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Author Topic: Horn loaded speakers (re: the QSC powerpoint) Lyle Romer Phenomenal Film Handler Posts: 1400 From: Davie, FL, USA Registered: May 2002 posted 07-15-2005 10:05 AM                     While reading the QSC powerpoint presentation section about horn-loaded speaker systems and their efficiency I came across a question. Since the only issue with them seems to be below 200Hz, why has nobody designed a speaker system which is horn-loaded down to 200Hz and then crossed over to a direct radiator for 20-200Hz? Wouldn't this give most of the benefits of the efficiency of horns while eliminating the down side?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 07-15-2005 12:26 PM                     Lyle, They have...look at most of the 3-way systems out there for cinemas. Most of them are Horn loaded down to 250-350 Hz (depending on model) and then direct radiator below that. The Altec Voice of the theatre speakers were also essentially that as well (hence the cabinets were ported). The A-5 was horn loaded to about 125Hz, the A-4 was horn loaded to about 80Hz. They were only 2-ways systems though. Take the bass-wings off of an A-4 (or don't sink an A-5 into a baffle wall) and you can tell pretty quickly where the horn operation starts/stops. There are other issues associated with horns though...they are certainly the most efficient but often are not the most flat and more often than not have a "characteristic sound" associated with the horn design (this is often called "colored"). Horn designs have evolved a bit too for all of the frequency ranges.  |  IP: Logged Samuel Hynds Film Handler Posts: 50 From: Riverside, CA, USA Registered: Aug 2004 posted 07-15-2005 01:04 PM                     The mid frequency device of the MH-1063/1075 (from QSC Audio) has a frequency response from 250Hz to 1.8kHz. The horn is a loading type (10 inch driver with a 6 inch opening) with a phase plug inside the throat of the horn (to help the high frequency response).  |  IP: Logged

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