Question about Legacy LA588 Car Amp

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When put on lpf no sound comes out the sub not even bass duz this mean the filters nakerd if it is were can i get repaired in uk

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Low side of amp is bad bench test unit

Posted on Aug 07, 2009

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Mtx 801d amp turns on but no bass just high pitch sound sub is fine


if theres a switch on ur amp that says LPF Full or HPF put it on LPF for low pass frequencies

Mar 16, 2010 | MTX Thunder 801D Car Audio Amplifier

1 Answer

How do I turn my amp up...what nobs do I turn?


The purpose of the gain is to match the signal volts RMS coming from the source (CD player, etc.) to the input of the amp for correct power matching and to prevent clipping (damage by over powering).

Here is a guide that will help you set the gain correctly http://www.box.net/shared/uchv4dbk88

You'll need a multi-meter (AC voltmeter, $15 from Radio$hack), Microsoft Excel and a way to burn an audio CD from an MP3 (test tone included).

If you don't have Excel, You can downlaod OpenOffice by Java (SunMicro Systems) for free to read spweadsheets (and you thought spreadsheets were for business).

Set the LPF to just below the highest range of the frequency response of the subs. Meaning if the frequency response of the sub is 20-200Hz, set the LPF to about 180Hz

OR

set the LPF to where the other speakers start off. example, if the speakers start at 150Hz, set the LPF to about 160Hz. This overlap (or crossover - where the term comes from) is the ideal setting.

Set the subsonic (infrasonic) filter to about the same as the lowest setting in the range of the frequency repsonse of the subs. Meaning about 20Hz if that's the lowest in the range (20 -200Hz as above, if applicable).

Don't set the Bass Boost above +2dB (if applicable).

Set the phase to 0 (if applicable).


See my site for more info http://spkrbox1.spaces.live.com

Jul 31, 2009 | Lanzar MXA282 Car Audio Amplifier

1 Answer

How to ajust amplifiers (car audio)


MOST OF THE TIME U WANT UR AMP RUNNING UR SUBS TO MAKE THE SUBS SOUND REALLY DEEP AND HITE REALLY HARD BUT BE CARFULL WITH THE BASS BOOST IT CAN BE TO HIGH AND CAN BLOW UR SUBS, NOW WITH UR AMP RUNNING UR MIDS U DONT WANT A LOT OF BASS MAYBE NOT AT ALL CAUSE UR SUBS WILL HANDLE THAT, SO U WANT A LOT OF TREBLE WHICH SHOULD BE THE LPF, O AND ANY WHERE FROM 6DB-12DB WILL BE GOOD.

Jun 16, 2009 | Car Audio & Video

4 Answers

What does sub sonic mean on my Kicker kx1200.1 amp? Do it need to be off or on?


Subsonic refers to frequencies too low for the human ear to hear. Generally humans can hear frequencies in the range of 20 to 20000 hertz (cycles per second), but we hear best in the range of 1000 to 4000 hertz. High amplitude subsonic frequencies can cause damage to your speakers so many amplifiers have an electronic filter in them to reduce the amplitude of these very low frequency signals.

May 21, 2009 | Kicker KX1200.1 Car Audio Amplifier

1 Answer

Frequencies


Hello again ronnieyannon,

It's probably best to allow the amp that is powering the subs to control the frequencies going to the sub(s). I would not use the lpf on both the head unit and the amp in any case. The control settings are not completely precise and you could end up with a lot of tweaking between the units to get the sound you want. I'd send full range to the amp and with it playing something with a lot of bass, set the 401s to "LP", the crossover slope to near maximum, and then adjust the frequency until it sounded best to me. Starting on page 11 of your manual are the Rockford-Fosgate recommended adjustment procedures, including setting the gains and the filter frequency.

Those numbers for the lpf on your head unit sounds like it allows you to decrease (-24dB), as well as increase (+6dB) the bass at the specific frequencies of 50, 63, 80 and 100Hz. You probably don't want to decrease the bass boost for subs. And the 401s will allow a boost up to 12dB and is variable from 50-250Hz.

Hope this helps.

Apr 24, 2009 | Rockford Fosgate Punch 401S Car Audio...

1 Answer

What duz level adjustment do


Hello,

The level control controls the input level coming from your head unit (receiver) to the amp.

Your Sony users manual is a little vague on how to best adjust the level and other controls.

Here is one method that some installers use and works well with most amps.

Most 10" subs sound best between about 80-100hz and below, so start out by setting the LPF at about 80hz. The HPF will not be used. Next turn the bass boost and gain all the way down. Turn on the radio and set all tone controls, bass, midrange, treble to flat, usually "0" on most head units. Turn the volume up to approximately 3/4 volume level or just until you begin to hear distortion. Now, back the volume down until the distortion is gone. Next turn up the gain control on the amp until you hear the subs start to distort then back the gain down until the distortion disappears. Next turn the bass boost up again until the subs begin to distort, then either back the bass boost down or back the gain down until the distortion is gone. You may need to play around with the bass boost and gain controls to get exactly the sound you prefer.

Hope this helps.

Mar 28, 2009 | Sony Xplod 1100 Watt Max 10" Subwoofer,...

1 Answer

Probems with my kenwood 7020 amp


The ground nearest "batt" connection is your main ground. The other "GND" is for grounding shielded RCA cables.

If the amp is being used to run subs alone:
  • Set the Bass Boost to 0.
  • Set the LPF Frequency to about 80.
  • Set the Input Sensitivity to 5 (the minimum).
  • Set the Filter to LPF.
If things sound fine at these settings, one at a time, slowly bump the Bass Boost and the Input Sensitivity up, checking the sound quality as you go.

Mar 31, 2008 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

Hooking up a new 8" woofer speaker to my amplifier


If I'm reading the amp manual right, you should be able to connect the amp in 3 channel mode. To do this:
  • Connect both left door speakers in parallel to Ch A Left.
  • Connect both right door speakers in parallel to Ch A Right.
  • Bridge Ch B and connect it to the new 8" sub.
  • Set the Ch A LPF/HPF to HPF.
  • Set the Ch B LPF/HPF to LPF.
This should allow you to run all 4 door speakers and the sub from the amp. It will also automatically route non-bass to the door speakers and "only bass" to the sub.

Mar 22, 2008 | Pioneer GM-6300F Car Audio Amplifier

1 Answer

Dual voice coil speakers


best way to do this to preserve your amp and speaker is to wire the speaker Voice coils in series.

VC1 = Voice coil 1

AMP + to VC1 +
VC1 - to VC2 +
VC2 - to Amp -

Set you amps bass gain down very low. Crank up the volume with a bass test audio track. Turn the switch to LPF or Low pass filter. Adjust a LPF to about 60 hz Adjust the bass gain up until your Sub begins to sound sitorted or choppy. Then tune the bass gain just below where it distorts. Then you are set.

Dec 07, 2007 | Jl Audio 12W6v2 Car Subwoofer

1 Answer

Protect light


Set your Filter Switch to LPF.  Turn the Bass Gain/ level all the way down temporarily. Set your Crossover to below 100HZ.  Then Turn on the system with a Bass test sound.  Turn up your bass Gain/level until you get distortion.  Then turn it back till you just get the distortion out. Then do not warn everyone that you will De-nad them if they touch your settings.

Oct 23, 2006 | Jensen JXP680 Car Audio Amplifier

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