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Multi-Way Conventional loudspeakers with crossovers

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Old 12th June 2007, 10:44 AM   #1
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Default New house, new HT ...

New house, new HT ... with a new set of challenges!

The room is medium sized, approx 4.6m deep x 3.9m wide and 2.75m floor to ceiling.

Floor plan:

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System schematic:

Click the image to open in full size.

Speakers are Vifa P17 midbass and D25AG dome tweeter in MTM with a passive crossover on open baffle panels approx 400mm wide (Fequal ~ 200 Hz) with 2 x Rythmik Audio DS12 direct servo 12" sealed subs. The OB panels sit on top of the subs. Dimensions shown give cancellation of first front and rear wall reflection.

I have two problems:

1. Normally I have a small amount of hum which becomes a problem if I use the plate amp's high pass (low level outputs)

2. Midrange problem around 600 Hz where sustained notes seem to ring like crazy (I didn't have this problem in a previous room).

I find the ringing is mostly a problem with piano or with midrange horn sounds in the original. An opera singer hitting high notes (not my usual thing) is unbearable. I note that this problem doesn't seem to occur when I go up close to each panel, so this reinforces my thinking that it's a room problem.

Any ideas on how to fix either problem?
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Old 12th June 2007, 10:57 AM   #2
Did it Himself
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Acoustic damping panel(s)?
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Old 12th June 2007, 01:58 PM   #3
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I tried a crude attempt. I used what I had on hand as wall treatment - large areas using quilts (3) and blankets draped over large panels. This made the room sound far too dead, the room sounds better bare. The damping didn't fix it anyway, but that may be because it wasn't effective in the midrange, not being thick.
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Old 12th June 2007, 04:04 PM   #4
herm is offline herm  United States
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At 600 hertz, the wavelength is about 2 feet.

Are the speakers placed about 2 feet from the side wall AND
about 2 feet from the back wall?

Pull them out into the room a bit and listen.
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Old 12th November 2008, 03:50 AM   #5
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Hi Paul,
Did you solve the noise problem ?
Can you put up the crossover schematic for the Vifa MTM ?
Cheers,
Ashok.
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