Question about Sony Xplod XM-554ZR Car Audio Amplifier

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Overtightened lpf i overturrned the lpf frequency knob and now that channel wont work is there any way to fix the knob or get it replaced?

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Re: overtightened lpf

Yes. but it wont be cheap to pay some one to do it. Call around to the local stereo shops find out where repairs are done in your area. Then go there ask to speak to the person that does the repairs then offer him like 20 bucks to do it on the side. Doin it your sellf I would not recomend. The input adjustment on an amp is very touchy and if you use to much solder, or to little, or jump a connection on accident or whatever youll end up with some serious noise instead of music.
Good luck buddy

Posted on Dec 25, 2007

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Is there a crossover in the ada885 sub box do i disconnect when using external amp

usually the external amplifiers have potentiometers that you can adjust called sub sonic and LPF. Find what your sub needs to be setup to and set the LPF to that frequency, usually 40-60hz.
Find the tuning of your box or the sub sonic frequency cut-off and set it there. usually 30hz and under, this will keep your subwoofer from unloading and damaging itself.

Nov 10, 2013 | Car Amplifiers

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The recommended settings for a mofet car amp 50.4 , theres a few knobs not sure what they should be turned to

The gain knob is used to control how much the volume (output) of the amp increases with each increase in volume on the deck (installed in the dash). This is used to match speakers running of your deck. Other knobs are probably for a crossover (labelled in Hz). This controls what frequencies are passed to the speakers connected to the amp. A Highpass (HPF) crossover passes all frequencies above what the knob is set for. A Lowpass (LPF) pass all frequencies below what the knob is set for. A HPF is typically used when the amp is powering component or full range speakers to keep the ultra low frequencies (anything below 90Hz) from going to theses speakers. A LPF is used when the amp is connected to a sub. Subs dont handle higher frequencies very well.

Nov 02, 2013 | Crossfire Car Amplifiers

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Channel A wont work

check to see if the signal to the amp is low pass and check to see if the switch is on high pass.. if all checks out send the amp back .. if u want to repair it email me at and i would tell u how

Jun 14, 2013 | Pioneer GM6500F 760 Watt 4 Channel...

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What is lpf switch

lpf is low pass frequency. You would want to have it turned on if you are running a sub off the amp.

Mar 26, 2012 | Pioneer GM-X962 Car Audio Amplifier

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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.

Mar 14, 2011 | Rockford Fosgate Car Amplifiers

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I have a 250 watt / 4 ohm subwoofer i have a diesel 700w amp / 2 channel / hpf or lpf with bass boost. i dont have speaker wires and want to utilize my to speakers in the back of my 2008 mustang to...

if you are trying to use it with the stock headunit you would need to buy a line output converter to use your amp and sub. after you buy the converter you will then need to splice into one of your rear speaker wires so you can run the rca's to the amp and continue with normal install

Aug 10, 2010 | Diesel Audio NS-700 Car Audio Amplifier

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What do hpf and lpf switchs do

Hello rwalinske, The abbreviations "hpf" and "lpf" stand for High Pass Filter and Low Pass Filter. They do exactly what their names imply. They allow frequencies above or below a specific setting, while blocking or attentunating frequencies below or above the setting. There's also a "band pass filter" which allows frequencies within a specific range below the high setting and above the low setting. Finally there's a "subsonic" filter which blocks inaudible frequencies below the threshold of hearing. The hpf is generally used in speaker component systems to send the high frequencies to the tweeters. The lpf is normally used with subwoofer systems and is set to send frequencies below the setting to the subwoofer. While most amps will amplify a wide range of frequencies, they are more efficient when the range is limited depending on their intended use. For example, a typical 2-channel amp might have a frequency response of 20-20KHz. When used to drive a set of normal speakers, you would not use either the lpf or the hpf, but simply let it send all frequencies to the speakers. But when used to drive a subwoofer, and operated in "bridged" mode, the amp can put all of it's amplifying power into frequencies than can be used by a subwoofer if the lpf switch is turned on. Hope this helps.

Jun 05, 2009 | Sony Car Amplifiers

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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...

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My Sub Doesnt Sound Good

The settings are all pretty much dependent on your ear. But some guide lines would be for the input gain, never turn it all the way up. Turn the gain up about half way possibly 3/4 of the way up. There should also be a filter, if you are powering subs then you want to filter out any high frequencies. So if there is a switch saying HPF or LPF you want LPF (Low Pass Frequency). Then there should be another "knob" that controls the frequency. At the least, you want your sub amp to be tuned below 50 Hz any lower is up to your ear. I hope this helped.
-Andrew Hawkins

Mar 28, 2008 | Rockford Fosgate Punch 500a2 Car Audio...

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Overtightened lpf knob

it seems like the POT is going to have to be replaced if it is broken, if the LPF won't adjust when you turn the knob eighter side then it is broken.

Dec 25, 2007 | Pyle PLA4240 Car Audio Amplifier

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