Finesse meets brute force
Our servo technology is scalable
to all subwoofer designs as well as driver size. F18 is our largest
single driver sealed subwoofer to meet the needs for a high power
home theater solution that retains the dynamic, accurate, and deep
bass that we have become known for. Its max output at 20hz is at
least 8db higher than that of our 12" sealed model F12 and
more than 11db higher than our competitior's 12" model SB**
measured by data-bass.com.
The amplifier is based on Hypex audiophile class-D module. With
the combination of the servo feedback and stiff aluminum cone, we
have achieved lower distortion than competitor's 18" servo
subwoofers (DD18+) with the same or even higher maximum SPL output
from 10hz to 100hz , as tested at data-bass.com.
In fact, F18 has recorded the lowest THD numbers at the maximum
SPL output than any other subs tested. Our servo technology is scalable
to all subwoofer designs as well as driver sizes.
Direct Servo Technology
All our subwoofers use our patented Direct Servo technology. The servo enables precise control over the cone which is essential for tight, dynamic and accurate bass. It also counteracts many different driver non-linearities and allows us to use lighter drivers which avoid the need for excessive amounts of amplifier power.
Some of the benefits of Direct Servo include:
- Dramatic boxy sound reduction of the re-radiation
of bass from inside the box
- Thermal compression
are eliminated under normal operation
- Higher efficiency
allowing output which would normally require a more powerful amplifier
- Deep bass extension can be achieved using
a low mass driver with superior transient response
- Mechanica creepl memory
effects are reduced, further improving transient response
- The (temperature-independent) effective
in-box Q value is 0.25 (0.1 for driver itself) resulting in much
tighter and accurate bass than conventional designs of in-box
Q value of 0.75-0.80 (and even higher when voice coil becomes
hot)
Read more about Direct Servo in our technology section.
View animation demonstrating how Direct Servo works
HX1000XLR3 Amplifier and
DS1820 Driver
F18 comes with a grille. The above photo
is shown with grill taken off. It uses our new high power HX1000XLR3
servo amplifier and metal cone DS1820 driver. DS1820 features anodized
aluminum cone, a 3" voice coil, and 240 oz magnet. Its linear
excursion range is +/- 20mm.
The response curves with various extension
frequency/damping combinations of both amplifiers can be found in
our EQ page.
The sub comes with standard screw-in rubber
feet. Chrome spike feet are sold separately. The price includes
UPS ground shipping to 48 US continental states only. Overseas shipping
is extra and requires quote before placing order. Multiple subs
will be shipped via freight.
Documentation:
Quickguide
Integration guide
We will not ship to commercial address without
public listing due to CC fraud concern. Exception can be requested
via email and phone calls.
There is a $150 surcharge per unit to shipping
to New York City and Long Island as freight companies charge more
in NYC and Long Island. There is a $150 surcharge per unit to shipping
to Washington State.
Warehouse will be
closed between Sep 24 and Oct 16. There will be no shipping from
us and Ascend Acoustic during this period of time.
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Description:
with US 48 states shipping included (overseas customers who
need air shipping please do not place order with these links) |
Price |
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F18-SE piano black finish
with HX1000XLR3 amplifier and black alu cone driver |
$2070
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F18 black oak
finish with HX1000XLR3 amplifier black alu cone driver and 48
states shipping |
$1849
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F18 black matte finish with
HX1000XLR3 amplifier black alu cone driver and 48 states shipping
(back order till late Oct) |
$1849
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Change to silver cone driver for one F18 subwoofer |
$120 |
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Independent Lab Test Results
of Low Distortion and Textbook-like Impulse response
The independent test lab site www.data-bass.com
has published the max distortion numbers for F18 and Velodyne DD18+
(courtesy of Josh Ricci). The F18 has lower distortion and yet more
output than Velodyne DD18+ for 1/3 of the price. In addition, the
test results also include the impulse response of 18hz high damping
which shows minimal ringing, a testament of F18 articulation bass
sound.
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