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-   -   Sealed or vented for the Alpair 7.3 (http://www.diyaudio.com/forums/markaudio/222930-sealed-vented-alpair-7-3-a.html)

nparadis 5th November 2012 02:03 PM

Sealed or vented for the Alpair 7.3
 
Hi everyone,

I just ordered a pair of Alpair 7.3. They will be matched with a pair of 10" Dayton subs (powered and sealed).

I read a lot of info in the forums on the 7.3 but I still have to decide between sealed or vented box for the Alpair. They will powered by a SS 70 watts amp.

I am leaning for a sealed 6 lit enclosure. Advantage I see : better cone control, less bass response (bass covered by the subs).

I would like to read som ideas on this.

Thanks in advance !


Nelson Paradis

chrisb 5th November 2012 08:39 PM

Quote:

Originally Posted by nparadis (Post 3228969)
Hi everyone,

I just ordered a pair of Alpair 7.3. They will be matched with a pair of 10" Dayton subs (powered and sealed).

I read a lot of info in the forums on the 7.3 but I still have to decide between sealed or vented box for the Alpair. They will powered by a SS 70 watts amp.

I am leaning for a sealed 6 lit enclosure. Advantage I see : better cone control, less bass response (bass covered by the subs).

I would like to read some ideas on this.

Thanks in advance !


Nelson Paradis


Well, not so much an "idea", but my own personal experience is that the larger Alpairs (7 cm & up) work very well in vented enclosures, even those smaller than required for widest bandwidth. As Dave corrected me elsewhere, the little center channel enclosure he sketched up for the 7 was 9liters (approx 460mm W x 202mm D x 160mm H). This might not model or extend as deeply in real world measures as say the Pensil for same driver - but for its intended use, the bass response is more than adequate for my listening levels. Dimensions were tailored for shortest height (narrow width if turned upright), and could no doubt be adjusted for wider aspect ratio, with corresponding adjustment to vent tuning .

Then there are several more conventional (i.e. round ports) BR designs on Mark's site.

If you do go sealed, I'm wondering if 6 liters might be small enough to constrain dynamics and even contribute to some vocal range congestion if shallow - the latter is something I've certainly encountered with other drivers, regardless of net enclosure volume and venting schemes.

planet10 5th November 2012 08:49 PM

1 Attachment(s)
A7.3 sealed sims. 6 litre sealed would be ideal for a pair of woofers XOed at about 95 Hz.

http://www.diyaudio.com/forums/attac...1&d=1352148526

dave

11opas 7th November 2012 06:47 AM

I am building a center channel for my HT with the Alpair 7.3... Should I twin the drivers side by side, or just go with the single? It will be a sealed enclosure, XOed with subs around 100hz.

I realize this has been debated several times on this forum: Twin vs Single driver for Center Channel and suggested combing issues, but can't really find a concrete answer... If someone has tried and tested this, please help. THANKS

planet10 7th November 2012 06:50 AM

Go with a single.

dave

nparadis 7th November 2012 10:46 AM

Hi,

Has anyone experimented with the A7.3 sealed ? The curbs shows a good matching with a suwoofer. However, do we loose much dynamics with a sealed vs vented box.

If I go vented, I think I would make the GR dmark7.3 2V1, probably with a rear vent.

Thanks

Nelson

11opas 7th November 2012 05:17 PM

Thank you Dave!

planet10 7th November 2012 06:21 PM

As far as dynamics and sealed ot vented go, it depends on what you are feeding it. If you go vented and feed it stuff below the tuning frequency the flapping around of the driver can really sap dynamics.

dave

chrisb 7th November 2012 08:49 PM

Quote:

Originally Posted by nparadis (Post 3231857)
Hi,

Has anyone experimented with the A7.3 sealed ? The curbs shows a good matching with a suwoofer. However, do we loose much dynamics with a sealed vs vented box.

If I go vented, I think I would make the GR dmark7.3 2V1, probably with a rear vent.

Thanks

Nelson

I'd be careful about venting too close to a back wall



Quote:

Originally Posted by planet10 (Post 3232370)
As far as dynamics and sealed ot vented go, it depends on what you are feeding it. If you go vented and feed it stuff below the tuning frequency the flapping around of the driver can really sap dynamics.

dave

of course when using an HT receiver with full DSP XO & EQ, this should not be a problem

personally, I'd go for vented for both the center and L&R fronts - well, actually I did over a year ago, and haven't smoked any of 'em yet


Dave - what is the tuning frequency of the dMar-Ken7 Center?

nparadis 8th November 2012 12:17 AM

My system is not HT, just stereo. The a7.3 will receive "straight pipe" no restriction signal. Unless I put some kind of high pass filtering.

Nelson


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