Go Back   Home > Forums > Commercial Sector > Manufacturers > Markaudio

Markaudio Designers and builders of audiophile grade drivers

Reply
 
Thread Tools Search this Thread
Old 8th April 2012, 02:01 AM   #1
diyAudio Member
 
Bob Brines's Avatar
 
Join Date: Jan 2003
Location: Hot Spring Village AR
Default Driver Total Volume

I am contemplating putting an A7.3 in a small sealed box. The volume of the motor and frame become significant. Eyeballing the diagram of the A7.3 suggests that this volume could be as much as 1/4L. Anyone have an exact number for this and the other Alpair drivers?

Bob
  Reply With Quote
Old 8th April 2012, 04:47 AM   #2
diyAudio Member
 
markaudio's Avatar
 
Join Date: Nov 2008
Quote:
Originally Posted by Bob Brines View Post
I am contemplating putting an A7.3 in a small sealed box. The volume of the motor and frame become significant. Eyeballing the diagram of the A7.3 suggests that this volume could be as much as 1/4L. Anyone have an exact number for this and the other Alpair drivers?

Bob
Hi Bob,
You might want to consider taking the rear magnet cover off. I haven't done any recent volumetric calcs for the Alp7 Gen.3 but I'd suggest allowing 0.2 litres (rear cover off). How small a sealed box volume do you intent using?

Thanks
Mark.
  Reply With Quote
Old 8th April 2012, 03:37 PM   #3
diyAudio Member
 
Bob Brines's Avatar
 
Join Date: Jan 2003
Location: Hot Spring Village AR
Mark,

I'm looking at a Qtc=1.0 sealed box. That figures to be a net 1.2L. I plan to high-pass it well above Fc, so back pressure shouldn't be an issue. I like Qtc=1 because it makes over excursion a not issue.

Bob
  Reply With Quote
Old 8th April 2012, 07:51 PM   #4
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Bob,

I have an estimate in one of my drawings. But easier to re-esimate -- and show how. See diagram.

A sealed box is quite non critical of volume and the nature of the damping will alter the effective volume.

I suggest that leaving the extra magnet on the driver to eat up some volume, will help in getting a box this small to have reasonable depth given that the driver bezel will determine the minimum WxL. You might even need to add blocks inside for that purpose.

For this kind of ap i'd be tempted to take the tape measure and calculator down to the dollar store and go looking at appropriately sized dishes or "tupperware", or the garden shop for ceramic pots.

dave
Attached Images
File Type: gif est-volume-of-A7.gif (29.8 KB, 108 views)
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 8th April 2012, 10:57 PM   #5
diyAudio Member
 
markaudio's Avatar
 
Join Date: Nov 2008
Quote:
Originally Posted by Bob Brines View Post
Mark,

I'm looking at a Qtc=1.0 sealed box. That figures to be a net 1.2L. I plan to high-pass it well above Fc, so back pressure shouldn't be an issue. I like Qtc=1 because it makes over excursion a not issue.

Bob
Hi Bob,
Sounds interesting. Are these are satellites for Home Theatre, or desktop?
Dave's post is very helpful - thanks.

Cheers
Mark.
  Reply With Quote
Old 9th April 2012, 01:12 AM   #6
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
I also have a couple of A7 that are beyond redemption -- one that the client damaged the cone on and the VC now rubs. I could so an imersion test and get a more accurate number, but the extra decimal place is unlikely to be all that useful when one considers the parameter deltas across multiple units.

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
Old 9th April 2012, 01:16 AM   #7
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally Posted by markaudio View Post
Are these are satellites for Home Theatre, or desktop?
I suspect Bob's continued exploration of FAST,

My New Dipoles

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


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to Calculate volume of enclosure for a mid-range driver? kevinlin1013 Multi-Way 3 4th January 2011 08:28 PM
Driver and enclosure for 4 watt amp, 12x12 room, moderate volume chamber music? zenga123 Full Range 55 16th December 2010 02:06 PM
Volume of driver and plate amp? Lewis Moon Subwoofers 1 29th October 2008 07:39 AM
Ideal volume for two Vifa Pl18 driver andy2 Multi-Way 0 26th December 2005 03:24 PM
Finding the volume of a driver wigginjs Multi-Way 9 7th April 2004 10:31 PM


New To Site? Need Help?

All times are GMT. The time now is 08:13 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2