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

ROAR with Helmholtz front resonator
ROAR with Helmholtz front resonator
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 17th June 2019, 06:04 PM   #101
kjez is offline kjez
diyAudio Member
 
Join Date: Feb 2016
Quote:
Originally Posted by Circlomanen View Post
Attachment 763483

The Dayton Audio RSS210HO-4 seems to be reasonable suitable for a small compact HROAR-8 design. I have not made any drawing yet. This is just a first feasibility test in Hornresp, and I have not optimized it much.
Small drivers tend to get more pronounced peaks in the response graph, but this is not something I worry much about. DSP is cheap and room acoustics is usually much worse.
Thanks, Circlomanen for simulating the driver. Very nice of you!

It's hard on what kind of driver to chose (especially on a tight budget)
Found this one which is kinda cheap but seems to perhaps fit for this kind of enclosure?
JBL Club 1024 10" component subwoofer with switchable 2- or 4-ohm impedance at Crutchfield.com

Or is there something else in 8"-10" range for approx. 1000 SEK (100 EUR) which would do?

(Its available at BRL as well but they don't provide as many parameters)
  Reply With Quote
Old 17th June 2019, 07:03 PM   #102
Circlomanen is offline Circlomanen  Sweden
diyAudio Member
 
Join Date: Sep 2004
Location: Göteborg
Quote:
Or is there something else in 8"-10" range for approx. 1000 SEK (100 EUR) which would do?
I must say that the GAS ALPHA10D2 is a bargain! It is a nice and capable driver and very suitable for HROAR designs. Once the summer sale starts, it will usually go for around 500 SEK a piece. You want quite low Qts, high Bl and low Vas.
__________________
We live in a horizontal world, why use vertical topologies???
  Reply With Quote
Old 17th June 2019, 07:16 PM   #103
kjez is offline kjez
diyAudio Member
 
Join Date: Feb 2016
Quote:
Originally Posted by Circlomanen View Post
I must say that the GAS ALPHA10D2 is a bargain! It is a nice and capable driver and very suitable for HROAR designs. Once the summer sale starts, it will usually go for around 500 SEK a piece. You want quite low Qts, high Bl and low Vas.
Ok, will wait for the summer sale then
  Reply With Quote
Old 17th June 2019, 10:31 PM   #104
kipman725 is offline kipman725  United Kingdom
diyAudio Member
 
kipman725's Avatar
 
Join Date: Jun 2007
Location: Warrington
Send a message via MSN to kipman725
Quote:
Originally Posted by kjez View Post
Ok, will wait for the summer sale then
If you check ebay for used car subs you can get quite high performance units like the alpine type R for little money. (if your able/willing to collect).
  Reply With Quote
Old 18th June 2019, 08:14 AM   #105
Circlomanen is offline Circlomanen  Sweden
diyAudio Member
 
Join Date: Sep 2004
Location: Göteborg
Alpine Type R are nice drivers, but much to weak for this kind of enclosure.

Aim for a Qts of 0,3 or less. Below 0,2 is even better. Bl is king! B&C 18IPAL, Ground Zero GZNW 38NEO-SPL and GAS COMP12D1 are very good drivers for high powered high order QW bandpass enclosures.

GAS Alpha10D2 is a nice and suitable budget oriented driver. B&C 12TBX100 would be a great 12 inch alternative for professional use.

The geometry of a simple to build HROAR tends to favor drivers with low Qts and Vas and high Mms in order to keep the pipe cross section reasonably small, or it will take valuable volume from the Helmholtz front chamber. Isobaric loading of two drivers can be advantageous to increase Bl and Mms, but the large protruding magnets tends to get in the way when trying to get a good layout and a rational build without to many special solutions.
__________________
We live in a horizontal world, why use vertical topologies???
  Reply With Quote
Old 22nd June 2019, 06:38 PM   #106
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
ROAR with Helmholtz front resonator
hi Circlomanen, Moray James mentioned his K-t-line variant of the Karlson from about 15 years and I thought it might sim in the low end like your ROAR. Do you think a "ballpark" sim could be made of this style cabinet using hornresp and if so, how would you lay it out?

Click the image to open in full size.
  Reply With Quote
Old 22nd June 2019, 07:45 PM   #107
BP1Fanatic is offline BP1Fanatic  United States
diyAudio Member
 
BP1Fanatic's Avatar
 
Join Date: Jan 2009
Location: Columbus, Ohio
Shoot, does HR have enough segments to use the TH function for that enclosure?

I think I see at least 7 segments.

Last edited by BP1Fanatic; 22nd June 2019 at 07:49 PM.
  Reply With Quote
Old 23rd June 2019, 06:25 PM   #108
snappyturtle is online now snappyturtle  United States
diyAudio Member
 
Join Date: Jan 2014
if the cross section of the segments are the same, or if the taper is consistent throughout HR should take care of it just fine.
  Reply With Quote
Old 23rd June 2019, 11:51 PM   #109
bjohng is offline bjohng  United States
diyAudio Member
 
Join Date: Aug 2005
This MCM driver has been mentioned many times in other configurations. It looks like a pair of these would fit the requirements for HROAR in a residential setting.

https://www.newark.com/mcm-audio-sel...rms/dp/88C7835
__________________
bjohng
  Reply With Quote
Old 24th June 2019, 01:55 PM   #110
BP1Fanatic is offline BP1Fanatic  United States
diyAudio Member
 
BP1Fanatic's Avatar
 
Join Date: Jan 2009
Location: Columbus, Ohio
It's been awhile since I've seen a build with that speaker. Are they still using them on BFM's website?
  Reply With Quote

Reply


ROAR with Helmholtz front resonatorHide 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
Helmholtz Resonator Inside a Sealed Cabinet T101 Multi-Way 24 6th June 2019 06:41 PM
formula for Q of Helmholtz resonator PeteMcK Everything Else 9 18th September 2012 02:12 PM
Helmholtz Resonance (again) chairforce Multi-Way 6 26th June 2010 04:31 AM
Cabinet brace act as helmholtz resonator? RyanW Multi-Way 17 2nd October 2007 11:08 PM
To Roar Malmin Washo Introductions 1 16th September 2006 07:22 PM


New To Site? Need Help?

All times are GMT. The time now is 02:51 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki