, and the professional division BHFProfessional would make a 3x15" vented cabinet loaded with 3x Ciare 15.00SW. With recent changes, the SW range can now handle 1250 watts AES, up from 1000 watts AES so you could definitely pump in the power (3,750w into 3.2 ohms). The tuning point would be kind of low and the major caveat that comes to mind is that you wouldn't want to try and use them outdoors. I wanted to test the waters and see whether or not people would trust a cabinet that employed three 15" woofers instead of two 18" woofers. I was inspired by a triple-15" cabinet made by Stage Accompany.


Hi Rory,

Unfortunately we have to work within the limits imposed by physics.  Hoffman's iron law is always at work.  Even when we can get ahead of it's predictions with highly optomized bandpass designs, we are still subject to the same trade offs in box volume and sensitivity as related to low frequency extension.  A rule of thumb Tom Danley loves to remind me of is that for a given box volume with an optimized design, you take a hit of 9dB! for every octave you want to push the cut-off lower.

Regards,
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Seaton Sound, Inc.
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Mike {AB} Butler

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Re: Simple Sub Question
« Reply #15 on: March 31, 2005, 09:32:26 am »

Mark Seaton wrote on Wed, 30 March 2005 11:21


Hi Rory,

Unfortunately we have to work within the limits imposed by physics.  Hoffman's iron law is always at work.  Even when we can get ahead of it's predictions with highly optomized bandpass designs, we are still subject to the same trade offs in box volume and sensitivity as related to low frequency extension.  A rule of thumb Tom Danley loves to remind me of is that for a given box volume with an optimized design, you take a hit of 9dB! for every octave you want to push the cut-off lower.

Regards,


Mark,
Spot on. My personal experience in this was some years back I took a bandpass design I had done, and tried redesigning the box to get another 1/2 an octave bottom out of it. I increased the volume and retuned both ports (6th order bandpass). Result? Much smoother, better low frequency cutoff (using the same woof), BUT a huge -10 dB hit!
Your advice to Rory is correct.. Simulations won't always show the final actual efficiency of the box.
Thanks and Regards,
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