Dynaudio 15W75-04 + Esotar
Dynaudio Esotar T330D (double magnet) and 15W75-04
Make sure the tweeter is the double magnet
type seen here. Other variant won't work with the given crossover.
12 dB LR crossover.
Cabinets made from 19 mm MDF.
SPL response taken at 1-meter distance, tweeter height.
Fine-tuning of notch filters: Green = without notch
Red = 10-12 kHz notch filter inserted.
Blue = both notch filters inserted.
SPL response from combined and individual drivers.
Blue = minimum phase.
The inspiration for this design came from
John Kreskovsky at http://www.geocities.com/kreskovs/John1.html. Unfortunately
this two-way design (Morel tweeter) is no longer
available from his website.
The 15W75-04 (or -"08" for 8 ohms version) is a
particular troublesome driver as it has two
intrinsic resonances that have to be taken care of in the
crossover design. I have been testing the drivers in a
two-way design with the Esotar tweeter and got a very
nice response profile and a quite complex parallel
crossover. Two notch filters were necessary to eliminate
two resonances at 2.3 kHz and 10-12 kHz. I had to
fine-tune the crossover for my 4 ohms version where
Johns were based on 8 ohms drivers.