Ive got the amp, speakers installed and it is deafinitely louder and I have it set at ap but but I'm no sound engineer and am not sure where to set the pass. anybody got some idea what sounds best?
Thanks, Ken.

 

You want to use ALL PASS or AP. Then use the bass and treble adjust on your HU to adjust.

 

Just went and played with it and for my setup hp is way better, been riding around for a week on ap thinking the amp/ speaker upgrade was kinda a waste of money but very happy now.

 

Agree, HP sounds better to me than all pass.

 

A year later and it comes back from the dead. I had my fairing off today to install my bars and I had my amp set to HP I switched it over to AP and it seemed to sound better I have the rockford speakers as well. What do you guys think the HP is the way to go or leave it with AP?

 

its whatever sounds better to you. sound is very subjective

 

HP on the PBR300x4 every day. These amps get hot. The Ap runs way too warm.
Use HP as it filters signal lower then 80 Hz out. You can't hear that anyway on a bike.
Check the forums here plenty of threads on the topic. Use HP!!! Otherwise u risk blowing that amp. Btw also ground to the battery on the RF PBR series amps not the forks or frame! This can also cause failure of the amp. Ground to -ve battery terminal.

 

Not sure if you have an aftermarket head unit or not but if you do then you should go with AP. Any decent head unit is going to allow you to cut the frequencies individually so that you may more finely tune your sound. By indiscriminately cutting out all "low" frequencies you are potentially killing some bottom end that your speakers are capable of producing without distortion.

Most folks are using a default setting (FLAT) on the headunit EQ and when they switch to HP it sounds better because of course they are getting 6.5" coaxials to reproduce less bassy tones and for most that sounds "better"!!!

If you are running the stock H-D Harmon Kardon then HP may be best as you can only adjust bass and treble.

But as it's been said before audio is extremely subject as are musical tastes. Therefore my AP with cut frequencies may fit my genres of music although it may not suit your ears!

 

You want to use HP (High Pass). The amplifier works very hard (read that as generates 'lots of heat') in order to amplify and pass those very low frequencies that your speakers cannot faithfully reproduce. For the most part your ear cannot perceive them either, it's more of a visceral experience for your body as large volumes of air are being pumped by a speaker designed for very low bass notes. Most certainly your amplifier is wasting gobs of energy in efforts to amplify and pass those very low notes into dinky little speakers that dont have the ability to throw the speaker cones the distance required to reproduce those frequencies. This energy unused is reflected back into the amplifier as heat and an impedance mismatch.

 

I have my amp grounded to the battery and I have very irretating "hissing". Or something like that! It doesn't even matter if the bike is running, radio on/off. Just turn on the ignition and and there it is. A little hum/hiss. It's really driving me crazy!