Dual Opposed Mounting and
Direct Servo Technology
Dual opposed subwoofers mount
two drivers on opposite walls of enclosures in an effort to reduce
the reaction force exerted onto the enclsoure from drivers . However,
the disadvantage of the conventional non-servo dual opposed subwoofers
is the boxy bassinside the enclosure is still audible with re-radiation
via the cones. With our patented Direct Servo technology, it enables
precise control over the cone to resist and dissipate any energy
acting on the cone and the so-called re-radiation of boxy bass coloration
can be reduced by up to 10x in energy. This 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 reduction of the re-radiation
of bass from inside the box, which is commonly referred to
as boxy bass.
- The effects of 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
- Mechanical and thermal memory
effects are reduced, further improving transient response
- The (temperature-independent) effective
in-box Q value is 0.3 (0.1 for driver itself) resulting in much
tighter and accurate bass than conventional designs with typical
value of 0.8-0.9 (and even higher when voice coil becomes hot)
Read more about Direct Servo in our technology section.
View animation demonstrating how Direct Servo works 
HX2000XLR3 Amplifier and
Dual DS1520 Driver
G25HP comes with grilles. The above
photo is shown with grill taken off. It uses our new high power
HX2000XLR3 servo amplifier and two DS1520 driver. DS1520 features
anodized aluminum cone, a 3" voice coil, and 200 oz magnet.
Its linear excursion range has increased to +/- 20mm.
The quickguide of the HX2000XLR3 amplifier
for sealed subs can be found
here . The installation guide can be found here.
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.
G25 has received AVS 2018 Top Choice Award.

Introductory price includes freight shipping
to 48 US continental states only. Shipping to other region or country
should inquire us for actual cost. Each G25HP sub comes with
complimentary mover pads for either carpet or hard floor, but not
both. Please select one in the order.
All G25HP flat white is on back order till
mid Jan. Please sign up for waitlist.
Customers in Hong Kong alert: we have only
sold one piano finish unit in Hong Kong and unfortunately that unit
has been blacklisted due to a credit card fraud. We will not provide
any service to blacklisted units. Please check with us for details
if you intend to buy a used G25HP in that region.
A few things to note for freight delivery:
1) Freight delivery is not as date-accurate as UPS ground delievery.
Do prepare for unexpected delay, 2) If the order can be delivered
without appointment/signature required, there is a $30 credit. Please
use the order button to do so. The options available in the checkout
process are for UPS ground only, and 3) All freight delivery included
with the price is standard curb side delivery. Inside delivery and
gararge delivery are extra and please ask us for a quote.
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Description:
FREE SHIPPING to 48 US continental STATES |
Price |
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G25HP black oak finish with
HX2000XLR3 amplifier and dual opposed black cone driver with
freight shipping |
$2650
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G25HP black matte finish with
HX2000XLR3 amplifier and dual opposed black cone driver with
freight shipping |
$2650
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G25HP-SE piano black finish
with HX2000XLR3 amplifier and dual opposed black cone driver
with freight shipping |
$3000
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G25HP-white flat white finish
with HX2000XLR3 amplifier and dual opposed black cone driver
with freight shipping (back order till early Mar) |
$3000
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Delivery without
appointment/signature required (per order) |
$-30 |
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Upcharge for
shipping to New York City and Long Island(per unit) |
$150 |
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Upcharge shipping
to these states: WA/OR/MT/ID/VT/MA/NJ/NY(per unit) |
$100 |
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A set of 4 large
furniture mover pads for carpet |
$10 |
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A set of 4 large
furniture mover pads for hard floor |
$10 |
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