Loudspeaker Designs and Articles for the DIY Enthusiast
|A Design utilizing both
Design Goals/Driver selection:
The Maverick design started out simply enough. I wanted to try my hand at a near
full range 8” 2 way that would cost less than $350.00 for drivers and crossover
components. This ended up not happening for a couple of reasons, both due to
the driver costs, and the top end performance of the 4” full range driver chosen.
This required a tweeter to be added to the design, and costs ended up at around
$425.00. -But more of that later. I also wanted to explore the audible differences,
if any, between a transient perfect design and a more conventional 2nd order design. As it turned out, the differences were quite audible, but whether the
TP design proves superior to a conventional design turns out to be a matter of some subjectivity.
This design started to coalesce in my mind when Tang Band came out with the W4-1757S, an aluminum driver with a flat honeycomb ‘cone’. This driver is of
sandwich construction with a very thin layer of aluminum either side of a honeycomb substrate. The ‘cone’ is glued to a conventional former and is otherwise
similar in construction to the popular W4-1337 titanium driver, sporting what appears to be the same basket and neodymium magnet assembly. The low
harmonic distortion and claimed response of up to 20K sparked my interest, so a pair went into my shopping cart. These were upgraded in the final design
by the W5-1757SB which came out later and offers what I perceive as somewhat better performance.
The woofer choice required some investigation. Since I wanted this to be a transient perfect design, I needed a
woofer with a wide usable bandwidth, minimal cone breakup, an acceptable f3 at a decent maximum SPL, and
of course low distortion. After looking a several candidates, I found the Peerlesss Exclusive 830884 to be a
strong contender. This driver sports a nomex cone, and will provide an f3 below 40 Hz in a vented enclosure.
The tweeter was an easy choice when measurements and listening tests of the Tang Band mid demonstrated
sub-optimal performance above 10 kHz off axis. The choice was made easy as Wayne had built the enclosures
per my specifications, as a 2 way, and precious little baffle space was left for a tweeter. Fortunately, there was
plenty of room for the tiny ND-16. In practice, any tweeter with excellent off-axis performance above 10 kHz
would have sufficed.