Measured by Dr Boar: Beyma CP21/F - 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 12th August 2015, 09:02 PM   #1
DrBoar is offline DrBoar  Sweden
diyAudio Member
 
DrBoar's Avatar
 
Join Date: Apr 2003
Location: Stockholm
Default Measured by Dr Boar: Beyma CP21/F

I have a pair of old second hand CP21/F Beymas graphs looks like this (linked in Europe Audio)

Click the image to open in full size.

The new shiny one and the corresponding graph from Beymas home page.

Click the image to open in full size.

My own measurements:
Using XTZ room analyzer II. Driver on carpet facing up with mic 10 cm in front of driver.
Click the image to open in full size.

Using Omnimic with 1 m measurements distance and the driver at the end of a long spirit level so there is no baffle loading. The setup:

Click the image to open in full size.

The results using both a 5 dB and 2 dB resolution.

Click the image to open in full size.

Click the image to open in full size.

I think my measurements using both different systems and setups are consistent with the Beyma graphs.
The shelf 2-4 kHz is there, as is the peak around 8 kHz and the squiggle at about 13 kHz and finally the drop just below 20 kHz.

I intend to do distortion (105 & 95 dB perhaps) and time domain measurements. But I need to get better earplugs to protect my hearing and also do the measurements when my wife is out of the house.

Regarding my measurements there is consistent dip below 4 kHz compared to Beymas measurements. Do the horn actually benefit from a baffle? Not that I intend to cross it lower than 4 kHz.
  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
Acoustic Gain From Using Adjacent Dr dr chienmort Full Range 3 24th September 2014 02:49 PM
Tqwt with Beyma BEYMA 12XA30/Nd simulation sladdbarn Multi-Way 11 18th May 2013 03:58 PM
Beyma CP21/F Sjef Multi-Way 7 29th December 2004 07:54 AM
Calling Dr. Fletcher! Dr. Munson! Apparent 20 dB Discrepancy! kelticwizard Multi-Way 10 18th November 2004 01:59 PM
Self measured T/S bhg41088 Multi-Way 10 14th May 2004 12:09 AM


New To Site? Need Help?

All times are GMT. The time now is 05:01 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2