|SEAS W17EX001 + ScanSpeak
Copyright 2005 © Troels Gravesen
This speaker is derived from a well-known commercial design and I modified the crossover for Johnny, who had build the speakers and I was positively surprised by the good sound from these drivers - even the 8513! The W17 drivers are probably very hard to find these days, so this file will soon be listed in the vintage section.
Use the TJL cabinet. Vent = 72 ID
x 200 mm or 67 (ID) x 170 mm and tilt 5 deg.
Left: SPL response. Very flat indeed, be
prepared for a somewhat bright sound. I suggest also
trying 5R6 and 6R8 to the tweeter. Red/blue = plus/minus
impedance smoothing circuit. Read below.
After having had Johnny's speakes for some days it appeared that there were more to these drivers than a crossover quite closely resembling the original layout. Having a very flat response the sounds is somewhat bright and piano wasn't quite right, sometimes resembling the sound of a harpsichord and also some excessive emphasis on shh.... sounds from vocals. I thought I'd try a radical new design and see/hear what could be done. One thing was trying targeting the BBC dip usually giving a more natural balance to most instruments and vocals and another thing hearing what a series crossover would do. Hence the W17EX/8513 crossover below.
Left: SPL response, here without the
midrange notch filter.
Left: Red = series filter. Blue = series
filter with midrange notchfilter. Maybe you think this
looks quite dramatic, so let's take a look at the
Thanks to Johnny for lending me his speakers.