Speakers for leading edge, transients, speed and big sound

@saummisra Wrote:

Speakers for leading edge, transients, speed and big sound

Klipsch Jubilee see here and here. 

Mike

@saummisra:

See here a nice used pair of JBL K-2 S9900 speakers for sale. 

Mike

@devinplombier Wrote:

 especially fast, bass?

Fast Bass, Slow Bass - Myth vs. Fact See Here. Choosing a woofer see here. 

Mike

@devinplombier:

Example of a short excursion woofer that @larryi is referencing see here.

The JBL 2220 is a 15'' woofer with a short excursion and has a frequency range of 40 Hz-2 KHz while the JBL 2235 is a 15'' woofer with a long excursion and has a frequency range of 20 Hz-2 KHz. The 2235 woofer will reach two octaves lower in the bass than the 2220 woofer see here. 

Almost all HiFi woofers suffer from this problem (woofer dynamic offset) see below:

''Woofer dynamic offset is a problem long known about but seldom discussed or treated. With high input power at low frequencies, many woofers tend to shift their mean displacement forward or backward until the coil is nearly out of the gap. This is most likely to happen just above each low frequency impedance peak of a system. The result is a high level of second harmonic distortion and subjectively a bass character that loses its tightness at high acoustical output levels [4]. The cure for offset, as shown by T, H. Wiik [6], is a restoring spring force that increases in stiffness at high displacement in an amount that counterbalances the reduced B field at the extremes of voice coil travel. Such a nonlinear spider will in fact reduce distortion and eliminate the tendency to offset.'' See full article here.

Mike

@faustuss Wrote:

faustuss

127 posts

05-06-2025 at 02:58am 

@ditusa Bill Woodman who founded ATC in 1974 solved this problem by using "underslung" edge wound voice coils in a longer and tighter gap which eliminated the "offset" issue while reducing distortion up to 20dB throughout the driver's frequency range. In addition, this reduces the usual swings in impedance as well as radical changes in phase angels resulting in flat impedance response without resonances. The caveat being the need for enormous magnet structures along with considerable reduction in efficiency. Essentially though, you could use any type of amplifier typology to drive their speakers without harm to the amplifier but to get the speaker system to come alive you need minimally a hundred watts high current solid-state power.

Thanks for the post. Remember Bill Woodman and Edmond May see here. 

Mike