Bag EndINFRASUB-18usedBag End INFRASUB-18 Self-Powered 18" Sub !The Bag End INFRASUB-18: This is a very effective self powered subwoofer system employing a direct radiating 18" cone loudspeaker in a sealed en...595.00

Bag End INFRASUB-18 Self-Powered 18" Sub !

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davidamb 

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Ships fromLos Angeles, CA, 90077
Ships toUnited States and Canada
Package dimensionsunspecified
Shipping carrierUPS
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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

INFRASUB-18

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.

INFRA

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.

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.

DYNAMIC

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.

HOW

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.

SETTING

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.

AMPLIFIER

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.

OPERATING

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 you’re in Los Angeles or visiting please make it a point to visit
our new world class Los Angeles showroom and experience what is
possible.

VISA, MC and Paypal are only accepted in the United States and Canada for transactions using VISA, MC and Paypal we add 3% to cover the costs.

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

Showroom Weekdays 11-4PM @ 310-472-8880
Cell Los Angeles Time ONLY 10-10PM @ 310-927-2260



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