Cambridge R50 maintenance and testing - 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 1st March 2015, 09:22 AM   #1
mr-mac is offline mr-mac  Scotland
diyAudio Member
 
Join Date: Jul 2001
Location: Leuchars, Scotland
Default Cambridge R50 maintenance and testing

Hi,

Firstly excuse the wallpaper... not long moved in and well just not decorated yet

Recently got some nice R50's with very heavy metal plinths. Primarily I got them as my wee man is autistic (non verbal and no concept of danger) and needed speakers he couldn't push over. Also the sound I like seemed to be what most people said these do well. Quality deep defined bass even at lower volume levels, nice soundstage and lastly because proper TL's placement is less of an issue (which being they need to be closer in to wall and either side of fireplace was a massively good thing)...

So now i've had them a few weeks i reckon I need to think about making them the best I can as they are 40 yr old. They already have falcon crossovers (will check version when I look inside) and t27's were replaced with a matched pair about 1yr ago.

Can I test the b139 (earlier racetrack but black surround), b110 and coles 4001g with a multimeter in ohm to see if they are still in good ball park for being in spec??? if I can test like this what am I looking for?

Guess next job is fluffing up and putting back the lambswool as it'll be likely a bit tired (any hints tips for this obviously can only do what I can reach).

Lastly I guess only other things for best performance is possibly update internal wiring and when I put it all back together a little bluetack to seal baffle to cabinet and drivers to baffle.

Any other ideas for things to check and/or improvements I can make?

The metal plinth has a hollow inside so will maybe add some more mass inside plinth (though more as an extra weight to help stop wee man toppling as he gets older) plinth slightly widens base and allows spikes which i'll also be doing when the spike shoes are here.

Thanks for any thoughts and advice. New to serious mucking about with speakers and have had a good search online at what others have been up to but know all the members on here are superb and i'll get best advice rather than wondering if I'm going in correct direction
Attached Images
File Type: jpg WP_20150225_17_55_57_Pro.jpg (445.9 KB, 53 views)
File Type: jpg WP_20150225_17_51_26_Pro.jpg (439.5 KB, 51 views)

Last edited by mr-mac; 1st March 2015 at 09:25 AM.
  Reply With Quote
Old 1st March 2015, 10:26 AM   #2
AllenB is offline AllenB  Australia
diyAudio Member
 
Join Date: Oct 2008
Measuring the resistance of the drivers may only show whether they are functional or not as resistance shouldn't change with their state of wear...If you are going to use blue tak why not take the opportunity to experiment with rubber collars around the mounting screws for a soft mount?
  Reply With Quote
Old 1st March 2015, 10:46 AM   #3
mr-mac is offline mr-mac  Scotland
diyAudio Member
 
Join Date: Jul 2001
Location: Leuchars, Scotland
In addition to bluetack? just like an o ring sort if thing to allow bluetack to seal but reduce vibration transmission or are they something else??
  Reply With Quote
Old 1st March 2015, 10:47 AM   #4
mr-mac is offline mr-mac  Scotland
diyAudio Member
 
Join Date: Jul 2001
Location: Leuchars, Scotland
And is it one o-ring behind and one in front? actually is it bluetavk behind then rubber collar under bilt head on outside??? Sounds more plausible?

Last edited by mr-mac; 1st March 2015 at 10:54 AM.
  Reply With Quote
Old 1st March 2015, 09:27 PM   #5
AllenB is offline AllenB  Australia
diyAudio Member
 
Join Date: Oct 2008
Quote:
Originally Posted by mr-mac View Post
is it bluetavk behind then rubber collar under bilt head on outside??? Sounds more plausible?
That's it. Since sound can be transferred through the speaker edges that might buzz the cabinet. You'll have to find the best tension on the bolts if you find it makes a positive difference.
  Reply With Quote
Old 9th August 2015, 05:07 PM   #6
48kg is offline 48kg  United Kingdom
diyAudio Member
 
48kg's Avatar
 
Join Date: Jan 2010
Location: Kent England
I don`t often get on here but i did notice in your pics. that the fronts are on upside down......the cross pieces should not go across the speakers.

That plastic badge will come off as it is held with sticky tape on the phase 2`s the phase 1`s as mine are don`t have the badges.
  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
cambridge r50 crossovers tonysherwin Multi-Way 1 15th October 2014 07:21 AM
Cambridge R50 Tim Smallwood Introductions 3 30th March 2012 03:09 PM
cambridge r50 tonysherwin Multi-Way 5 7th July 2008 10:13 AM
R50 Cambridge Audio :) PhaseLockLoopy Multi-Way 2 27th May 2008 10:37 PM
About to refurbish my Cambridge R50's quick-sand Multi-Way 4 22nd February 2005 05:47 AM


New To Site? Need Help?

All times are GMT. The time now is 12:24 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