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FS: Scanspeak 21W/8555-00 8" Carbon Fibre / Paper composite Woofer Pair

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Posted (edited)

Item: Scanspeak 21W/8555-00 8" Carbon Fibre / Paper composite Woofer Pair


Location: Brisbane


Price: $260 plus postage. RRP $240 each plus postage


Item Condition: Excellent. Never soldered. Cones and surrounds are perfect. Still in original Scanspeak boxes so happy to post.


Reason for selling: NLR.


Payment Method: Pickup - Cash or Paypal. Postage - Paypal (as a friend or add 3%)


Extra Info: A great woofer that is capable of deep bass in sealed or ported enclosures. It has a useful sensitivity  of 88dB /w/m - not a highly sensitive woofer but the payoff is deep bass in moderately sized boxes.

I would describe the bass as quite dry (subjective opinion), detailed and it has good pitch definition. The dryness may be result of the distortion signature of the woofer - whereas some paper woofers offer higher levels of 2nd order distortion which can sound "fat" or "warmer".

It has a well designed motor system that allows for very large excursions. Xmech is 12mm+/- and has Scanspeak's SD-1 magnet system that allows for very long excursion where normal woofers might see the voice coil hitting the back-plate.

It has a usefully flat frequency response up to cone breakup. I have heard of people using these in 2 way designs but you'd want to use an active crossover or a steep passive crossover slope and cross it over to a good tweeter quite low.

It has a very cool look with carbon-fibre "veins" running through the unpressed paper cone. It also has an inverted dust cap which will make it suitable for use where there are small children who love to push dust caps in!

 

Troels did 3 designs with this woofer. http://www.troelsgravesen.dk/ScanSpeak-3WC-C.htm

"The 21W/8555-00 is an all-time classic and with its carbon filler paper pulp cone a potent bass driver, no need to do mkII versions for something that just works. It displays a very nice Qm of 4.5 and a Qt of 0.31, well suited for bass reflex application.  A well engineered driver! The current 21W/8555-10 only has an aluminum chassis rather than magnesium - TS data stays the same and from some 40 litres we get an F3 of 35 Hz, quite impressive. This bass driver goes deep from a small volume. Price to pay is little less sensitivity, but it runs very well from my tubed GlowMaster power amp."

 

As an example you would expect a -6dB point of 25hz in a 50litre ported box tuned to 29hz. Another example would be a 40litre sealed box which would get you a -6dB of 30hz which is very respectable.
 

http://www.scan-speak.dk/datasheet/archive/21w-8555-00.pdf

 


Pictures: The white spots in the pictures are dust, not scratches!

 

I got into the office early this morning and did the DATS tests and took photos of the drivers for you. As I would expect from Scanspeak, they measure very close:

 

Driver "A"

driver_A.thumb.png.ab23098054cb885745f8db52c4b35ae8.png

 

Driver B:

driver_B.thumb.png.d0e930094e58bc2c6748f1ebe74e3d2c.png

 

IMG_20190320_081719.thumb.jpg.001f02598b86caf6d95e3a7944b1c43f.jpgIMG_20190320_081641.thumb.jpg.e655177873622830654a667045d30146.jpgIMG_20190320_081631.thumb.jpg.2648d449e8dcb833dc2d9099242100d9.jpgIMG_20190320_081625.thumb.jpg.8b5156bf33cc97b90805f454508dc5a2.jpgIMG_20190320_081807.thumb.jpg.706b9b326a474b1be508bfe45c0ddaf1.jpgIMG_20190320_081803.thumb.jpg.23122becce4f5f1a6f3832e158467f40.jpgIMG_20190320_081733.thumb.jpg.d722d77a31b5e769faa9fe0daeac5c20.jpgIMG_20190320_081728.thumb.jpg.1c9a8e380d7ff7fa05d769b0721a4297.jpg

 

SCAN-SPEAK 8

Edited by scumbag

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