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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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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Posted on Jan 02, 2017

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1 Answer

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 Audio & Video

1 Answer

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 steven007_maharaj@hotmail.com and i would tell u how

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

1 Answer

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

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

Mar 14, 2011 | Rockford Fosgate Car Audio & Video

1 Answer

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 Audio & Video

2 Answers

More power output to sub


I don't know what kind of Amp you have, but you have to bridge the channels together.....For example, on a 2 channel amp you would just take the + wire from the Left channel and the - wire on the right channel and run it to the speaker. This uses the combined power from BOTH channels and funnels it right into the speaker. I hope you have a low frequency filter "LPF" adjustment. In case you are unfamiliar with this term, LPF is a function that most top-shelf amps have which will cut out most all mid-range and all high-range frequencies and put out only LOW (BASS) frequencies......At any rate, since you have a 4 channel amp, to bridge all 4 channels is a little more complicated so I am not going to elaborate too much information as of now only because I don't want to confuse you, or give you the wrong information pertaining to the wrong type of amp and have it blow up as a result of confusion....But you can bridge 4 channels typically in a similar way

May 13, 2009 | Kicker Solo-Baric L5 Car Subwoofer

1 Answer

It transmits off frequency is there a adjustment and also the frequency counter goes crazy at times


To add 10Khz to your transmit frequency:

FIXED/OFF/+10KHz SWITCH:
The left position puts the radio on
one of the three fixed channels that is selected by the channel switch
(6,19, or 21). This over-rides the channel selected by the 40 channel
knob. The right position adds 10KHz to whatever frequency you are ON.
In the middle, both features are OFF.

Otherwise, a radio tech would be able to retune the frequency inside the radio.

After adding 10KHz to your frequency, use the SWR control to check the SWR of your antenna.
Here's how:
SWR CAL CONTROL: Normally this switch is set to “PO”. Then,
during transmission, the meter indicates output power. To read SWR,
rotate this knob during transmission until the needle moves to the “SET”
point on the SWR scale. Then, while still transmitting, set the R.B./SWR
switch to SWR.

Ideal SWR is 1 but you'll want to be as near one as possible. An SWR of 1.6 or greater will make ineffective use of your antenna.
If in doubt, a radio tech has the required meters and tools to adjust the SWR/Tuning of your antenna.

May 10, 2009 | Galaxy Radios DX-73V 40-Channels Base CB...

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

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...

1 Answer

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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