Mark Audio CHR-70 Application Thread - Page 60 - diyAudio
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Old 18th August 2010, 04:47 PM   #591
efluon is offline efluon  Germany
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Could you explain what the bracing on the magnet will do? I'm planning on building a boombox with a tripath and two chr70, using closed 5.5l enclosures, and I'm somewhat surprised by this. If the pressure on the spider is low, won't this produce some buzzing (brace against magnet)?
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Old 18th August 2010, 05:08 PM   #592
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by efluon View Post
Could you explain what the bracing on the magnet will do? I'm planning on building a boombox with a tripath and two chr70, using closed 5.5l enclosures, and I'm somewhat surprised by this. If the pressure on the spider is low, won't this produce some buzzing (brace against magnet)?

Tthe purpose of the "magnet" brace is to provide rigid coupling/ support between the motor assembly (generally the highest mass portion of the driver) and the rear panel, as well as bracing of at least 2 more adjoining panels.

On larger enclosures I like to run this brace vertically the full length of the cabinet (or driver compartment as in attached photo) to couple 4 panels ( front/back/top/bottom), and even include additional side to side bracing.

The trick of course is to cut the magnet brace just exactly tight enough to not stress the driver - this takes some trial and error dry fitting with the driver temporarily installed and before the second side of cabinet is attached.
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Old 18th August 2010, 06:54 PM   #593
efluon is offline efluon  Germany
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thx for the explanation! i think i'll go for a thicker baffle instead (for simplicity and weight)
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Old 18th August 2010, 07:27 PM   #594
chrisb is offline chrisb  Canada
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Originally Posted by efluon View Post
thx for the explanation! i think i'll go for a thicker baffle instead (for simplicity and weight)

that won't really improve the bracing throughout the rest of the box, and depending on the relative thickness of baffle and driver depth, you may need to relieve the back side of cutout with a 45` bevel
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Old 28th August 2010, 06:15 AM   #595
dougr is offline dougr  United States
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Saw a recommendation somewhere on diyaudio for someone to consider the CHR-70 for an outdoor speaker build. Given a suitable (sealed, weatherproof) enclosure what are some of the reasons one would NOT want to try this with the CHR-70?
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Old 28th August 2010, 06:23 AM   #596
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I can't think of any.

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Old 28th August 2010, 03:12 PM   #597
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Default Black Beauty finished

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Old 28th August 2010, 06:03 PM   #598
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Those are pretty

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Old 29th August 2010, 10:46 AM   #599
Henkjan is offline Henkjan  Netherlands
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very nice! my compliments
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Old 19th September 2010, 12:36 AM   #600
jwmbro is offline jwmbro  United States
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Well, I ordered 1 pair CHR and 1 pair CHP, to see which one I prefer.

Anyways, I need/want to have the driver at about 1150mm height, and none of the floorstander designs by planet10 or otherwise have the driver placed nearly high enough - they're obviously all intended for people slumped in low to the ground sofas.
Click the image to open in full size.
Anyways, my plan now is to build a Pensil, but somewhat modified.
I realize there is apparently a new Pensil, which is a lot deeper, but I prefer the sleek skinny one, and it would save me some money in wood.
I'd like to extend the side & back walls downwards by an additional 430mm, adding a front "baffle" to this bottom section, effectively creating a double floor, with a "useless" disconnected chamber at the bottom, which I intend to fill with some heavy material.


Click the image to open in full size.

Not entirely sure which heavy material, perhaps sand or cat litter, and it will probably be a good idea to add a wider base to the bottom, despite all the weight down there - they are after all very thin, and now even taller than usual (1600mm).

I do have a question, seeing as the CHP Pensil design is mentioned but not actually linked to a construction sketch on the planet10 site - am I right in assuming that this would basically be the same, only it needs to be a few cm longer to account for the slighly lower Fs of the paper cone?

Thanks for hosting the plans, dave, I'm looking forward to these speakers. Is the filter recommended, or just a suggestion if the normal sound doesn't appeal?

I should also clarify - my other option is an mMarS - I think even the old Pensil should outdo that in terms of LF response?

Last edited by jwmbro; 19th September 2010 at 12:41 AM.
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