Mark Audio CHR-70 Application Thread - Page 6 - diyAudio
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Old 11th April 2009, 07:46 PM   #51
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Quote:
Originally posted by italynstylion
Here is the dual driver BR bookshelf design....plan-chr70-till-2-70
That box could use some detail tweaking. And i'd mount the 2nd driver on the top or side.

dave
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Old 11th April 2009, 08:42 PM   #52
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Quote:
Originally posted by planet10


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
I understand what you're saying. The GFA5400 is 2x125W and the preamp is scaled to get every watt at 10/10ths. I've never owned a set of speakers that could handle the full output. I actually have a pair of Pass Labs Zen v1 PCBs that I need to build. Do you think that might be a nice match for the CHR-70s?
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Old 11th April 2009, 08:49 PM   #53
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Yup.
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Old 11th April 2009, 09:18 PM   #54
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Quote:
Originally posted by HareBrained
I actually have a pair of Pass Labs Zen v1 PCBs that I need to build. Do you think that might be a nice match for the CHR-70s? [
Yes, nicer than the Adcom

dave
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Old 11th April 2009, 11:12 PM   #55
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Quote:
Originally posted by planet10


That box could use some detail tweaking. And i'd mount the 2nd driver on the top or side.

dave

What detail tweaking would you recommend? As for driver placement, what would be the differences between mounting the second driver on the top vs. on the side? I worried about there not being enough port area for the drivers but I wasn't sure if I was right about that. Also, their suggested filter on those plans, do you guys know what it does?
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Old 12th April 2009, 08:03 PM   #56
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Quote:
Originally posted by planet10


That box could use some detail tweaking. And i'd mount the 2nd driver on the top or side.

dave
Dave,

What's your opinion of using a 1.5-way crossover for the dual driver arrangement? My understanding would be that a single coil between the series drivers would provide BSC (assuming the speakers are in needed) and a LP filter below the critical frequencies.

John
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Old 13th April 2009, 05:06 AM   #57
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Does it not essentially create an almost 1.5 way if you simply mount the 2nd full range speaker away from the listening position, ie on the side or top as suggested?
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Old 13th April 2009, 05:16 AM   #58
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Does it not essentially create an almost 1.5 way if you simply mount the 2nd full range speaker away from the listening position, ie on the side or top as suggested?
Yes, that is the idea.

dave
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Old 13th April 2009, 07:45 AM   #59
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Quote:
Originally posted by italynstylion
What detail tweaking would you recommend? As for driver placement, what would be the differences between mounting the second driver on the top vs. on the side?
I'd reorient the bracing... a shelf brace is the least effective. A brace should divide a panel into new subpanels with a higher aspect ratio.

Driver on the side wouldn't suffer from gravity, but in the end it depends on room placement. With careful consideration this box is small enuff to be converible.

dave
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Old 13th April 2009, 05:05 PM   #60
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From what you've mentioned, I think I'll opt for putting the second driver on the side.
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