(Dec 16, 2012)
PDS382 1" Titanium Compression Driver
(Bi-Amp) at 2,250Hz (18dB/oct)
The H07E Elliptical
Waveguide by Dayton is truly unexpected.
When coupled with a Pyle PDS382 1" Titanium
Compression Driver, this waveguide exhibits minimal
roll-off and amazingly, an exceptionally smooth
response from 3kHz to 10kHz (Fig 1). The PDS382
starts to breakup at 10kHz but I'm not really concerned
as there's very little musical information up there.
Fig 2, the green plot is of the H07E through the
Synergy with the active crossover set at 2,250kHz.
As can be seen, the hump at 2kHz is slightly attenuated
due to the slope of the 18dB crossover. By all accounts,
this is certainly an acceptable response. However,
in listening to music, I found the sibilance to
be a tad excessive and the highs rather subdued.
a few days listening to various CDs and tuning by
ear, the yellow plot (Fig 3) is the final response.
An EQ network of 4uF in parallel with 4.7 ohms resistor
lifts the higher frequencies upwards, adding "sparkle"
to the treble. In addition, a 8uF is in series to
tame the sibilance further.
• Hybrid (Active
Crossover + Passive Contouring) Dec 16, 2012
Passive Network (March 28, 2013)