are no really lazy people, just uninspired ones - Berry Gordy
40 years after the Apollo landing on the moon, and 5 years after
building my original Delta speaker (and starting this website),
the time has come for the next step forward in the pursuit of the
ultimate loudspeaker system.
My 2009-2010 Apollo project incorporates the following features
1 - "flat
panel" (shallow & wide) design, inspired by the wide Boston
Acoustics designs of the 1980s, and Sonus Faber's Stradivari Homage.
Wide, flat baffles reduce the listening room acoustic signature.
i.e. they tend to bring the listener into the musicians room, rather
than the musicians into your room. They also require less baffle-step
compensation to negate the loss of bass that occurs as longer wavelengths
wrap around a typical narrow enclosure.
2 - new high
performance tweeter with particulary powerful low frequency performance
i.e. low compression and harmonic distortion.
3 - a new 4"
neodymium underhung specialist midrange.
4 - a new 6
1/2" neodymium underhung bass-midrange driver to cover the
fundamental range of the human voice, whilst increasing power handling
5 - a new wideband
12" (sub)woofer, actively driven, extending the bottom end
to 25Hz (-3dB).
6 - time-aligned
(stepped) baffle with separated enclosures (for isolation &
7 - highly-rigid
bass enclosure for minimal cabinet resonance
8 - attention
to driver rear ventilation, i.e. inside the enclosure
9 - improvements
to general cabinet construction techniques and accuracy
10 - invisible
grill mounting using high-strength neodymium magnets
11 - variovented
lower and upper midrange enclosures
12 - first order,
linear phase design (as close to as practical)