Yamaha LS9 HPF questions

[helper1112]

Hi all,

I am a newbie to the sound world and I am working with my church on the sound board. I am wondering what is the purpose of the HPF and what do I want it turned on for? We had it set on for the singers, but nothing else. Should this also be on for the guitar and keyboard? What about the pastor or other speakers? How would I know when I have the levels adjusted properly for it?

Thanks for any help...

Andrew

[Gracetech]

HPF stands for High Pass Filter

What it does is take out low frequency information and allow High frequencies to pass by. I use HPF's quite liberally. I will use them on just about everything. Becuase you have a variable HPF you can choose how much LF you want to remove. On female voices you may have the HPF as high as 160Hz and on male voices it will be closer to 100Hz. The idea is to remove as much LF noise from each source to reduce the muddy sound you can get from adding all of those sources together. This also helps your woofers to be more efficient and accurate.

crt

[SamG269]

Although we dont have an LS9 we do have a GL2400. Would using HPF be just as effective on an analog board as a digital?

[daver2]

It should be.

In fact, the analogue filter should be 'better' at it

Dave

[helper1112]

Hello,

Thanks all for the info. I am wondering would it be good to use this on the instruments, as we at this time only have the electric piano and guitar hooked up, or should these be left with hpf off?

Thanks again for the info...

[waynehoskins]

Basically, any source that shouldn't have low-frequency content should probably have the high-pass engaged. Vocals, speech, guitars, etc. The big ones that shouldn't be high-passed are kick drum, bass, synth (especially organ), playbacks.

[helper1112]

Thanks a ton, that helps a lot. I will set that up this weekend.

Have a great day...

[SamG269]

On the board would that be pushed in to turn on our pushed out?

[Gracetech]

Pushed in, atleast on the thousands of boards i have worked on.

crt

[helper1112]

Followup question on the HPF, what is the best setting for the guitar around what hz? Or how can I tell when I have it right?

Thanks again for the help...

[Brad Weber]

This is one of those areas where the best approach is to try it, play with it and see what works best for you. From a mix perspective, having the high pass filter engaged, and set as high as possible if a variable filter, helps clean up the mix the most. However, that can also readily make many sources sound very 'thin'. What works best for each situation is going to be the result of the specific source involved, the mixer, the combination of sources, your system and the acoustical conditions. And it can even vary for sources, for example not all vocals are the same and thus different vocalists may get optimal results with different settings.

[Tim Padrick]

As you sweep the HP frequency up, you will eventually start to hear a change. Keep going until it transitions from a good change to a bad change, then back it off. Given the proximity effect* of most mics - especially vocal mics - you may end up with the HP dialed up as high as 200Hz or more. "If it sounds good, it is good".

*http://www.padrick.net/LiveSound/Proximity.jpg