Sealed or vented for the Alpair 7.3 - diyAudio
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Old 5th November 2012, 01:03 PM   #1
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Default 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
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Old 5th November 2012, 07:39 PM   #2
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by nparadis View Post
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.
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Old 5th November 2012, 07:49 PM   #3
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A7.3 sealed sims. 6 litre sealed would be ideal for a pair of woofers XOed at about 95 Hz.

Click the image to open in full size.

dave
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File Type: gif A7g3-sealed.gif (24.4 KB, 989 views)
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Old 7th November 2012, 05:47 AM   #4
11opas is offline 11opas  Canada
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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
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Old 7th November 2012, 05:50 AM   #5
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Go with a single.

dave
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Old 7th November 2012, 09:46 AM   #6
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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
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Old 7th November 2012, 04:17 PM   #7
11opas is offline 11opas  Canada
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Thank you Dave!
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Old 7th November 2012, 05:21 PM   #8
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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
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Old 7th November 2012, 07:49 PM   #9
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by nparadis View Post
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 View Post
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?
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Old 7th November 2012, 11:17 PM   #10
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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.

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