Used Full Range drivers, second life..

[planet10]

OK, lets start with this one because it is handy....

In Canada older Norescos are a good source for donors. These are from amoungst the latest worthwhile mining, probably model NEC-524 (i haven't run across all too many of these, can recognize the box when i see it, but it isn't ingrained in my brain enuff to describe it). Earlier models used Isophons or Philips drivers, these ones are a result of cost trimming. Ruinious duties made it sensible to assemble locally with some foriegn content. These are interesting in that they are the deep isophon 8" cone with a whizzer added. Made by Marsland. These are quite excellent soundng, support the FE166/167 phase plugs, and have Q suitable for OB, pipe/TL, or aperiodic box.

[planet10]

Average Measured Parameters (of 1 recent pair, quite closely matched). Sorry no Vas yet

Fs 69 Hz
Qts 0.66
Qms 3.95
Qes 0.80

[Sylver300B]

Hi Planet,

The technical data you just introduced, is it for the 8" Marsland drivers you just refered to in your previous post?

Quite interesting. It reminds me that some 30 years ago, I bought a pair of 8" Marsland, with whizzer cones, to make a pair of speakers for my mom's kitchen. She still uses them, though I always found they had some "cup" sound resonances.

I already look forward to starting my search in the flea markets this summer.

[planet10]

Originally posted by Sylver300B
The technical data you just introduced, is it for the 8" Marsland drivers you just refered to in your previous post?

Yes... as i go thru these i will post in the above format... pic and then (if i have it) the technical date with an impedance curve.

dave

[planet10]

Older Norescos -- notable by a brownish tweed-like grill, and backs held in place with robertson screws -- have Isophon & Philips drivers. The 2 smallest have Philips 7" & 5" drivers with whizzer cones.

I have already put together a page with a whack of Philips drivers in it.

http://homepage.mac.com/planet10/vin...llery/philips/

I've not found a lot of the 5" drivers (or they have been more than i've been willing to spend -- they don't command what they are worth on eBay) -- the 7s have an accordian surround.

One of the early speakers i ever built (in 1974) used 4 of the 5" (new at the time) in an EPI MicroTower clone -- my brother is still using these, althou they have been supplanted as his prime speakers with another set of alpha TLs i built for him with 6 1/2" drivers.

dave

[planet10]

On to the rest of those vintage Noresco donors ... there really are only 3 others that i have run into... lets start with the smallest. Come with a P1123* 4" x 9" FR + a 4" tweeter

[planet10]

Next size up have P18s 7" FR + 4" tweeter

[planet10]

I have manually collected T/S + an impedance curve of a different pair (before FuzzMeasure did T/S)

Fs 93 Hz
Qt 1.85
Qe 2.39
Qm 8.44
Vas 12.5 litres
SPL 88.5 dB 1w/1m

[planet10]

Both of the above come with a 4" tweeter -- the HM10. disreguarding impedance, i've seen 4 versions of these, the combinations of aperiodic or not & tall or shallow. The Norescos come with tall, non-aperiodic.

[planet10]

impedance plot -- as you can see, smooth enuff for a text book XO to work just fine