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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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Fujitusi multimedia projector about its lumens and prices


The Fujitsu LPF 4800 has 1500 lumens and was first sold back in 2001. Then 3 years later they stopped selling it. It cost about US$6000 when it first hit the market.
Hope that answers your question.

Mar 18, 2011 | Fujitsu LPF 4800 Multimedia Projector

1 Answer

Turn vocals off


If its a sub amp.....There should be a switch that says lpf/full/hpf....Make sure its on lpf (low pass filter....)

Nov 16, 2010 | Kenwood eXcelon X1200M Car Amp

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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

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

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

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

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

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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