Peerless 830875 in sealed box - Page 2 - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 26th December 2010, 10:06 PM   #11
diyAudio Member
 
Join Date: Jun 2010
@sreten: The enclosures I have now are bass reflex. I want to try a sealed enclosure for the reasons mentioned earlier, which left me very curious.

@DualTriode: I think the same way as you. I prefer the sound of sealed enclosures. And for that, I have two 15-inch subwoofers. But on the other hand, I like to use the Peerless, Without the Urgent Need for subs. As well I said before, I do not look good bass in them. Just looking for a bass that accompanies it. The only thing that interests me is that I can hear the range of 55-65Hz in a fairly decent way. It is not my intention to get more down in frequency with these monitors.
  Reply With Quote
Old 26th December 2010, 10:08 PM   #12
sreten is online now sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

F3 is not the issue, F6 and F10 matter far more in reality, and
optimising for these gives you a far better transient response.

This driver in small sealed will not have good bass, vented
done properly IMO will get down to 40Hz or so with a large
maximum SPL / lower distortion advantage, I cannot see
in this case sealed being preferable in any sensible sense.

rgds, sreten.

I've got nothing against sealed, but not these drivers without a sub.
Detuning your ports with a foam lining is by far IMO your best bet.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 26th December 2010 at 10:13 PM.
  Reply With Quote
Old 26th December 2010, 10:59 PM   #13
diyAudio Member
 
Join Date: Aug 2009
Location: Sacramento
Quote:
Originally Posted by ramiro77 View Post
@sreten: The enclosures I have now are bass reflex. I want to try a sealed enclosure for the reasons mentioned earlier, which left me very curious.

@DualTriode: I think the same way as you. I prefer the sound of sealed enclosures. And for that, I have two 15-inch subwoofers. But on the other hand, I like to use the Peerless, Without the Urgent Need for subs. As well I said before, I do not look good bass in them. Just looking for a bass that accompanies it. The only thing that interests me is that I can hear the range of 55-65Hz in a fairly decent way. It is not my intention to get more down in frequency with these monitors.
Hello,
I will jump in with more opinion.
It depends on time place and purpose. Mood music for the women in your life does not need chest pounding bass decibels.
Here is a thought: build the bass reflex boxes and provide the ability to blank off the ports for the times you may want to roll into the 15 inch bins.
Something you likely already have in mind is the “cabin effect”. Moderate to smallish rooms have the bass increase in real db’s due to the relationship between the wavelength and room size.
The Peerless may perform better than they appear on paper in the real space.
DT
All just for fun!
  Reply With Quote
Old 27th December 2010, 04:31 AM   #14
diyAudio Member
 
Join Date: Jun 2010
I like the idea of making a new bass reflex, with the possibility of plugging the ports. Could make about 13 liters, maybe a little less, to work well in both bass reflex and sealed when I plug in ports. To compensate for the decrease in size in bass reflex mode, I can try tuning the port at 50-53Hz. 40hz tune to me seems crazy, the group delay is very high.
  Reply With Quote
Old 27th December 2010, 05:11 AM   #15
diyAudio Member
 
Join Date: Aug 2009
Location: Sacramento
Quote:
Originally Posted by ramiro77 View Post
I like the idea of making a new bass reflex, with the possibility of plugging the ports. Could make about 13 liters, maybe a little less, to work well in both bass reflex and sealed when I plug in ports. To compensate for the decrease in size in bass reflex mode, I can try tuning the port at 50-53Hz. 40hz tune to me seems crazy, the group delay is very high.
Hello,
The Madisound bass-reflex recommendation tuned to 53 Hz is 12 L.
I was thinking more of a cap (rather than a plug) with 2 to 4, ¼-20 cap screws with a T-nut like this pressed in the inside of the box.
T Nuts, Insert Nuts, Propell Nuts, Weld Nuts
DT
All just for fun!
  Reply With Quote
Old 27th December 2010, 05:17 AM   #16
diyAudio Member
 
Join Date: Jun 2010
It´s a good idea too. Tomorrow i´ll start with the enclosures. Thanks for the tips
  Reply With Quote
Old 27th December 2010, 07:41 AM   #17
diyAudio Member
 
jerome69's Avatar
 
Join Date: Feb 2008
Location: Lyon
An alternative could be an aperiodic box
  Reply With Quote
Old 27th December 2010, 05:45 PM   #18
diyAudio Member
 
mondogenerator's Avatar
 
Join Date: Sep 2009
Location: City Of Villans
Blog Entries: 1
Quote:
Originally Posted by ramiro77 View Post
With good bass I make reference to something that it accompanies. I do not looking for incredible low. Just something that allows me to enjoy, for example, a good jazz in a fairly decent way without an urgent need for a subwoofer. To me is enough that I can hear the range of 55-65Hz, but as I said before, without arriving at anything extreme. For something extreme, I have two 15 inch subwoofers in a sealed box.

In a sealed box of 8 liters, the F3 is 80hz, not 85hz. This is a detail, but everything counts
personally, i wouldnt be scared to use them in a sealed box. after many years of messing with both sealed and vented systems, i have come full circle and once again i prefer the small sacrifice in 'maximally flat' bass extension of a vented design to obtain the smoother, and transiently better response that a closed box will produce. room gain and the fact i listen within about 10ft mostly, means that often the result is better than the vented boxes i have. id even go as far to say that a low Qb (sub 0.707) sealed box can be even better, and ultimately flatter, when room gain is factored in. group delay on bass is noticable in many vented systems, and until recently i was sceptical about its audibilty. all these things combined with the fact you will sometimes be using a sub, makes me think that closed is definitly the way to go. ive often found jazzy drums and double bass sound far better, although less 'full' when i used the same driver in 'optimal' boxes both vented and sealed for comparison. and this is using the visaton AL130 which also has a very high EBP(pointing to a vented design) but the qts of 0.4ish means its a little more versatile. group delay in WinISD is cut from about 15ms to less than 6. ive also tried this with a old pair of audax ap130zo, with slightly less impressive results. the Fs of the audax is about 58hz thought, and the EBP way over 100 if i recall correctly.

i hope that maybe this is of some help
__________________
Every new piece of knowledge pushes something else out of my brain - Homer.....................Simpson

Last edited by mondogenerator; 27th December 2010 at 05:53 PM.
  Reply With Quote
Old 27th December 2010, 06:04 PM   #19
sreten is online now sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
Originally Posted by ramiro77 View Post
40Hz tune to me seems crazy, the group delay is very high.
Hi,

Tuning it wrong for the wrong reasons IMO is not a good idea at all.
The tuning is perfectly sensible to me. The group delay is inevitable
and FWIW superior to the higher tuning interpreted correctly, as
are the other parameters except for maximum F3 bass extension.

rgds, sreten.

This driver IMO does not suit sealed well for full range, no subs.
Suggested alignment is quasi-first order rolloff for room matching.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 27th December 2010 at 06:18 PM.
  Reply With Quote
Old 27th December 2010, 07:10 PM   #20
diyAudio Member
 
Join Date: Nov 2010
Agreed with Mondo.
Sealed much better.
  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
Another Peerless 830875 Execution swin1 Multi-Way 16 4th October 2010 05:19 AM
Peerless 830875 vs SEAS CA18RNX cs Multi-Way 0 5th March 2008 12:51 PM
Peerless 830875 Nomex????? Gavinator68 Multi-Way 2 8th November 2005 02:55 AM
Peerless CSX 10 inch in sealed box or TL? ashok Multi-Way 12 23rd January 2004 11:24 PM
good sealed box size for a 10" Peerless XLS sub peerless Multi-Way 1 1st August 2003 10:01 PM


New To Site? Need Help?

All times are GMT. The time now is 11:23 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