Impedance Matching Question

[DasguteOhr]

I have read on ther website pap audio xover for coax
Our 15" woofers are connected in parallel and are cut with a second order Low Pass Filter that seamlessly blends into the midrange, whereas the 10" mid driver is crossed with the tweeter by a fourth-order crossover at around 2khz."

Perfect match for the yamaha active solution
The coax driver is not filtered downwards
Brand new ebay usa

Yamaha P3500S Power Amplifier Black - BRAND NEW (Open Box) | eBay

Open Box Includes All Original Accessories and Manual. Color: Black.

www.ebay.com

Or used

Yamaha P3500S P-Series Stereo Power Amplifier Gray Two Channel Rack-Mountable | eBay

Amplify your sound with the Yamaha P3500S Power Amplifier. This 2-channel rack-mountable amplifier features bridgeable and balanced inputs, as well as built-in DSP for optimal sound quality.

www.ebay.com

 

[Kingrex]

The newer one from yamaha have switching power supply, they have a different signature in the sound, I don't like it anymore. try to find the p3500s second-hand on ebay or other portals. the woofer can play so high, the crossover only has a 6db slope, then you can hear signals up to that range. please take a photo of the crossover. the coax plays in the baffle down to 100hz with no problem.
Exsample 1 6db/ 2/12db etc..

The designer said the best is to cross between 250 and 450. The Coax is too small and thin sounding without support of the woofers up into the mid bass. Post #41 only talkes about the cross point of the mid/tweeter. Ze'ev doesn't talk much about the woofer/coax. You have to ask him personally. I have issues with the Yamaha only crossing at 150. What's the slope of the P3500s? Its fixed? I want to be able to adjust it to blend properly. This is also a tool so it needs some versatility.

Passive stock crossover is a Circuit Board. I can't get a picture of the back. Its mounted and running.

 

[DasguteOhr]

The yamaha have second order filter 12db variable from 25-150hz.
Coax beyma have a fs 48hz and a qts 0.38 in a open baffle this means that you lose about 10db of sound pressure at fs 48hz. the best qts for openbaffle is 0.8- 1.0 then you don't lose any sound pressure at the lower limit frequency( fs)
Beyma coax


Trust me that works