Jim Holtz's:
Design Goals / Driver Selection
Curt: For the final chapter of the Statements saga, (Yes, really the final
chapter this time!) we present a small monitor version of the statements.
Jim chose a TMW topology and utilized a single Tang Band W4-1337SA,
the Fountek NeoCd3.0 ribbon, and a single Dayton RS180-4. The woofer is
vented, and (of course) the mid in open backed. As before, Jim was the
mastermind behind the concept and enclosure design, and I pitched in for
crossover duites, and Wayne did the final voicing. . The f3/f10 models as
34Hz/26Hz respectively. Expect max SPL's around 104dB.
Jim: The Monitor Statements were a result of feedback after the
Statements/Mini Statements designs were completed. A center had been
planned from the start, so when people started making comments that they
really liked the Statements but they were simply too big, the Mini and
Monitor projects started to take shape. Curt made the comment that once
we published the center design, someone would build three and stand two
of them on end for mains. That is when the Monitors officially came to life.
The goals we wanted to achieve for the Statements series speakers were to
retain the Statements open, spacious mid range, the sparkling top end and
still have good solid bass down into the 30's but in a much smaller cabinet.
Using a W/M/T configuration, the RS180-4's woofer, W4-1337SA midrange
and Fountek NeoCD3.0 ribbon seemed like the perfect combination and an
extension of the center design philosophy so they could be used as either
mains or surrounds. The RS180-4 version was selected after evaluation.
We found the 4 ohm version of the RS180 had extended bass just like the 8
ohm but with a higher sensitivity which allowed more flexibility in amp
selection.
Listening to the Monitors provided a surprise in just how much bass they
are capable of. The sounds quality mimics the rest of the Statements series
including deep bass, but with less impact. The mids and highs have all of
the same sound qualities of the Statements but in a much smaller package.
Cabinet construction:
Jim: The cabinet design and construction is very similar to the Mini
Statements in that it uses a mid driver transmission line/pass through with
an open back. The construction of the mid tunnel ties into the sidewalls with
vertical braces shown in the cut list, which strengthens the cabinet greatly.
The cabinet measures 22"H x 10 ½"W x 12"D and works out to a 28 liter
ported enclosure for the RS180 with a net volume of about 24 liters after
the mid tunnels are factored out. A Precision 2" port kit was selected for the
Monitors. We felt it was very important to have inner/outer flares to
eliminate port noise so the Precision kit was the logical selection. The tube
length is 3" which combined with the flares equals an over all length of 8"
total for a cabinet tuning of 34 Hz. I used 2" wedge foam to line the inner
cabinet walls behind the RS180 but fiberglass can be used with equal
success. However, be sure not to block the path to the port.
Continued....
Curt: For the final chapter of the Statements saga, (Yes, really the final
chapter this time!) we present a small monitor version of the statements.
Jim chose a TMW topology and utilized a single Tang Band W4-1337SA,
the Fountek NeoCd3.0 ribbon, and a single Dayton RS180-4. The woofer is
vented, and (of course) the mid in open backed. As before, Jim was the
mastermind behind the concept and enclosure design, and I pitched in for
crossover duites, and Wayne did the final voicing. . The f3/f10 models as
34Hz/26Hz respectively. Expect max SPL's around 104dB.
Jim: The Monitor Statements were a result of feedback after the
Statements/Mini Statements designs were completed. A center had been
planned from the start, so when people started making comments that they
really liked the Statements but they were simply too big, the Mini and
Monitor projects started to take shape. Curt made the comment that once
we published the center design, someone would build three and stand two
of them on end for mains. That is when the Monitors officially came to life.
The goals we wanted to achieve for the Statements series speakers were to
retain the Statements open, spacious mid range, the sparkling top end and
still have good solid bass down into the 30's but in a much smaller cabinet.
Using a W/M/T configuration, the RS180-4's woofer, W4-1337SA midrange
and Fountek NeoCD3.0 ribbon seemed like the perfect combination and an
extension of the center design philosophy so they could be used as either
mains or surrounds. The RS180-4 version was selected after evaluation.
We found the 4 ohm version of the RS180 had extended bass just like the 8
ohm but with a higher sensitivity which allowed more flexibility in amp
selection.
Listening to the Monitors provided a surprise in just how much bass they
are capable of. The sounds quality mimics the rest of the Statements series
including deep bass, but with less impact. The mids and highs have all of
the same sound qualities of the Statements but in a much smaller package.
Cabinet construction:
Jim: The cabinet design and construction is very similar to the Mini
Statements in that it uses a mid driver transmission line/pass through with
an open back. The construction of the mid tunnel ties into the sidewalls with
vertical braces shown in the cut list, which strengthens the cabinet greatly.
The cabinet measures 22"H x 10 ½"W x 12"D and works out to a 28 liter
ported enclosure for the RS180 with a net volume of about 24 liters after
the mid tunnels are factored out. A Precision 2" port kit was selected for the
Monitors. We felt it was very important to have inner/outer flares to
eliminate port noise so the Precision kit was the logical selection. The tube
length is 3" which combined with the flares equals an over all length of 8"
total for a cabinet tuning of 34 Hz. I used 2" wedge foam to line the inner
cabinet walls behind the RS180 but fiberglass can be used with equal
success. However, be sure not to block the path to the port.
Continued....
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Statement Monitor
Enclosure drawings
courtesy of Brian Walter
courtesy of Brian Walter
