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Here is the DATS of the Radian 760NEO PB mounted on a JMLC horn (340 Hz flare)

Note: the rear chamber has 3mm thick felt damping added.

Now notice the difference in DATS of the Radian 760NEO PB when a 0.007" spacer is added.

These spacers are sold by Radian for heavy duty use and prevent the diaphragm ever touching the phase plug when pushing very high SPL.

It’s still mounted on the same JMLC horn (340hz flare) with rear cover in place and with the felt damping added.

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The FS increased by about 10% and QTS rises ~20%

It’s definitely not making things better. The cost of playing louder seems to be detrimental to the specifications and overall performance.

Now notice the difference in DATS of the Radian 760NEO PB without the spacer.

And with an open back (back cover removed).

It’s still mounted on the same JMLC horn (340 Hz flare)

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The FS decreased by about 8% 

QTS decreased by about 15% (QMS also improved)

This is very interesting.

The higher impedance peaks are con-consequential due to the active crossover set-up.

In a passive crossover set-up, crossover adjustment would be required to conserve the same output. As is typical, passive crossovers are always a pain.

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Subjectively, this is my favorite setup… by far.

The maximum power is obviously reducedwithout the rear cover in place.

 However, in home environment, running on less than 3 Watts, it changes nothing.

The original spec is 75 Watts above 800 Hz as per Radian, I'm using less than 1watt...

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The biggest drawback is the fragile diaphragm being exposed. It’s just begging for a kid to push it, and likely damaging it.

 

 

If your compression driver can run without back chamber, give it a try. It may surprise you.

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Here again is the 760NEO PB mounted on Selenium HL14-50N exponential horn.

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As expected, the results are very different than on the 340Hz JMLC

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Horn type, flare and size matter a lot.

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