Bag End INFRASUB-18 Self-Powered 18" Sub !
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Ships from | Los Angeles, CA, 90077 |
Ships to | United States and Canada |
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Shipping carrier | UPS |
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The
Bag End INFRASUB-18:
This is a very effective self powered subwoofer system employing
a direct radiating 18" cone loudspeaker in a sealed enclosure and a
500 Watt power amplifier mounted to an aluminum plate on the back of the
enclosure. The amplifier also includes a built in INFRA dual integrator
providing a flat acoustical response down to 8 hertz, well below the audible
range of human hearing.
ONLY REASONABLE Offers Considered ! ! !
APPLICATIONS:
Home Stereo - Home Theater - Project Studio
FINISHES:
Studio Black
DESCRIPTION:
The INFRASUB-18 is a self powered sub woofer system employing a direct
radiating 18" cone loudspeaker in a sealed enclosure, and a 400 watt
power amplifier mounted to an aluminum plate on the back of the enclosure.
The circuitry also includes an INFRA dual integrator providing a flat
acoustical response down to 8 Hertz, and Left, Center, and Right channel
line level inputs and hi-pass filtered outputs.
DESCRIPTION:
The reason that the INFRA type subwoofers sound dramatically better than
the others is because of their superior time domain performance. The INFRA
subwoofer maintains the bass energy in a tight packet, aligned with the
upper range signal, providing a seamless musical connection with the main
loudspeakers. This is achieved by making the system have a very wide,
very flat frequency domain response.
The INFRA driver is
operated below resonance and flattened with an electrical boosting circuit,
the INFRA dual integrator. Below resonance the INFRA system exhibits predictable,
uniform response and reproduces each note with the same emphasis, reducing
the influence of the resonances found in conventional above resonance
bass systems. In addition, the use of a low pass filter is eliminated
(and with it the associated long variable delay) and replaced with the
INFRA dual integrator and its short uniform delay.
Upon close listening
it is clear that the impression of power and impact is greater with an
INFRA system when compared to conventional bass systems. This is true
even when the two systems will measure the exact same SPL on a calibrated
dB meter. The superior transient response of the INFRA subwoofer provides
a greater body impact than a conventional subwoofer does, at all listening
levels.
Objectively the INFRA
system exhibits superior frequency and phase response.
DOWN TO 8 HERTZ:
The INFRA is a no compromise technology with a great degree of flexibility.
By extending the frequency response down a full octave below what is considered
to be the lowest musical note, low C on a pipe organ (16 Hz), we improve
the phase response and reduce the delay throughout the entire audible
bass range. This excellent phase response and short signal delay is why
subjectively the INFRA system is known for its quick, tight, and musically
connected bass sound throughout the entire bass range, not just the lowest
frequencies. With itís good phase and extended frequency response,
it can more accurately represent the character of the sound being fed
into the system than conventional designs and their long signal delays.
FILTER:
The Dynamic Filter circuit is a complimentary technology to the INFRA
dual integrator. It insures that unexpectedly large signals will not overload
the system resulting in possible damage or audible distortion. This allows
high level operation close to the maximum system capabilities without
fear of accidental overload.
The Dynamic Filter
circuit dynamically reduces the bass extension to prevent overload. It
is inherent in the INFRA design that an overload condition will occur
with the lowest notes first, as they require the greatest amount of amplifier
power and driver excursion. In an overload condition the Dynamic Filter
circuit will reduce the lowest frequencies to their maximum safe level
while not affecting the bass content above the frequency that exceeded
the threshold.
The INFRASUB-18 Dynamic
Filter threshold is not user adjustable. It has been factory set to 3
dB below the amplifier overload point. The maximum sine wave output power
from the amplifier is 400 watts. With the Dynamic Filter detector engaged,
the maximum sine wave output power is 200 watts. The full power of 400
watts or more is reserved and available for short duration impact.
The Dynamic Filter
is fundamentally different from the commonly used limiter which reduces
the level of the entire sub woofer output, and is much more audible, when
engaged. It is more natural not to hear the lowest frequencies and still
hear the upper bass unaffected, as often there are sounds in nature without
low bass content. It is not natural, and very noticeable, when the entire
bass range limits to protect itself. When used in moderation the Dynamic
Filter is very subtle and conceals very well the fact that it is working.
When the system is turned up too far, the low bass is reduced to the point
that only the upper bass is heard. If the user requires this much sound
pressure, then more amplifiers and speakers are required to achieve the
desired level along with the extended low frequency response.
LOUD AT 8 HERTZ:
While the INFRASUB-18 will reproduce 8 Hz, it is not audible nor does
it have enough acoustical power for you to feel it. The measurements are
taken at close range with sensitive instruments. To achieve a flat response,
full amplifier power is used at the lowest frequencies and very little
(<1 watt) in the upper frequency range. The INFRA dual integrator provides
the correct signal strength and therefore amplifier power at each frequency.
As the frequency is lowered the power and excursion required to maintain
a flat acoustical response at high SPL become enormous and not practically
attainable for a single driver system. Fortunately the improved phase
response, one of the main benefits of an extended subsonic acoustical
response, is preserved because the music content is typically not demanding
high power subsonic reproduction.
The ideal listening
scenario is to have a full bandwidth 8 Hz playback system and play a good
recording without low frequency noise present on it. The playback system
can then benefit from the improved phase response without requiring excessive
power in the lowest octave or engaging the Dynamic Filter circuit.
THE BASS LEVEL:
If your application is in a recording studio, you should use professional
acoustical measurement instrumentation to set the bass level correctly.
For home applications you can set the INFRA level as desired for your
personal taste. You will probably find large variations in the amount
of bass energy on various recordings. Until recently there has not been
enough attention to low bass monitoring in the recording studio, post
production and mastering process to insure a low noise, uniform low bass
response on the recording. With an INFRA subwoofer system, you are able
to hear the bass with definition and clarity never before available, making
it easier to identify not only the basic level discrepancies, but also
the subtleties of the recording environment ambiance and the bass instrument
character.
OVERLOAD PROTECTION:
The duty cycle of even the most demanding bass heavy musical material
played at full level is below the high temperature protection shut off
setting. Occasionally, when playing a poorly mastered CD with high level
sub-sonic noise on it, or when running very dense material highly concealed,
the system will self protect and shut off for a short time. If this occurs,
turn the level down and/or examine the source material.
INSTRUCTIONS:
If you have a line level source (such as a preamp output, surround processor
output, or tape monitor insert points on a receiver), send a full frequency
range signal via shielded cables to the RCA jack line level inputs. The
INFRASUB will send the Left, Center, and Right channel signals to the
built-in hi-pass filters. The resistor network installed at Bag End sets
the -6 dB frequency to 95 Hertz. The line level outputs of the hi-pass
filters are available at the Left, Center, and Right channel RCA jacks.
Send these signals back, via shielded cables, to the inputs of their corresponding
power amplifiers.
If you have a speaker
level source (the output of a power amplifier), send a full frequency
range signal to the Left and Right channel spring terminal speaker level
inputs. As the impedance of this input is high, it is not necessary to
use heavy gauge speaker wire for these connections. We recommend running
separate cables in parallel with your normal speaker wires connected either
directly from your amplifier outputs, or from the terminals on your left
and right speaker enclosures. Please take care to maintain the correct
signal polarity by connecting the red or + terminals from your amplifier
or speaker to the red speaker level inputs on the INFRASUB. Note that
there are no hi-pass filtered speaker level output signals available.
In this configuration best results will be achieved when using satellite
speakers with limited bass response.
The INFRASUB combines
the signals from all of the inputs and sends them through the INFRA dual
integrator and to the built-in 400 watt power amplifier and the specially
designed Bag End EL-18P 18" driver. Use the LEVEL control to match
the volume of the INFRASUB to your satellite speakers. Use the POLARITY
SWITCH, if necessary, to reverse the polarity of the INFRASUB. This can
be helpful to achieve a seamless blend between the sound of the INFRASUB
and your satellite speakers.
Specifications:
Enclosure:
3/4" MDF
Low Frequency Transducer: EL-18T 18" Cone
Amplifier Output Power: 500 Watts continuous sine wave
INFRA Module:
8 Hz dual integrator
System Type: 3 cu. ft. Sealed box
Driver Nominal Impedance: 4 Ohms
Input Connectors:
Left, Center, and Right
channel line level RCA jacks
Left and Right speaker level spring
terminals
Hi-Pass Outputs: Left, Center and Right
channel line level RCA jacks
Hi-Pass Filters: 12dB per octave, -6dB at 95 Hz
Frequency
Response: +/- 3dB 8 Hz to 95 Hz (2 pi Steradians)
Overload Protection: Preset threshold Concealment(tm) circuitry
AC Power : 115 or 230 internal switches
Finish: Black textured paint
Grille: Black nylon cloth on frame
Dimensions:
23.5"h x 21.5"w x 18.5"d
59.7 cm x 54 cm x 46.3 cm
Weight: 91 lbs. (41.05 kg)
Shipping Dimensions:
30" x 27" x 23.5"
74.3 cm x 67.3 cm x 59.1 cm
Shipping Weight: 103 lbs. (46.72 kg)
Weinhart Design has lots of other items
new and used and if you're in Los Angeles or visiting please accept my
invitation to experience our World Class Audio Showroom and please visit
our web site @ www.weinhartdesign.com
We are always interested in purchasing quality Audio and Video items,
CD & LP collections and most quality trades are welcomed.
If youre in Los Angeles or visiting please make it a point to visit
our new world class Los Angeles showroom and experience what is
possible.
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All sales out of California are State Sales Tax exempt.
California State Sales Tax of 9% only is collected for items received in California.
We accept payments by Bank Wire Transfers and bank checks without fees on sales over $1,000.
Please call me directly in my world class showroom in Los Angeles
weekdays 11-4PM @ 310-472-8880 or any reasonable time on my cell including
weekends from Los Angeles time 10-10PM @ 310-927-2260 and I can answer your questions and help you
with all of your new and pre owned needs.
Making Better Audio Systems better one system at a time,
David Weinhart
Weinhart Design, Inc.
President & CEO
e: [email protected]
www.weinhartdesign.com
The Audio and Video Expert
2337 Roscomare Road, Studio #1
Los Angeles, California 90077
Cell Los Angeles Time ONLY 10-10PM @ 310-927-2260
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