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100dB/watt at 20 Hz is overkill. [message #27863 is a reply to message #27862]

Mon, 15 March 2004 12:59

Bill Fitzmaurice
Messages: 335
Registered: May 2009

Grand Master

I personally would recommend against trying for max SPL from a horn-loaded sub to 20 Hz, assuming that means you want to get at least 100dB/watt at 20 Hz, simply because there isn't enough program power down there to justify it. In my 'Tuba 24' article you can read how I did a series of RTAs at a 6,500 seat concert venue featuring over 30 top acts of various genres from C&W to Metal, and consistently the highest power requirements were from 60 to 100 Hz, with levels at even 40 Hz down 25dB from those at 60 Hz. This was not a product of the sound systems being used, usually at least a dozen 18 subs. In terms of what is actually required for live pro-sound a better way to go is a stepped response curve, with maximum SPL from 60 to 100Hz, where it's needed, and a more modest output capability below that where it isn't, and that's where my designs for live-sound subs are heading.

On the other hand, for HT a lower Fc is required, but at far lower levels, so my HT designs are aiming for just that, a lower Fc along with lower SPL to keep cabinet size within reason.

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[Message index]

		Paging BillF, GraemeG and SwollenL - Massive hornsub By: DanR on Mon, 15 March 2004 11:09
		Re: Paging BillF, GraemeG and SwollenL - Massive hornsub By: DanR on Mon, 15 March 2004 11:59
		100dB/watt at 20 Hz is overkill. By: Bill Fitzmaurice on Mon, 15 March 2004 12:59
		Re: 100dB/watt at 20 Hz is overkill. By: DanR on Mon, 15 March 2004 14:04
		Re: 100dB/watt at 20 Hz is overkill. By: Bill Fitzmaurice on Mon, 15 March 2004 16:29
		Re: 100dB/watt at 20 Hz is overkill. By: Wayne Parham on Tue, 16 March 2004 17:12
		Re: 100dB/watt at 20 Hz is overkill. By: Bill Fitzmaurice on Tue, 16 March 2004 17:40
		Re: 100dB/watt at 20 Hz is overkill. By: Wayne Parham on Tue, 16 March 2004 22:58
		40hz even seems really impressive with PA By: Mike.e on Mon, 15 March 2004 18:06
		Re: 100dB/watt at 20 Hz is overkill. By: GraemeG on Tue, 16 March 2004 05:07
		Re: 100dB/watt at 20 Hz is overkill. By: Bill Fitzmaurice on Tue, 16 March 2004 06:59
		Magnum hornsub By: Wayne Parham on Mon, 15 March 2004 13:24
		Re: Magnum hornsub By: DanR on Mon, 15 March 2004 14:04
		Re: Magnum hornsub By: Wayne Parham on Mon, 15 March 2004 14:31
		MAG12 - Preliminary Announcement By: Wayne Parham on Tue, 16 March 2004 10:22
		hmm By: Mike.e on Tue, 16 March 2004 16:52
		Where are you? By: Bill Fitzmaurice on Tue, 16 March 2004 17:13
		New Zealand/. By: Mike.e on Wed, 17 March 2004 01:55
		Re: hmm By: Wayne Parham on Tue, 16 March 2004 18:01
		My philosophy is- By: Mike.e on Wed, 17 March 2004 01:59
		Re: MAG12 - Preliminary Announcement By: DanR on Wed, 17 March 2004 10:33
		Re: MAG12 - Preliminary Announcement By: jason on Wed, 17 March 2004 13:37
		Re: MAG12 - Preliminary Announcement By: hulkss on Thu, 18 March 2004 17:47
		Re: MAG12 - Preliminary Announcement By: bill W. on Thu, 18 March 2004 21:52
		Driver Frame Diameter By: hulkss on Sat, 20 March 2004 10:07
		Re: Driver Frame Diameter By: Wayne Parham on Sat, 20 March 2004 21:51
		Project News By: Wayne Parham on Thu, 25 March 2004 15:32
		Magnet weight By: jason on Sun, 21 March 2004 18:43
		Re: Magnet weight By: Wayne Parham on Sun, 21 March 2004 19:15
		Magnet structures By: Wayne Parham on Thu, 25 March 2004 15:42
		B12 - Eminence requests that the driver formerly known as MAG12 be called the B12 instead By: Wayne Parham on Wed, 22 September 2004 21:50
		Re: Paging BillF, GraemeG and SwollenL - Massive hornsub By: GraemeG on Tue, 16 March 2004 05:23
		Re: Paging BillF, GraemeG and SwollenL - Massive hornsub By: Wayne Parham on Tue, 16 March 2004 10:37

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