Cambridge Audio R50 and Rogers Monitor repair - diyAudio
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Old 27th November 2012, 08:22 AM   #1
fborden is offline fborden  Netherlands
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Default Cambridge Audio R50 and Rogers Monitor repair

Hello,

I have two sets of TL speakers which both need work. I would like to get your opinions what is the best approach.

Cambridge Audio R50
Click the image to open in full size.
As you can see these speakers are in bad shape. Also one unit has replacement for the T27 and Coles from Monarch (DT105 and DM135).
The filter needs to be recapped after 40 years

Rogers Monitor (RM)
Click the image to open in full size.
These are visual in good shape and sound OK but need to be recapped as well and possibly need a new filter.
The units are Kef B139 and B110 and Audax HD100D25

Here are the options I consider:
1) R50 replace the Monarch with Coles (replacement) and T27 (from ebay). Recap the filter. Cleanup the enclosure and use the R50 and sell the RMs.
2) R50 replace the T27 and the Monarch TM135 with the Audax HD100D25. Recap the filter and sell the remaining Kef units on eBay
3) RM replace the filter with the filter from the R50 and recap and throw out the R50.

What are your opinions on the R50 vs RM? And what approach would you take. Or what alternatives can you think of?

Thanks,

Frank

Last edited by fborden; 27th November 2012 at 08:51 AM.
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Old 27th November 2012, 09:27 AM   #2
frugal-phile(tm)
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Frank,

The 2 lines are very similar... the Cambridge is the Webb TL, and (i'm guessing) the Rogers Monitor is the Pro9TL. Without going as far as building new cabinets*, i'd pull the B110, T27, and ST out of the Pro9TL, flip it upside down, install a Fostex FF85wk or Mark Audio Alpair 6.2M, and biamp.

*(4 B139s are screamng, push-push TL at me)

Can you post an R50 pic without the grills? And a close up of all but the B139s.

dave
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Old 27th November 2012, 09:48 AM   #3
fborden is offline fborden  Netherlands
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Hi Dave,

Here are some pics from the R50s
Click the image to open in full size.
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Old 27th November 2012, 12:38 PM   #4
fborden is offline fborden  Netherlands
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Steve,

I read in numerous replies that you are in favor of flipping the TL upside down. Can you send me the rational behind this?

Frank

Last edited by fborden; 27th November 2012 at 12:45 PM.
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Old 27th November 2012, 04:00 PM   #5
DrBoar is offline DrBoar  Sweden
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There are two main roads to take. The Vintage way trying to recreate the original design as close as possible, be it 4 or even 5 way. The modernising way is to simplify the design by replacing the T27 with a modern dome that cope well all the way up.
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Old 27th November 2012, 06:49 PM   #6
fborden is offline fborden  Netherlands
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Do you have specific units in mind? Also what should the xover be like?
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Old 28th November 2012, 12:51 PM   #7
fborden is offline fborden  Netherlands
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Steve, sorry I called you Dave before ;-)

Can you send me an idea on XOver in combination with B139?

Frank
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Old 15th January 2013, 07:10 PM   #8
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Default Cambridge R50

I've got two I made 20 years ago with Falcon crossovers and 4001G supertweeters. Unfortunately I'd lost the page from the original Webb article with the front panel spacings so I did it by guesswork from a photo.

Does any kind person have the page or could measure one they've got. Webb says the spacing between the treble units is critical so the distance between centres would be particularly helpful. In fact all I really need is spacings between the four driver centres.

I've got most of Webb's article marked 1/75 so if I can help anyone.

I used long fibre wool which caused moth hell in my home. I''ve replaced it with wadding from IKEA pillows - very cheap.

I left out various bits of strutting and did not underseal or veneer so I'm doing that plus if I can get the measurements I'll make an accurate front panel. I fancy zebrawood veneer but what a price.

They sound pretty good to me!
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Old 15th January 2013, 07:27 PM   #9
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I have the speaker builder version of the Webb article, but it is paper so the search could be long.

Jerry at Falcon has said he is planning to post the original article in his archives... a poke might push that forward.

dave
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Old 15th January 2013, 07:42 PM   #10
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Quote:
Originally Posted by planet10 View Post
I have the speaker builder version of the Webb article, but it is paper so the search could be long.

Jerry at Falcon has said he is planning to post the original article in his archives... a poke might push that forward.

dave
Thank you!

I've mailed Falcon.
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