strange measurements from Peerless 830883 mid - 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 27th May 2013, 11:43 PM   #1
diyAudio Member
 
Join Date: Nov 2004
Location: ny
Default strange measurements from Peerless 830883 mid

Hey all,

Dumptruck and I have been wrestling with doing a OB design and I can't for the life of me understand why I am getting this weird saddle shaped response on my OB mid. There is a 10db dip at 1k. But the response is down by a wide freq range in the middle see graph. The baffle is 11 1/2 w and wings are 4 inches deep on the side. Do you think this is due to the OB? If you look at the spec sheet the response is nothing like that, unless it is my room.


saddle response.jpg
  Reply With Quote
Old 28th May 2013, 12:04 AM   #2
diyAudio Member
 
Join Date: Mar 2011
Location: Rochester, MN
What are the measurement conditions? I'm assuming that's some sort of in room response, not gated?
  Reply With Quote
Old 28th May 2013, 12:51 AM   #3
diyAudio Member
 
Join Date: Nov 2004
Location: ny
Default measurement

In room. I am 2 ft from baffle and i vary the gating without much change other than a few ripples. I use Omnimic.
  Reply With Quote
Old 28th May 2013, 01:23 AM   #4
diyAudio Member
 
Join Date: Jan 2008
Behavior >1kHz looks close to published data; 300Hz is dipole peak, and below is roughly dipole behavior. Peak at about 30Hz could be room, but looks to me more like poor signal/noise ratio.
  Reply With Quote
Old 28th May 2013, 01:34 AM   #5
diyAudio Member
 
Join Date: Aug 2008
Hi Jim,

I'm not sure about everything, but I do agree that it is "similar" to published data. Maybe not as extreme. I remember seeing the measured response of my drivers on the baffle, and they had the same smile

Click the image to open in full size.

After the crossover, this is the simulated response. We have not measured them since the completion, but I'd bet they are very close to the simulated response.
  Reply With Quote
Old 28th May 2013, 02:02 AM   #6
diyAudio Member
 
Join Date: Nov 2004
Location: ny
One of the things we are struggling with is that when using PCD to design it appears that the mid is significantly lower sensitivity than the Dayton RS270. But the specs look to be within 1 db of each other. When I listen to them they don't sound like they are measuring. SO we are going crazy with the mid response.
  Reply With Quote
Old 28th May 2013, 02:07 AM   #7
diyAudio Member
 
Join Date: Aug 2008
Are you saying the miss are more pronounced or laid back? Is the RS-270
open also?

I would think the rs-270 would be lower efficiency open.

Where are you crossing? I'm crossed at 300Hz to mine. 3rd order if I recall.
  Reply With Quote
Old 28th May 2013, 10:50 AM   #8
Juhazi is offline Juhazi  Finland
diyAudio Member
 
Juhazi's Avatar
 
Join Date: Mar 2007
Location: Jyväskylä
I don't know of sensitivities, but the response of the Peerless HDS is "real" to me. The lower peak is dipole peak and higher peak is driver's rising response at 0¤ http://www.audio-components.co.uk/pd...cts/830883.pdf

I don't understand much of mathematics and passive xo design, but I do know that a minidsp is a wonderful thing! The problem is that you'll need a bundle fo amplifier channels!
Attached Images
File Type: png Peerless 830883.png (24.4 KB, 134 views)
__________________
AES Associate Member / My DIY speaker history: -74 Philips 3-way, -82 Hifi 85B, -07 Zaph L18, XLS10+PR/Hypex, -08 CSS125FR, -08 Hifitalo AW-7, -08 TangBand FR, -09 MarkK ER18DXT, -13 PPSL470, -13 AINOgradient
  Reply With Quote
Old 28th May 2013, 12:06 PM   #9
diyAudio Member
 
Join Date: Nov 2004
Location: ny
Default Matches

Quote:
Originally Posted by Juhazi View Post
I don't know of sensitivities, but the response of the Peerless HDS is "real" to me. The lower peak is dipole peak and higher peak is driver's rising response at 0¤ http://www.audio-components.co.uk/pd...cts/830883.pdf

I don't understand much of mathematics and passive xo design, but I do know that a minidsp is a wonderful thing! The problem is that you'll need a bundle fo amplifier channels!
Ok i see the upper end response matches fairly well. I also assumed the lower peak was a dipole peak. I xo at 300 and 2500 so maybe I adjust the points just enough to mask it
  Reply With Quote
Old 28th May 2013, 12:09 PM   #10
diyAudio Member
 
Join Date: Nov 2004
Location: ny
Quote:
Originally Posted by deicide67 View Post
Are you saying the miss are more pronounced or laid back? Is the RS-270
open also?

I would think the rs-270 would be lower efficiency open.

Where are you crossing? I'm crossed at 300Hz to mine. 3rd order if I recall.
The RS270 is in a sealed box. Sorry i wasn't clear on that. The mid sounds (to my ears) about the same efficiency as the RS270, but when I plot the Fr it appears lower (other than the peaks.) I think I am going to have to design th XO and remeasure and see if the mid still looks low.
  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
Seas U18RNX/P Vs Peerless 830883 jimbones Multi-Way 4 15th December 2012 12:53 PM
tweeter advice for peerless 830883 flexus Multi-Way 47 30th December 2009 09:24 PM
peerless 830883 in stock at solen blue934 Multi-Way 0 20th September 2009 05:55 AM
peerless 830883 Question mbutzkies Multi-Way 0 9th January 2007 03:11 AM
Measurements for the Peerless HDS182 6.5" mid? downward_dog Multi-Way 5 26th February 2005 12:28 AM


New To Site? Need Help?

All times are GMT. The time now is 01:58 AM.


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