tuning the hp filter on a sub

[d1reyad 10+ year member]

i just install a sub and a amp to power it the amp has both hpf and lpf crossover i wanted to know two things my MTX x702 has on the LPF crossover lpf switch and a frequency multiplier switch what dose that do also can you turn on the HPF on a subwoofer or will it damage the sub dual voice coil?

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[tinmanchris217 10+ year member]

Chuck Norris called... you can can have your punctuation back.

"I just installed a sub, and an amp to power it. The amp has both hpf and lpf crossover.

I wanted to know two things:

1) My MTX x702 has the LPF crossover switch ON, and a frequency multiplier switch. What do they do?

2) Can you turn the HPF ON for a subwoofer, or will it damage the sub?"

Chuck's answer:

- LPF(Low Pass Filter) does exactly as the name implies. It allows any frequency LOWER than the set value to pass through the filter. If it's set to 120 Hz, then 120 Hz will be at half of the volume of all of the sound from 20-100 Hz.

- HPF(High Pass Filter) is the opposite, allowing any frequency significantly higher than the setting, to pass through at full volume. It will NOT damage the sub, when used, but it may filter SO MUCH of the signal, that you don't hear any sound from your subs.

Side note: If you have heard of a sub-sonic filter, it is a HPF, that operates at very low frequencies (10-50 Hz) to prevent your subs from bottoming out.

- Frequency Multiplier is not something I hear very often, but I imagine it is the bass boost. If you set the LPF appropriately for your subs, and the gains are set, so you aren't clipping, I would leave the Frequency Multiplier at +0dB.