help needed: Alpair 7 in a large room

KrakBoem · 25th July 2011, 12:42 PM

Hi everyone,

I'm planning to build an Alpair 7 project (Twin Alpair 7 DBR or GR dMar-Ken7) with a subwoofer. I have a large room. That's why I was thinking of the Twin Alpair 7 (Higher SPL). No earthshaking levels requirered. No home cinema use.

The problem I face is room gain. With my current small 2 way BR monitor I made this measurement on listening position (10 feet). Speakers are close to the wall and one is in a corner.

in room 10 feet.jpg

I'm thinking of a Full range + Sub. So my plan is to have an equalized sub and full range main speakers without filtering/EQ. I assume that I have more control over the bass with a sub, because I have more options for room placement and EQ. The position of the main speakers is fixed (after years of negotiations with my wife). I have some more freedom in placing the sub (a marginal result, but it could turn out to be enough).

To have more control over the low frequencies, what is the best solution:
1. Should I go for sealed enclosures instead of BR?

2. Is it possible to design a full range with sealed enclosure without any filtering, and have it roll-off from 200 hz or lower?

Kind regards,

Kees

chrisb · 25th July 2011, 09:45 PM

how large exactly? area / volume if not standard ceiling height / slope etc.

with low frequency support at XO frequencies appropriate to the room, a pair of Alpair 7s per side should be able to satisfy most (sane) musical listening requirements

of course it's possible to size a sealed enclosure for a full range driver to provide acoustical roll-off at a chosen frequency, but it wouldn't necessarily yield the best results at the low extent the driver's pass-band - if at all possible, I'd suggest you consider passive line level XO and active bi-amping

tuxedocivic · 25th July 2011, 10:18 PM

That is quite the room mode. I'd go sealed with both the sub and Alp7s. Eq that huge mode out of the 40 to 80hz range from the sub.

KrakBoem · 26th July 2011, 09:29 AM

My room is 60 square meter (aprox 640 square feet) and 2.6 m high (8.5 feet).

So it will be sealed enclosures and an active subwoofer with EQ. Maybe I'll use a Minidsp for this.

Thanks for your help.

KrakBoem · 26th July 2011, 09:44 AM

No idea where that frowning smiley came from. How do I get rid of that?

pinkmouse · 26th July 2011, 09:51 AM

What frowning smiley?

KrakBoem · 26th July 2011, 11:27 AM

In the title "Help needed"

25th July 2011, 12:42 PM	#1
KrakBoem diyAudio Member Join Date: Oct 2010	help needed: Alpair 7 in a large room Hi everyone, I'm planning to build an Alpair 7 project (Twin Alpair 7 DBR or GR dMar-Ken7) with a subwoofer. I have a large room. That's why I was thinking of the Twin Alpair 7 (Higher SPL). No earthshaking levels requirered. No home cinema use. The problem I face is room gain. With my current small 2 way BR monitor I made this measurement on listening position (10 feet). Speakers are close to the wall and one is in a corner. in room 10 feet.jpg I'm thinking of a Full range + Sub. So my plan is to have an equalized sub and full range main speakers without filtering/EQ. I assume that I have more control over the bass with a sub, because I have more options for room placement and EQ. The position of the main speakers is fixed (after years of negotiations with my wife). I have some more freedom in placing the sub (a marginal result, but it could turn out to be enough). To have more control over the low frequencies, what is the best solution: 1. Should I go for sealed enclosures instead of BR? 2. Is it possible to design a full range with sealed enclosure without any filtering, and have it roll-off from 200 hz or lower? Kind regards, Kees

25th July 2011, 09:45 PM	#2
chrisb diyAudio Member Join Date: Aug 2002 Location: victoria BC	how large exactly? area / volume if not standard ceiling height / slope etc. with low frequency support at XO frequencies appropriate to the room, a pair of Alpair 7s per side should be able to satisfy most (sane) musical listening requirements of course it's possible to size a sealed enclosure for a full range driver to provide acoustical roll-off at a chosen frequency, but it wouldn't necessarily yield the best results at the low extent the driver's pass-band - if at all possible, I'd suggest you consider passive line level XO and active bi-amping __________________ you don't really believe everything you think, do you? community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi

26th July 2011, 09:51 AM	#6
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	What frowning smiley? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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25th July 2011, 10:18 PM	#3
tuxedocivic diyAudio Member Join Date: Jan 2011 Location: Victoria, BC	That is quite the room mode. I'd go sealed with both the sub and Alp7s. Eq that huge mode out of the 40 to 80hz range from the sub.

26th July 2011, 09:29 AM	#4
KrakBoem diyAudio Member Join Date: Oct 2010	My room is 60 square meter (aprox 640 square feet) and 2.6 m high (8.5 feet). So it will be sealed enclosures and an active subwoofer with EQ. Maybe I'll use a Minidsp for this. Thanks for your help.

26th July 2011, 09:44 AM	#5
KrakBoem diyAudio Member Join Date: Oct 2010	No idea where that frowning smiley came from. How do I get rid of that?

26th July 2011, 11:27 AM	#7
KrakBoem diyAudio Member Join Date: Oct 2010	In the title "Help needed"

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