New Joseph Audio Pulsar Graphene 2

@erik_squires ... Well, we certainly disagree on the purported simplicity of the xover and Jeff’s integrity. Here’s a link to the initial patent application for the xover by Modafferi ...https://patents.justia.com/patent/7085389

It doesn’t appear to me to be a simple second order xover, and I believe that Jeff has improved it over time. JA’s measurements in SP are not always the final explanation.

Judging from the :

• Driver slopes
• Impedance curves
• Off-axis response (the real killer)

The speaker JA measured did not perform differently in any meaningful way from a traditional 2nd order speaker, except for a dip in the middle of the crossover impeadance peak which is very likely an impedance compensation circuit. A nice add.

That doesn’t make it a bad speaker, at all. In fact I would say the performance is top notch for a 2-way speaker, but I see no evidence of it being more than a well designed 2-way with good drivers and traditional crossover design.

It doesn’t appear to me to be a simple second order xover,

Please explain from the data in the review.

I believe that Jeff has improved it over time.

Except that the review claims the measured speaker has their infinite slope crossover.

I read another Stereophile review of a JA speaker and it did seem to use a very high crossover slope, but only in the woofer of a 3-way. The rest seemed rather traditional.

Best,
E

One of the benefits in the Magico design is the use of  underhung voice coils to lower the distortion..expensive..but worth the cost!

Magico design is the use of underhung voice coils to lower the distortion..expensive..but worth the cost!

whats that?

the best way to do infinity slopes is active. its hard enough doing 4th order using passive. The use of passive crossovers has no advantages. That alone diminishes the quality. 

You need to eliminate that passive crossover first before you judge the quality of these joseph audios. 

Then you can actually judge how much cabinet coloration there is and how much detail the drivers produce without worrying about what the crossover is doing.