need a quick design for MTM center with P13WH00

johnmark · 29th March 2007, 08:52 PM

I have a friend (actually my boss0 who wants me to whip up a quick center channel MTM and he wants to use the old Vifa P13WH00 and an aluminum dome in order to match the sound of his mains which use similar drivers.

Not wanting to re-invent the wheel does anyone know of a design like this that used the P13's and a vifa D25AG35 ?

Thanks !

John in Seattle

chrisb · 29th March 2007, 08:57 PM

Before you expend much time or brain power on this project, have you verified that the pair of P13 magnets won't cause problems with the video display?

johnmark · 29th March 2007, 09:21 PM

The center speaker will sit about 2 below a 52" LCD screen

MJL21193 · 29th March 2007, 09:59 PM

Quote:

Originally posted by johnmark
The center speaker will sit about 2 below a 52" LCD screen

Safe! Only CRT displays are affected by magnets.

chrisb · 29th March 2007, 10:02 PM

the only dumb question is the one that's not spoken

MJL21193 · 29th March 2007, 10:20 PM

Quote:

Originally posted by johnmark
I have a friend (actually my boss0 who wants me to whip up a quick center channel MTM and he wants to use the old Vifa P13WH00 and an aluminum dome in order to match the sound of his mains which use similar drivers.

Not wanting to re-invent the wheel does anyone know of a design like this that used the P13's and a vifa D25AG35 ?

What you want in a centre speaker is midrange clarity, and these drivers excell at that. A small box will do (~15 litres), small 1.5" port around 4" long should give F3 in the 60Hz range. Bass response is secondary in a centre speaker.

Have fun.

johnmark · 29th March 2007, 10:29 PM

Crossed over at 80-90 hz by his HT receiver will probably get by with a sealed config or maybe to make the enclosure even smaller will try aperiodic (leaky box)

johnmark · 30th March 2007, 12:14 AM

In general, is there a specific crossover order that would promote better lateral response with a sideways MTM ?

augerpro · 30th March 2007, 02:10 AM

Quote:

Originally posted by johnmark
In general, is there a specific crossover order that would promote better lateral response with a sideways MTM ?

2.5 way XO will help.

rabbitz · 30th March 2007, 07:17 AM

To maintain tonal balance, base it on the design of his mains, just with a higher F3. A TM may be a better way to go but if power handling and excursion is a problem then MTM or TMM by all means.

29th March 2007, 08:52 PM	#1
johnmark diyAudio Member Join Date: Nov 2004 Location: Seattle	need a quick design for MTM center with P13WH00 I have a friend (actually my boss0 who wants me to whip up a quick center channel MTM and he wants to use the old Vifa P13WH00 and an aluminum dome in order to match the sound of his mains which use similar drivers. Not wanting to re-invent the wheel does anyone know of a design like this that used the P13's and a vifa D25AG35 ? Thanks ! John in Seattle

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29th March 2007, 08:57 PM	#2
chrisb diyAudio Member Join Date: Aug 2002 Location: victoria BC	Before you expend much time or brain power on this project, have you verified that the pair of P13 magnets won't cause problems with the video display?

29th March 2007, 09:21 PM	#3
johnmark diyAudio Member Join Date: Nov 2004 Location: Seattle	The center speaker will sit about 2 below a 52" LCD screen

29th March 2007, 10:02 PM	#5
chrisb diyAudio Member Join Date: Aug 2002 Location: victoria BC	the only dumb question is the one that's not spoken

29th March 2007, 10:29 PM	#7
johnmark diyAudio Member Join Date: Nov 2004 Location: Seattle	Crossed over at 80-90 hz by his HT receiver will probably get by with a sealed config or maybe to make the enclosure even smaller will try aperiodic (leaky box)

30th March 2007, 12:14 AM	#8
johnmark diyAudio Member Join Date: Nov 2004 Location: Seattle	In general, is there a specific crossover order that would promote better lateral response with a sideways MTM ?

30th March 2007, 07:17 AM	#10
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	To maintain tonal balance, base it on the design of his mains, just with a higher F3. A TM may be a better way to go but if power handling and excursion is a problem then MTM or TMM by all means.

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