Anybody know if the Ampeg PF350 has a built in HPF

Discussion in 'Amps and Cabs [BG]' started by Stewie, Jul 14, 2021.

  1. Stewie


    Jul 3, 2013
    Near Boston
    …..and if it does, at about what frequency does it start to cut? I have an Fdeck HPF but need to know if I need to use it. Thanks in advance
  2. jeff7bass

    jeff7bass Inactive

    Apr 9, 2009
    Not sure about the HPF the the limiter kicks in when you push it, even when it's off. I had an early one though so the newer ones might be different.
  3. superheavyfunk


    Mar 11, 2013
    I’m gonna go ahead and say “no it doesn’t”
  4. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Endorsing: Yamaha, Ampeg, Line 6, EMG
    It goes pretty low so if there is one, and there might be, it doesn't cut much low end off.
    MarkA likes this.
  5. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    There is a 2nd order HPF present, looks pretty low.
    MarkA, Jazzdogg and BasturdBlaster like this.
  6. Use your ears in any particular situation to decide if it's needed. I find it's more dependent upon the venue conditions than the amplifier. I always take mine along.
  7. Stewie


    Jul 3, 2013
    Near Boston
    Not about tone, asking for the sake of protecting a wonderful, but delicate loudspeaker. And no, the PF350 doesn’t seem to have much in terms of an HPF circuit. It’s getting harder and harder to avoid pulling the trigger on a Mesa 800+
    Last edited: Jul 15, 2021
  8. If you are concerned with protecting a delicate speaker from damage by low frequency signals then you should definitely always use your HPF. I'm not sure changing to a significantly more powerful amp is going to help protect your speaker? It's an interesting approach though.
  9. Jazzdogg

    Jazzdogg Less barking, more wagging!

    Jul 29, 2006
    San Diego, CA
    Use your FDeck, and your ears, until you buy an amp equipped with a variable high-pass filter. I won't gig without one!
    Sparky Mark likes this.
  10. Stewie


    Jul 3, 2013
    Near Boston
    I’m not as dumb as you seem to think. I was asking if there was an HPF, and if there is, at what frequency. If there was one at say 40 hz, I wouldn’t need an Additional HPF. At the 2 ohm setting, a Mesa 800+ probably has similar power to an eight ohm speaker as my PF 350. I don’t play loud enough to worry about the speaker except for the excursion possible at very low frequencies. The Mesa has a variable HPF built in, saving setup time and extra complication, not to mention likely sounding way better than my little Ampeg, but thanks