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Multi-Way Conventional loudspeakers with crossovers

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Old 27th March 2009, 12:33 PM   #11
marcels is offline marcels  Netherlands
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Quote:
Originally posted by delsix
thanks for the reply.

It's attached, see picture.
Hi,

I am pretty sure these are the Peerless M122
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Old 27th March 2009, 02:27 PM   #12
sreten is offline sreten  United Kingdom
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Hi,

They are British made Nightingale loudspeakers I recall.

KEF B139, Peerless KO40MRF sealed midrange (there was a
UK coated version of this, done by Falcon Acoustics), and
what looks like an Isophon KK8 tweeter, the crossover is
by Falcon Acoustics, they made a lot of British crossovers.

If you restore them as is, the elcaps might be worth replacing,
though the ones used are far better quality than the typical
far eastern variety available at the time.

As I recall they had a deep reticulated foam front grille and
and five sided reticulated foam hood, fitting over the whole
top section, both of these simply disintegrate over time.

/sreten.
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Old 27th March 2009, 06:09 PM   #13
delsix is offline delsix  United Kingdom
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I think you may well be right, the crossovers are Falcon Acoustics model PCB3A.

I've had one of the kef b139 units out and found that the main cabinet is a transmission line . So I'm now thinking that a pair of transmission line subs would be a good start.

A couple of questions,
is it possible to mend the peerless midrange drivers? Apart from the surrounds, which have completely withered, they appear in pretty good condition.
Also, can someone recommend suitable (I mean cheap here) replacement tweeters
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Old 27th March 2009, 06:16 PM   #14
delsix is offline delsix  United Kingdom
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close up of tweeter
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File Type: jpg p270309_16.03.jpg (26.3 KB, 300 views)
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Old 27th March 2009, 06:26 PM   #15
delsix is offline delsix  United Kingdom
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and the back
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Old 27th March 2009, 06:33 PM   #16
sreten is offline sreten  United Kingdom
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Hi,

You can certainly refoam the mid ranges with a kit from e-pray.
Might not be perfect but should make them usable / serviceable.

If your tweeters are fried Maplin sell a 5 a pop dome tweeter.
Not perfect by any means but will make them usable / serviceable.

Click the image to open in full size.

You may have to adjust the treble resistors in the crossover.

/sreten.
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Old 27th March 2009, 07:39 PM   #17
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Tou could try to restore them. You might be better to look at them as a pair of nice woofers ready for you to add a modern 1-way or 2-way minimonitor on top. (suggest active XO between bass & sats)

dave
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Old 27th March 2009, 08:55 PM   #18
delsix is offline delsix  United Kingdom
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Now funny you should say that as I have a pair of fostex fe87 3" drivers currently sat in a couple of old planks desperately in need of bass. I've also got a set of active filter boards from the GB which have just gathered dust.
I have zero experience with crossovers. However, I'll have a stab at 175Hz crossover point and 3rd (I'm really guessing now) order filter.
Open baffle or box, no idea really tho neither would be difficult

Hopefully that would make a nice set of speakers for the basement, give me a pair of active subs if I needed them and leave open a future project to build a really nice pair of mini monitors, oh and be really cheap to boot.

Am I in the right ballpark?
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Old 27th March 2009, 08:57 PM   #19
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If you want quick results, I'd agree with Dave when he said about a couple of small monitor speakers, and keep the Kef bass driver.

However, I would be curious about how the other drivers sound, so, if I were you, I'd try to restore them, see what they sound like.

If you don't like the sound, get some small monitors, if you do like the sound, keep them and enjoy.
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Old 28th March 2009, 12:39 AM   #20
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Quote:
Originally posted by delsix
Now funny you should say that as I have a pair of fostex fe87 3" drivers currently sat in a couple of old planks desperately in need of bass. I've also got a set of active filter boards from the GB which have just gathered dust.
I have zero experience with crossovers. However, I'll have a stab at 175Hz crossover point and 3rd (I'm really guessing now) order filter.
Open baffle or box, no idea really tho neither would be difficult

Hopefully that would make a nice set of speakers for the basement, give me a pair of active subs if I needed them and leave open a future project to build a really nice pair of mini monitors, oh and be really cheap to boot.

Am I in the right ballpark?
Don't dismiss the FE87 as potential minimonitors. Tricked up i understand they can be very surprising (the FF85 sure is). With the B139 you want to keep the XO below 250 Hz, they have a particularily nasty circa 1 k resonance. The "box" for the FE87 could be as simple as an open baffle the width of the box (and then the XO point is chosen to relate to that -- ie around the bafflestep point). 3rd order would be fine. On our FF85 to bass driver i'm using 2nd order HP, 1st order kowpass, butit is a special case.

dave
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