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HI i have two problems with the new amp we are installing. where are instructions for setting levels-hpf-lpf-bass eq-input ?? the amp works ok on acessory, when the car is running there is whining noise louder as ingine goes faster. as per the booklet we reconnected all ground wires but stills whines. the radio alone works fine ??? please advise thanks ART/n.j.

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Is the positive cable hooked to the battery or the fuse box and it sounds like a grounding problem

Posted on Jun 30, 2009

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I have a koiiler xm-8787 1000w amp. the problem is when i hook everything up correctly, the dual 10 inch sub make a repeating papapapapapapa none stop and doesn't produce bass. could it be the amp is...


I HAVE THE SAME AMP IN MY CAR RIGHT NOW ! THATS NOT NORMAL THATS FORSURE THERE SHOULD BE A X-OVER SWITCH ON THE SIDE OF IT SWITCH IT T0 LPF (LOW PASS) THERE SHOULD BE A DIEAL LABELED THE SAME THING ADJUST IT TI 75% TURN YOUR BASS BOOST TO 25% AND THE LEVEL SWITCH TO 25% THE HPF DIAL WONT WORK UNLESS YOU SWITCH YOUR X-OVER TO HPF BUT YOU DONT WANT THAT, THAT HAS TO DO WITH THE VOICE3 COILS IN THE SPEAKER THATS PROBABLY YOUR PROBLEM! YOU WANT TO RUN YOUR SPEAKERS WIRES PARRALLEL WITH A DOUL VOICE COIL SPEAKER IT SHOULD HAVE FOUR TERMANALS ON IT RUN YOUR NEGATIVES TOGETHER THEN RUN YOUR POSSITIVES TOGETHER AND SEE IF THAT WORKS! GOOD LUCK!!!!!

Oct 22, 2010 | Koiiler XM-6666W Car Audio Amplifier

1 Answer

I've got a 1999 ford expedition with the Mach radio system in it and it does not have any bass playing thru the front or back speakers and i've changed out the factory amp thats in the back where the sub...


does the new amp you have have a hpf setting if so check to see if thats on, turn off the x-over so it will play both lpf and hpf, bass and treble. are all the speakers wired to the amp aswell, this is the only thing that would stop bass other than the head units settings.

Jun 21, 2010 | 1998 Ford Expedition

1 Answer

When i turned the bass up to high on my head unit my amp cuts out on overprotection, just for a second and them comes back on. why?


go into your settings in the deck by holding down the volume on most models for 10 seconds then change your hpf settings and your lpf settings your bass will sound much better and not cut out. hpf recommended 160......lpf recommended 140.... good luck

Jun 03, 2010 | Car Audio & Video

1 Answer

No bass


Your amp may bet set to "HPF" which is a high pass filter. It needs to be set to LPF

Apr 13, 2010 | Kicker 02S10L74 Car Subwoofer

1 Answer

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

After installing my subs, both audio and bass comes from them. i cannot figure out why this is.


look at the low pass on the amp it lill say hpf full and lpf make sure its on lpf its a switch

Feb 05, 2010 | Car Audio & Video

2 Answers

I have a pioneer gm-x 304 amp. I want to know what are the lpf-off-hpf switches for< and what sdhould I set the input levels to?


Hello packs6,

The lpf-off-hpf switches control the "low pass" and "high pass" filters. When driving full-range or component speakers the filters are usually operated in the "off" position to send all frequencies to the speakers. When driving a subwoofer, the best position is "lpf". If you have a separate amp to power a subwoofer, this amp can be used just for the high frequencies by putting the switches in "hpf".

Input levels should be adjusted to match your receiver output. You don't want the levels so high that distortion results. But you want it high enough for the amp to be able to produce maximum output. Start at about midrange and adjust the receiver volume to a little higher than a comfortable listening level. Adjust the amp gain (level) counterclockwise until you begin to hear the speakers distort. The turn the control slightly clockwise until the distortion disappears. That's the best setting.

Hope this helps.

Sep 02, 2009 | Pioneer Car Audio & Video

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

HPF and LPF problems


it would be best to contact the retailer for the headset and get better assistance for this.

Dec 11, 2008 | Sony Ericsson W200i Cellular Phone

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

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