Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Mark Audio CHR-70 Application Thread
Mark Audio CHR-70 Application Thread
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th March 2014, 08:33 AM   #831
Honkey is offline Honkey  Australia
diyAudio Member
 
Join Date: Feb 2011
Location: Melbourne
Quote:
Originally Posted by planet10 View Post
Richard,

Took you awhile

Longer vents will tune a bit lower.

dave
Hi Dave.

It took a long time for me to decide which box to build the CHR-70's into with the many designs available and then even longer to start building. I'll chamfer the corners soon to get the correct port length. Would there be any benefit in slightly angling the internal bracing panel to help reduce the standing waves between the parallel vertical surfaces?

Thanks, Richard.
  Reply With Quote
Old 15th March 2014, 09:44 AM   #832
Honkey is offline Honkey  Australia
diyAudio Member
 
Join Date: Feb 2011
Location: Melbourne
Quote:
Originally Posted by planet10 View Post
Richard,

Took you awhile

Longer vents will tune a bit lower.

dave
Hi Dave.

It took a long time for me to decide which box to build the CHR-70's into with the many designs available and then even longer to start building. I'll chamfer the corners soon to get the correct port length. Would there be any benefit in slightly angling the internal bracing panel to help reduce the standing waves between the parallel vertical surfaces?

Thanks, Richard.
  Reply With Quote
Old 16th May 2014, 08:12 PM   #833
Skilfing is offline Skilfing  Germany
diyAudio Member
 
Join Date: May 2014
Hi guys,

I plan on building PC Speakers as my first DIY project. I came across the CHR70 as they seem to offer very good value for money. Being a fairly tall person I need the driver to be roughly 45-50cm higher than my table but the speakers should be much higher than 60-65cm. An online simulation told me that the speaker would work "best" in a 15-17 liter bass reflex box in my situation.

After searching for a while, this design is the one that comes closest to my requirements.

- Do you think I can increase the height of the box and reduce its depth without reducing the quality of sound?
- Do you happen to know any other plans that meet my requirements?

As a rock and metal fan who likes bass but does not want to use a sub I also found the Cube Audio F155 to be a very appealing alternative, especially because of its much lower resonance frequency.

- Do you have any thoughts on how to decide between the CHR70 and the F155?

Your help is much appreciated

Regards

Florian
  Reply With Quote
Old 16th May 2014, 08:57 PM   #834
chrisb is online now chrisb
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Florian - while it's normally considered feasible to adjust the ratio of dimensions in a conventional BR box while retaining the net internal volume and vent tuning, there are a couple of things to consider:
- the plastic frame bezel on the CH series are approx 123mm, so there's a practical limit to how narrow you can go with your baffle and avoid constriction of the side panels - the narrowest I've ever used for this driver is 140mm internal width ( FH3)
- compressing the WxD ( CSA) and extending the height can transition the operation of the box from a theoretical BR to quarter wave action ( MLTL), wherein driver and port placement become more significant

The Mark9 designs looks like a fairly straightforward BR which should perform quite well with the CHR70, but if you read further up in this thread, you'll note there are quite a range of enclosures for this driver, from smaller desk top to floorstanders. If your application can accommodate something like the Pensil or FH3, I'd wager you'll get much better bass extension and dynamics than any of the smaller designs.
__________________
like my mind, this space intentionally blank
  Reply With Quote
Old 17th May 2014, 08:55 AM   #835
Skilfing is offline Skilfing  Germany
diyAudio Member
 
Join Date: May 2014
Thanks for the quick reply! I enclosed a small sketchup of my listening situation. I entirely agree that a Pensil or Tuby would increase bass extension and dynamics compared to smaller designs noticeably. As you can see on my room plan I have space to accommodate bigger designs but I am concerned about two things:
a) the stereo-triangle would not be optimal, because the speakers are far away from each other but I am rather close to them and
b) the desk I am sitting at is massive - so there is no straight line between the end of the tube near the floor and my ears.

Given a) and b) I thought going for speakers on the desk would be necessary.

When you look at the room plan, what are your thoughts on that?

Regards

Florian
Attached Images
File Type: png my_room.png (20.7 KB, 584 views)
  Reply With Quote
Old 25th May 2014, 10:48 AM   #836
Skilfing is offline Skilfing  Germany
diyAudio Member
 
Join Date: May 2014
bump - would be very interested in your opinions on how to best include the CHR70 in my room layout
  Reply With Quote
Old 25th May 2014, 05:43 PM   #837
chrisb is online now chrisb
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
First thought would be to suggest a narrow profile floorstander such as Pensil, but that would place the driver centre at approx 740mm from floor - most likely right at work surface height. You could raise them with a false bottom or separate stand, but Scott would no doubt say some thing like "at the risk of sacrificing some of the floor boundary coupling that is part of the design calculus" . Neither can the driver location or internal height be "stretched" to suit aesthetics - that is, without turning it into something else that may or not sound fine.

Any of the smaller desk-top enclosures would be a reasonable alternative. Of course they wouldn't develop the same bass extension, but a separate woofer could always be added should that prove to be a major shortcoming. FWIW, In both my "desk-top" set-ups, I like to raise the enclosures at least 6"
__________________
like my mind, this space intentionally blank
  Reply With Quote
Old 25th May 2014, 06:31 PM   #838
zman01 is offline zman01  Bangladesh
diyAudio Member
 
Join Date: Feb 2011
Location: Dhaka
Mark Audio CHR-70 Application Thread
Florian,

If you have not got the CHR-70, then you might consider picking up the CHP-70 Gen-1 if still available with one of the dealers in Europe. The paper is softer and probably will be more suitable to listen to in semi-nearfield setup.

But then, we would not be discussing a "CHR-70 application", would we?
  Reply With Quote
Old 25th May 2014, 06:55 PM   #839
planet10 is offline planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Mark Audio CHR-70 Application Thread
Quote:
Originally Posted by zman01 View Post
If you have not got the CHR-70, then you might consider picking up the CHP-70 Gen-1
+1

CHP-70 Gen1 (pair) - RumoH - Caps, coils and speakers

Click the image to open in full size.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote

Reply


Mark Audio CHR-70 Application ThreadHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
need great smd cap for audio application jsaggio Parts 1 11th September 2007 03:41 AM
CV4014 and 5650 - any audio application of these tubes? cm Tubes / Valves 0 18th January 2007 12:03 PM
Additional application for audio amps... ashok Everything Else 8 17th August 2005 08:20 AM


New To Site? Need Help?

All times are GMT. The time now is 07:37 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki