Mark Audio CHR-70 Application Thread - Page 5 - diyAudio
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Old 10th April 2009, 10:43 PM   #41
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Calhoun has one forward and one sideways firing driver. Both forward firing was optional as it was designed for the CSS WR125 wideband unit, to be partnered with a supertweeter, & one to be rolled off above its mass corner.
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Old 10th April 2009, 11:00 PM   #42
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Quote:
Originally posted by italynstylion
You mentioned the Calhouns but they have 2 drivers in the front baffle even though Scott said this was a bad idea.
The only pairs that have been built have 1 on the side & 1 on the front and an MTM... 2 FR125SR on the front is not recommende. The 2 on the front was for use as an MTM or as a 1.5 way (box done for WR125 originally, so they have a tweeter)

Attached are the options we proposed for driver mounting.

dave
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File Type: gif calhoun-variants.gif (49.6 KB, 2180 views)
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Old 10th April 2009, 11:02 PM   #43
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The original Calhouns
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File Type: jpg calhouns-and-shadow.jpg (56.2 KB, 2258 views)
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Old 10th April 2009, 11:06 PM   #44
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and the MTM
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Old 11th April 2009, 12:11 AM   #45
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I'm finally sitting in front of, and listening to, my dual chamber reflex CHR-70's...

These speakers are incredible, even in their fresh out of the box state. The midrange is excellent and the treble is very articulate. The midbass is a little "slow" but the depth of output is better than expected. They're already showing the limitation of the source material (MP3s). I can't wait until they break in.

I think the enclosure choice was a good one. I took pictures and will post them when available. I used slots for all 3 ports. I choose an internal depth that was equal to the ports width. The 2 external ports exit on the side, and the crossover port is the entire divider between the two chambers. Overall dimensions are 21.5"x8.5"x5". I used 0.5" materials throughout. The driver frame is quite thick and thus I decided flush mounting would not have left enough material to support the driver. I really should have used 0.75" for the baffle. Next time. More details will accompany the pictures.

Thanks Mark Audio for putting out such a great driver at such a great price.
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Old 11th April 2009, 04:25 AM   #46
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Quote:
Originally posted by HareBrained
I'm finally sitting in front of, and listening to, my dual chamber reflex CHR-70's...

These speakers are incredible, even in their fresh out of the box state. The midrange is excellent and the treble is very articulate. The midbass is a little "slow" but the depth of output is better than expected. They're already showing the limitation of the source material (MP3s). I can't wait until they break in.

I think the enclosure choice was a good one. I took pictures and will post them when available. I used slots for all 3 ports. I choose an internal depth that was equal to the ports width. The 2 external ports exit on the side, and the crossover port is the entire divider between the two chambers. Overall dimensions are 21.5"x8.5"x5". I used 0.5" materials throughout. The driver frame is quite thick and thus I decided flush mounting would not have left enough material to support the driver. I really should have used 0.75" for the baffle. Next time. More details will accompany the pictures.

Thanks Mark Audio for putting out such a great driver at such a great price.

What are you driving them with?
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Old 11th April 2009, 04:49 AM   #47
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Awesome! Glad to hear they are working well for you. This makes me excited to hear what they have in store for me.

Someone on the first page mentioned a BR design they heard with two drivers and dual ports on the front baffle. I emailed Alpair and they sent me the design PDF file. It's pretty much what I was going to do on my own but uses smaller ports. It also has a suggested crossover to try. I'm not sure how the suggested crossover effects the FR though.

EDIT: The site wont let me attach the PDF because it's too big. I'd share it with you guys but I have no idea how.
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Old 11th April 2009, 05:38 AM   #48
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Quote:
Originally posted by type



What are you driving them with?
Nothing special. Adcom GFA5400 and GTP-450 preamp. Too much power really. Of the 10 marks on the volume pot, I can only go just above the first.
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Old 11th April 2009, 07:18 PM   #49
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Here is the dual driver BR bookshelf design. I found it on their website.

http://markaudio.com/sites/all/files...-till-2-70.pdf



I might end up doing that. My friend wants a smaller system that wont take up too much space and whatnot. He's not crazy like all of us here.

I'd like to try the calhoun on my own though after I finish the bookshelf speakers for him. If the driver impresses me enough I'd try them out for myself for sure.


The drivers actually came in the mail yesterday. Here are some pictures of them.

Click the image to open in full size.
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Old 11th April 2009, 07:44 PM   #50
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Quote:
Originally posted by HareBrained
Too much power really. Of the 10 marks on the volume pot, I can only go just above the first.
Not necessarily too much power. Certainly too much gain. You need to sort that, down there is were volume controls are at their worst.

dave
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