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Re: 100dB/watt at 20 Hz is overkill. [message #27868 is a reply to message #27865]

Mon, 15 March 2004 16:29

Bill Fitzmaurice
Messages: 335
Registered: May 2009

Grand Master

You're on the right track. For Pro-sound horn loaded efficiency is necessary only down to 40 or 50 Hz, and if you design the box with a gradual (12dB) rolloff below Fc (minimal reactance annulling so that the driver reverts to direct radiator mode for the octave below Fc) there is still plenty of power available for the lower octave. As for drivers, the biggest problem is that designers tend to use drivers with Fs way too low. Eminence has come out with a 12 inch Magnum (I already have a prototype in hand and it is nice) with a 43 Hz Fs that is much more amenable to horn loading than the Lab12 for pro-sound duty.

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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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