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Legacy LA1020 Low Sound, No Bass

Amp powers on, all wiring is correct, i can hear sound but there is very little bass. i checked and adjusted the gain. It acts like it doesnt have enough power to drive the sub. I have a legacy LA1020, 4ch. Bridgeable. With (1) 10 inch Kicker Competition. The sub is good, the deck is good. the amp was given to me by a friend, he told me what it was doing and said to try it in my truck, and i got the same result.

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Re: Legacy LA1020 Low Sound, No Bass - Car Amplifiers

Look of rca cable is good

Posted on Aug 01, 2008

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Re: Legacy LA1020 Low Sound, No Bass

Have you checked the amp? there should be a switch on it to alow you to change the input of the power, it could be that this is on very low, causing not alot of noise and base to be produced. it could also be the remote lead to your head unit or that it isnt earthed in the best of places. if the amp power is on then you can probably say its not the earth, try checking over the amp for a switch to turn up the input, if not check the user manual and look for amp settings.

cheers, adam

Posted on Nov 18, 2007

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I have 2 12in kenwoods and a 1200 watt pyrimade amp, how can i hook these up to be the loudest

1st have your subs facing inwards towards the front of the car, not facing out the boot, This creates a better bass.

Wire 1 sub to one channel and the other sub to the other channel.

Turn down your gain as low as possible and then power everything up.

turn volume to desired loudness and then start turning up the gain slowly, if distorts a little turn in back down a notch.

avoid using bass boost, I agree it sounds great but it puts more strain on your amp and shortens its life.

after sorting out your gain, tweak all others until sound is bassy and clear with no distortion.

If you would like to use bass boost, turn on bass boost first, then up your gain etc.

Jan 16, 2013 | Pyramid PB915X 1200 Watts 2 Channel...

1 Answer

I have a 1800 watt amp but the red light is on but it dose sound like the bass works but not it its prime

the red light is for power in protect mode it should be orange and it will not emmit sound if you think you should have better sounding bass or more bass you can try to play with the gains on the amp or possibly if you have the negative or positive hooked up wrong from a speaker to the amp this will cause the bass to be lower and somewhat distorted double check your positive and negative wires from the speaker to the amp and make sure they are correct

Feb 28, 2010 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

I have a Boss OL5KD Class D Monoblock Amplifier and I set it up but is no sound coming up from the speakers, can anyone tell me how to higher the volumen? where is located the volumen??I need to higher the...

Hello maydude01,

The Boss OL5KD does not have a volume control. It has an "Input Level" adjustment which is used to match the output from your head unit preamp output to the amp. It is the first rotary control just to the right of the input jacks.

If you have no sound at all, I'd suspect that something is incorrectly connected or there is no input to the amp. First make sure that the amp power light (green LED) is coming on when you turn on the receiver and that the protection light (red LED) stays off. Then check all of your wiring, especially the RCA output cables.

Initially set the controls like this: MASTER/SLAVE switch in MASTER position (left). INPUT SENSITIVITY 2v-8v (right). INPUT LEVEL, SUBSONIC FILTER, BASS BOOST, and LOW PASS FILTER; midrange. PHASE SHIFT "0" (left). Leave the remote level control disconnected.

After you've checked all wiring and initially set the switches and controls, turn the receiver on to about 3/4 volume. Now adjust the INPUT LEVEL to the left just until you begin to hear distortion, then turn it back right just a little. Adjust the other controls for best sound. Plug in the remote level control and make sure that it adjusts the bass up and down. You're finished!

If there's still no output from the unit after checking all of the wiring, either the unit is defective, it's not getting an input from the receiver, or the sub(s) are defective.

Hope this helps.

Aug 14, 2009 | Boss Car Amplifiers

2 Answers

Amp is on, but sub wont produce any bass

Make sure the subwoofer is set to low frequency, make sure subwoofer and bass are enabled on the headdeck. Make sure the gain is turned up on the amp, make sure the rcas haven't come out of the back of the head deck.

Aug 04, 2009 | JBL GTO14001 Car Amp

1 Answer

Power to rubicon 404 no sound 4 channels of 2-way high pass

Check RCA,s at the back of the head deck, make sure sub is set to low bass frequency, make sure gain is turned up on the amp and head deck has subwoofer enabled and bass on. If you are powering speakers make sure the balance on the head deck is set to 0. Make sure it's wired up properly.

Jul 22, 2009 | Soundstream XTA240.2 Car Audio Amplifier

2 Answers

Legacy Amp 2600 watt HELP

Hello e_cody_e,

The settings you have will not break anything and may sound OK.

But they may not be optimum for getting the best bass from your system. The SubSonic setting filters out frequencies below the threshold of hearing allowing the amp to put more power into the frequencies that can be heard. So, it should be set to about the same frequency that your enclosure is tuned for or just a little lower. If your enclosure is tuned for 35Hz, then the subsonic should be close to maximum.

Similarily, the low pass sends all frequencies below the setting to the subs, (other than those blocked by the subsonic filter) and is commonly referred to as the "crossover" frequency. Typical crossover frequencies for subwoofers are 60Hz, 80Hz and 100Hz. For a ported enclosure, lower is probably better.

The phase shift should be set to the position that best synchronizes the bass with the music. Because of the additional wiring required for the subs, the signal to them is sometimes slightly delayed causing the bass to be "out-of-sync" with the rest of the music. The thump of the bass comes just a little sooner or later than expected. If the bass sounds out of phase, turn the phase shift on, otherwise leave it off.

The "gain" or level control allows you to match the amps input to your head units subwoofer output. The best setting is usually as high as possible without distortion. Set it by turning up the head unit volume to about 3/4 maximum and then advance the amp gain until your subs just begin to distort. Then back it off slightly.

These settings should allow your amp to put the most power into the frequencies that your subwoofers are designed for and hence produce the loudest and lowest bass.

Hope this helps.

Jun 28, 2009 | Legacy Car Amplifiers

1 Answer


The MRD-M300 has speaker-level inputs so you can easily use it with any car stereo. Hook it up and hear what good bass can sound like!
  • 150 watts RMS x 1 at 4 ohms
  • 300 watts RMS x 1 at 2 ohms
  • MOSFET power supply and output stage
  • STAR Topology for cleaner sound
  • Bass Engine® features:
    • low-pass digital crossover, 30-200 Hz, 24 dB/octave
    • variable subsonic filter (15-50 Hz in 5 Hz steps)
    • parametric EQ variable from 30-160 Hz
    • Bass Compensator enhances low-end definition
  • top-mounted digital control center with cover
  • time correction 0-10 milliseconds in 0.5ms steps
  • phase correction 0-180° selectable
  • digital readout
  • detachable front cover
  • blue power LED
  • delayed turn-on
  • requires 8-gauge power and ground leads — wiring and hardware not included with amplifier
  • speaker- and preamp-level inputs
  • gold-plated terminals
  • 8-5/16"W x 2-11/16"H x 11-1/2"D (10"D without front cover)
  • 1-year warranty

May 29, 2009 | Alpine MRD-M300 Car Audio Amplifier

1 Answer

Brutus 1206D

set the lp filter to about 100 to 125 (or lower if want seep boomy only) , put the bass eq no more than 75% but i would recommend no more than 50%, gain is to match the sound not to adjust power with so it is a user preference start all the way down and slowly go up till u hear distortion then turn it back down by about 10 - 15 %, phase shoild typically be at 0 degrees, subsonic depends on if you r using sealed or ported ported turn it all the way down then adjust as needed to get rid of the lower sounds you dont want (muddy sloppy sounding bass) if sealed turn it all the way up to at least 35 hz.

Jun 18, 2008 | Hifonics Brutus BXi 1206D Car Audio...

1 Answer

Optimum sound performance needed

1) legacy products are highly overrated and i have never seen one put out the power it claims
2) if you are running the amp bridged, you need to match the impedance of the speakers to the amps highest output impedance, otherwise your system will not sound all that great...

what size fuse or fuses does your amp use? what size wire did you install with (power and ground)? did you connect direct to battery or did you connect to a fuse block or similar? did you use a stiffening capacitor? does it sound like it is clipping when you turn it up or is it just distorted? what kind of box are you using for the speakers (ported, vented, sealed, bandpass)?

if you give me the model number of your speakers and your amplifier i can probably help you more, but with the information you have provided, this is all i can offer..

hope it helps,

Nov 11, 2007 | Legacy - American II: 2 Channel 2000W...

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