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Multi-Way Conventional loudspeakers with crossovers

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Old 14th January 2002, 11:20 PM   #1
griff is offline griff  Australia
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Default Centre Channel Design

Does anyone know of a centre channel design program??? Does anyone have any website links to centre channel designs and DIY projects????
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Old 15th January 2002, 01:30 AM   #2
Super is offline Super  United States
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Most loudspeaker design programs dont designate center channel design. However, I would suggest using one of these programs to create an MTM design, which is the most common center channel design. How much are you looking to spend? If your other speakers are DIY, its not a bad idea to use the same drivers so the system is coherent.
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Old 15th January 2002, 02:06 AM   #3
griff is offline griff  Australia
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this centre is the first of a complete system project and will form the basis of speakers to come, i am also in the middle of building a subwoofer using the adire shiva in a vented box application. I am looking to spend in total around $450 AUD including all woods, materials etc. I would prefer using vifa, scanspeak, focal drivers and tweeters due to there availability in Australia.
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Old 15th January 2002, 02:20 AM   #4
Super is offline Super  United States
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Have a look at www.zalytron.com

They have a number of MTM and Aria kits using Focal drivers, and even if you dont purchase a kit from them, they still offer the schematics and parts lists for most of their designs.
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Old 15th January 2002, 02:27 AM   #5
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dont forget peerless... verry good midrange/woofer drivers for verry good prices from WES components.

http://www.wescomponents.com/

order a caltalogue, check them out.

best of luck
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Old 21st January 2002, 12:11 AM   #6
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Does anyone have a method for calculating at what angle off the center axis that comb filtering would become an issue?

I suppose it would be dependant on the crossover frequency and driver spacing but my physics is a bit rusty.
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Old 27th January 2002, 11:40 AM   #7
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I have to say I am not convinced that MTM centre channels are the way to go, especially for a beginner. The effects that Greg are referring to are a feature of vertical MTM alignments (ie steering the vertical dispersion of the midrange) but no one has ever convinced me that a sideways MTM is a good idea. With a basic crossover and a simple cabinet the midrange peaks and nulls are very obvious to me on my couch as I move from left to right.

Griff, why not try a more conventional 2 way centre design? If you don't like the look of the speaker box laying on it's side you can always put a grill over it and pretend its an MTM

The advantages of this approach are:

1) You can more easily match the front soundstage by using the same drivers across the front and the same crossover/baffle dimensions

2) Impedance issues become simpler, no 3 Ohm centre channel loads to confuse your 5.1 amp

3) Level setting across the front is easier as sensitivity is identical

4) You don't have to worry about vertical mis-alignment by having vertical MTM's on the L/R and a horizontal MTM in the centre.

5) In a 2 way design the orientation of the tweeter relative to the woofer becomes *much* less important than in the MTM.

Marcus
www.theloudspeakerkit.com

P.S. I can help you with Vifa, Peerless and Scan Speak drivers in Melbourne if you like as well as sub amps.
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Old 27th January 2002, 08:52 PM   #8
griff is offline griff  Australia
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Thanks for the reply, interesting thought, ive vistited your website a few times in the past but havent had a chance to audition your speakers. Do you have a catalogue, or price list that you could possibly email to me regarding the raw drivers? grifter44@hotmail.com

thanks
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Old 28th January 2002, 12:23 AM   #9
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Grill,

No I don't. just let me know what you need and I can price it for you.

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Old 28th January 2002, 04:39 AM   #10
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I'd also consider Audax which are available in australia thru ME technologies @ http://www.me-au.com/loudindex.htm
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