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SOLD SWR SM-400 bass amp rackmount $265

Discussion in 'For Sale: Amps, Preamps, and Cabinets' started by Pete Hand, Nov 21, 2019.

  1. Pete Hand

    Pete Hand Supporting Member

    Jul 27, 2004
    Missoula Montana
    Amp ($265) is mounted in SKB case, also for sale ($55), link here:
    For Sale - SKB 4-space rackmount molded case $55
    Selling as separates or as a package price of $295. Does not include shipping.

    The SWR SM-400, which has been called "Legendary in the world of bass heads" by Bass Player Magazine, is a rack mountable amp, featuring a 4-band paragraphic EQ, mono and stereo effects loop, adjustable limiter, electronic crossover, stereo/bi-amp balance control. Tube pre-amp, solid state power amp. Introduced in early 1985, the SM-400 was the second model introduced in the SWR product line.

    "SWR's first “hybrid” full-range bass amplifier, the PB-200™ (later to become the SM-400), appeared in 1984. The first five units were made in a garage. There was nothing on the market like it. The PB-200 had a warm but highly accurate tube preamp, a stereo solid-state power amp and a low-noise, integrated circuit-driven tone section. It was used for the famous “We Are The World” session, at which a direct-input signal was taken from the amp (as opposed to using a direct box), a then unheard-of bass recording concept. Word spread quickly.

    Pros raved about SWR features such as semi-parametric EQ, side-chain effects loops and the Aural Enhancer™ tone-shaping circuit, all of which made for fantastic studio sounds."

    The SWR® Story

    Manual at:

    Requires 2-rack space, but it is better to mount using 3-spaces for airflow. This is not a customized Pre-400S version; it does not have a transparency knob (see photos).

    Made in Sylmar CA (pre-Fender).

    “The SM-400 Bass Amplifier provides the power, performance, flexibility and portability needed by the professional bass musician for every style of playing and nearly every situation he/she will encounter.

    To accomplish our goals, we had to use almost every imaginable type of electronic component available. This added up to an all TUBE preamp section, a limiter using Field Effect Transistors, tone and equalizer controls utilizing Integrated Circuits and two individual power amps employing discreet, solid state devices.

    The power amplifiers in the SM-400 can be used individually to provide full bi-amp capabilities when used with the built-in adjustable electronic crossover or can function as stereo, 200 watt power units. If you need more power, the amps can be bridged for 400 Watts @ 8 ohms or 420 watts @ 4 ohms.

    Front panel features include Hi and Low Gain input jacks, Gain and Master Volume controls, Integral Limiter and an exclusive feature we call an Aural Enhancer. Tonal flexibility is achieved with Bass and Treble controls and a 4 band Variable Graphic Equalizer. The Crossover Frequency Control adjusts the crossover points of the electronic crossover and the Balance control adjusts the levels of the two power amps when used in the stereo mode.

    The back panel features and XLR Balanced Out switchable for direct and line out, Crossover High and Low Frequency Output jacks, and Mono and Stereo Effects loops. A power amp assign switch selects stereo or bridge mode and for speaker outputs, there are two jacks each for left and right out or one banana jack for mono operation.”







    Last edited: Nov 21, 2019
    dpaul likes this.
  2. burgerdj


    Dec 4, 2006
  3. Pete Hand

    Pete Hand Supporting Member

    Jul 27, 2004
    Missoula Montana
    And it's gone...
  4. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

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