Mark Audio CHR-70 Application Thread - Page 19 - diyAudio
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Old 16th May 2009, 03:13 PM   #181
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Default Re: Re: Re: Re: italynstylion

Quote:
Originally posted by gychang



where can I find the detailed drawing/scale for this?

gychang

Dave posted it here... http://homepage.mac.com/tlinespeaker...map-130409.pdf
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Old 17th May 2009, 12:59 PM   #182
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which is the simulated frequenct response for the chr-70 in the lotus, any graph? except for power-handling will it change much using one or two drivers?

congratulations, i really like the design, i'm already ordering a pair of drivers
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Old 31st May 2009, 08:07 PM   #183
liasom is offline liasom  United States
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Default CHR-70 Nearfield

Got my pair of CHR-70 drivers from alpair-usa.com. 61 bucks and really nice! Thank you, Mark.

It's enclosure time. Need to do some cutting and gluing and finishing. But I can't make up my mind.

Requirements are for nearfield use at my PC workstation with a NAD 7225PE receiver as power AND in keeping with the spirit of Mark's reason for developing these drivers--low budget and simple. So a pair of CHR-70s is all that is going to be used. I need to keep the enclosures to a reasonable size since they'll be on my desk. Ah, a pair of Lotus would be great in that corner office I covet, but that is not in my reality right now.

I've modeled enclosures at 10 liters BR tuned to 51 Hz and sealed 9.5 liters. Both with appropriate damping material. I know each type of system have their advantages and disadvantages, but nearfiled is new to me. I'll probably never drive the system to high SPL since it is nearfiled.

I really don't want to build both. I know I could compromise and build the 10 liter BR enclosure to use for both and experiment (seal the ports or not, adjust the stuffing...) but I'd rather settle into a decision before that to keep this simple.

So, your opinions are welcomed on what type of enclosure would be best for nearfield use. Sealed and BR enclosures are the only types I've ever built, I've never built a system for nearfiled use--so those two facts may be a constraint as far as keeping this simple. Also, I promise I'll document the build (when I make up my mind and actually start) for anyone else looking for this kind of nearfield solution.
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Old 31st May 2009, 08:14 PM   #184
Henkjan is offline Henkjan  Netherlands
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if you have the space for the 10 liters, buid that and stuf the port according to your taste... if a smaller would suit yr desk more, you could try the 4 liter closed with high pass cap that I built (on page 5 of this thread)
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Old 31st May 2009, 10:01 PM   #185
liasom is offline liasom  United States
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Default Add to post 183 (CHR-70 Nearfield)

Thanks, Henkjan. Your post reminds me that I forgot to mention that I plan to build the enclosures and then measure the system frequency response after placement at my desk. I have a dual monitor setup so the right channel speaker will be closely sandwiched in between two large flat surfaces--one straight in front of me in between the two speakers and one outside the right speaker angled toward my right ear--and I know that will have an effect on frequency response.

So, regarding appropriate filters. I'm hoping that the loudness contour on the NAD 7225PE will work as a sort of el-cheapo BSC if I need that. Regarding adding components for BSC or contour filters, I'm hoping they will not be needed, but I'm willing to go to that expense if the result is that I'll gain a significant improvement in sonic quality.
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Old 1st June 2009, 11:45 AM   #186
Henkjan is offline Henkjan  Netherlands
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what do you use as source? the PC? then you could probably do all the EQ your heart wants....
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Old 1st June 2009, 06:03 PM   #187
dede is offline dede  France
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Hello,

What is to your point the smallest closed enclosure that i could use for this driver ?

Thanks

Anthony
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Old 1st June 2009, 06:13 PM   #188
Henkjan is offline Henkjan  Netherlands
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if you apply a condensator as I have done in the BlackBeauty design, than you could go down to 2 liters (at the cost of some low end output)
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Old 1st June 2009, 07:09 PM   #189
dede is offline dede  France
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Thanks
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Old 6th June 2009, 10:44 PM   #190
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If anyone is interested in EnABL'ing their CHR70, Dave and a few lucky other Canadians have begun listening to an EnABL'd pair in a sealed enclosure and their comments are posted in this thread about FR drivers for a SE amp. They're very positive about the improvement in SQ.

I think I'll start looking for a woofer to pair with my CHRs after they're EnABL'd.
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