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Need Infinity BU-150 schematic (amplified bass spkr) - to be used in a church. Must increase the lowest frequency.

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  • David Dunn
    David Dunn Mar 18, 2011

    When you say increase, do you mean more volume/gain? Why don't you get an equalizer instead of doing surgery and modifications that may not have the desired result? Or get more subs to move more air. Or place it near a corner. This a home speaker, not a church speaker. It has limitations.

    Register and download the users manual for free audio.manualsonline.com
    http://audio.manualsonline.com/manuals/m...

  • jharmon646 Mar 18, 2011

    Thanks.

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  • 54 Answers

I think this model is similar with ES150. you can refer schematic of ES150

Posted on Mar 18, 2011

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Bought new Infinity 8" speaker


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Is it possible to hook up 2-6x9 and 2-12in.subs to the 7540a and still pack a nice punch


yes it is however the hookup for it requires something a bit unorthodox

you have 4 outputs (bridgeable)

channel 1 and 2 must be bridged (to lower the ohms) then connected to the 2 6X9 in Parallel..
this must then be set to the high pass frequency (eliminates bass)
lower all the settings as low as possible then turn them up slightly to increase volume to a level where its the hardest and clean sounding..lower volume after

this eliminates the bass and keeps the 6x9 pushing your mid range and high range frequency

now you have 2 channels remaining,, set 3 and 4 to low pass and connect each 12" to an individual channel. (this keeps the bass and ohms high so you will get a clean bass to match with mids and high's. Dont set or bridge for a low bass as it will jam out the 6x9 and your music will sound terrible.

so there u have a simple hookup that will work and keep you sounding clean. remember not to raise the volume on the 6X9 too much as you will blow them..

Mar 29, 2011 | Infinity 7540A Car Audio Amplifier

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Thanks for the answer - If we have 3 controls as Bass, Mid and Treble. If we keep those in 12 O Clock position, will the output level be equal. In using the Bass and Treble control only (if we have...


If all are in 12 o'clock position they are "flat" (nothing has been added or subtracted foam input signal) If you only have bass & treble, yes adjusting will affect "mids" but Mids change can go both ways dependent on increase or decrease of Bass and /or treble. By increasing bass you will pull some mids up also. By increasing treble you'll subtract some mids.

Mar 17, 2011 | Audio Players & Recorders

1 Answer

Is the bass boost the gain or frequency knob?


Bass boost simply adds DB or gain to the bass signal. Some like it, some dont.
The frequency knob is the Low Pass Filter (LPF) that cuts off the amp output above
the set frequency. A bass system usually cuts off below 400 HZ and more often 200HZ.
A good, rattle your car bass note is in the 25-80HZ range or lower but most amps and audio
input devices cant attain a good low note with clarity.
"Low-pass filter allows only frequencies below the crossover point to be amplified. A high-pass filter allows only frequencies above the crossover point to be amplified - useful for keeping low bass away from small speakers, so they can play more efficiently."
Checkout Crutchfields Glossary of Car Amps.
http://www.crutchfield.com/S-LPyoWWgD5qN/learn/learningcenter/car/amplifiers_glossary.html

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Volfenhag amp adjustments


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How do I use this amplifier to amplify an ipod?


minimize ur ipod volume to the lowest & disable bass boost or lower the bass in the ipod,control vol by the amps knobs,play higher kbps songs on amp

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most likely it's your signal cable. You might first try plugging the sub into the same power outlet as the preamplifier, if it is not already.

Good luck,
BB

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1 Answer

Still no sub woofer output


SET THE CROSSOVER TO "L.P.F."POSITION AND SELECT THE LOWEST FREQUENCY AS THE CROSSOVER POINT.
[AN AMPLIFIER IS SUPPOSED TO "AMPLIFY"(TO INCREASE)ANY OUTPUT.]

TRY CHANGING THE POLARITY OF WIRES FROM AMPLIFIER TO SPEAKERS /SUBWOOFER.{it leads to cancellation of bass output.}
if u still have doubt contact me again.

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Polk subwoofer making crackling noises


Yea, now its time to replace it! the magnetic effect is weaken which makes the very bass low frequency sound to be distorted! You should re engergise the magnet of the subwoofer or should buy the new!

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