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Gallien-Krueger Fusion 550 Hybrid Valve Bass Amplifier   (Open Box)
Ships Internationally
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SKU   482104   000000000
OVERVIEW

With motorized knobs for two storable settings.

The Gallien-Krueger Fusion 550 is GK's first bass amp head featuring an all-tube preamp. The Fusion 550 bass head incorporates a uniquely designed 6-stage tube preamp paired with a 500W version of the high-current solid-state power amp used in the GK 1001RB-II. The rich warmth of tubes, combined with the quick, punchy power that G-K bass amps are known for, is an aural experience you must hear to believe.

As if that wasn't enough, GK has inventively incorporated motorized knobs into the Fusion 550 head that allow you to store two different settings. This gives you the ability to dial in a separate overdrive or slap tone and footswitch between them--a first for a fully analog bass amplifier.

The Fusion 550 amp also features a simplified version of GK's exclusive 50-W Horn Bi-Amp System. Dial in the horn where you like it, and as you adjust your volume with the master control, the ratio between the woofer and tweeter is preserved. Other features include a tube driven 4-band active EQ and voicing filters with a frequency select for the contour control. The rear panel features include Neutrik Speakon and 1/4" speaker output jacks, effects loop, tuner out, and a footswitch input jack. It also has a DI output which uses an isolated transformer for ultra-quiet operation.

FEATURES
  • Power Amp
  • 500-watt Class G high-current solidstate power amp
  • 50-watt Horn Bi-Amp System
  • Toroidal transformer
  • Pre Amp
  • Six-stage all tube preamp (three 12AX7's)
  • Motorized pots allow 2 presets
  • Footswitchable two-channel motorized gain, master, and horn level controls
  • Tube driven four-band active EQ
  • Contour control with 500Hz-800Hz mid-frequency select
  • Deep and bright switch
  • Mute switch
  • 1/4" input jack with active/passive switch (-14dB)
  • Rear Panel
  • Effects loop & tuner output
  • Active DI with level control, pre/post, and ground switch
  • Two Horn Bi-Amp compatible Speakon outputs
  • Two 1/4" speaker outputs (fullrange only)

Bring your bass sound to the forefront with this exceptional bass amp from G-K. Order today.

SPECIFICATIONS

Fusion 550 Hybrid Valve Bass Amplifier

  • Dimensions:
    19"W x 5.25"H x 9.75"D
    Three rack spaces
    Weight: 24.5 lbs.
Reviews
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Review Snapshot

by PowerReviews
Gallien-KruegerFusion 550 Hybrid Valve Bass Amplifier
 
5.0

(based on 12 reviews)

Ratings Distribution

  • 5 Stars

     

    (12)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Excellent sound (6)
  • Good power output (6)
  • Portable (6)
  • Warm / comfy (6)
  • Easy to use (4)

Cons

No Cons

Best Uses

  • Performances (6)
  • Home studio (5)
  • Outdoor events / games (5)
  • Amateur recording (3)
  • Professional recording (3)
    • Reviewer Profile:
    • Experienced (4)

Reviewed by 12 customers

Displaying reviews 1-10

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5.0

Awesome!!!!!!!!!!!!!!!!

By Tuna27

from Connecticut

About Me Experienced

See all my reviews

Ask me a question

Pros

  • Easy To Use
  • Excellent Sound
  • Good Warmth
  • Portable
  • Powerful
  • Versatile

Cons

    Best Uses

    • Performances

    Comments about Gallien-Krueger Fusion 550 Hybrid Valve Bass Amplifier:

    After researching for years I finally picked up a 550. It is fully up to the hype. Maybe even better. I've been playing for over 40 years and this is amp #4 in my current stable (others: Ampeg SVP-Pro/Crown, GK MB115 combo, MusicMan tube head), but it is now #1 when I am going out the door. The spectrum of tone, and I mean powerful tone, is fantastic. Deep, crisp, fast, punch, smooth, it will do it all. Contrary to what some have said, it is very easy to dial in: just set the EQ flat, balance the gain and master to the volume and grit that you desire, rotate the contour to get you in the ballpark, test the two contour centers to see which "center' is preferred. and then tweak the EQ stack (GK is the BEST in this area) to get you that little bit closer to what's in your head, and then maybe readjust the gain/master if necessary. Real Easy. The range of tones is stunning. The response is extremely lively & fast. As crisp & clean as you like, and that thick, gooey, SVT caramel is there, too. This amp can substitute for nearly every great amp there is. The weight is of no consequence when compared to the truly heavy metal that populates the realm where this baby lives. In that sense it is quite light in the upper 20's (lbs.). The front end has incredible headroom and takes pedals well. This doesn't sound like a classic GK because of the beautiful tubes. The motor drives are flawless. I have used it with 2 bands steadily for a month and I am extremely pleased, as are ALL who hear it. If you like a lot of different amps and can't decide which one to live with, you've got to check the 550 out. Awesome!! I am currently running it into a GK Neo 212-II or an Aguilar GS stack (210, 115). Both sound AMAZING at any volume. I house it in a SKB 3-space Shallow Roto Rack and it is a perfect fit. Just about the best amp I ever experienced; a very happy owner. BTW: its got more grunt than my SVP-Pro/Crown rack that easily generates over 1.5KW. But that's a class D Crown power-amp...

     
    5.0

    Rock solid - loud - very loud - crazy loud

    By Forida Bass Dude

    from Nashville Tennessee

    About Me Experienced

    Pros

    • Excellent Sound
    • Fun to watch
    • Good Warmth
    • Portable
    • Powerful

    Cons

      Best Uses

      • Amateur Recording
      • Events
      • Home Studio
      • Performances

      Comments about Gallien-Krueger Fusion 550 Hybrid Valve Bass Amplifier:

      Had this about 3 months to go with my GK 500 Fusion. Both have similar construction, but this one (550) has so many rave reviews by pros I just had to get one. I've gigged with it live three times and each time several in the audience have commented on how great it sounds. Weight is actually 28 lbs. I pick it up by the handles on the front. I'm using one GK 212 Neo cab for 350 watts but still have to use a HPF to keep from blowing the speakers. Second volume pot goes just to the horn, so no distortion in the highs.This was rated when it first came out by an independent lab in Iowa as putting out almost 800 watts at 4 ohm with < 5% distortion. That my friend is a LOT of power from this one amp. And did I mention that it can get very loud!

       
      5.0

      This is an awsome amp.

      By Grillem

      from Terre Haute, IN

      About Me Professional Musician

      Verified Reviewer

      Pros

      • Easy To Use
      • Excellent Sound
      • Good Warmth
      • Portable
      • Powerful

      Cons

        Best Uses

        • Amateur Recording
        • Events
        • Home Studio
        • Performances
        • Professional Recording

        Comments about Gallien-Krueger Fusion 550 Hybrid Valve Bass Amplifier:

        Bought this amp as a backup for my Ampeg SVT Heritage Classic (made in USA). Blew 2 power tubes on the last gig. I love my SVT. However, this Fusion 550 is great. Played 2 gigs yesterday. About 8 hrs. worth. This amp is clean, fat, very warm for a transistor amp, and has power forever. Very Very close to an all tube sound. If you need power and good bass tone, this is the amp you want. Very good price for what you get. I played thru a GK amp in the 80's and liked it. This is my first GK. I have used peavy, fender, kustom, Ampeg (tube and transistor). This amp is really good. The tube pre-amp makes all the difference. Do not be afraid to buy this amp.....

        (2 of 2 customers found this review helpful)

         
        5.0

        The best

        By Tony

        from Long Island, NY

        About Me Professional Musician

        See all my reviews

        Pros

        • Excellent Sound
        • Good Warmth
        • Portable
        • Powerful

        Cons

          Best Uses

          • Events
          • Home Studio
          • Performances
          • Professional Recording

          Comments about Gallien-Krueger Fusion 550 Hybrid Valve Bass Amplifier:

          There wasn't a 10 star option so 5 will have to do. This amp can take whatever you throw at it, unrelentingly so. It's always at least 5 steps ahead of you but without drastically changing your tone. I've seen some subpar reviews out there and honestly I understand why BUT they are not really correct. If I had to choose one word to describe this head I'd choose "unforgiving" due to it's truly user driven potential. Basically what I mean is that if you can't do it, the amp won't do it for you. It reminds me of the old Genz Benz El Diablo guitar amps that got a bad rap due to bad players (lol), basically if you aren't a tone hunter you will not truly understand the capabilities of amps like this. If you're faint of heart go buy a regular solid state. Honestly I think even some tone hunters will be frustrated, so if you aren't a tonal warrior this amp may be too much. Greatest amp I've played, by far, and I've had the opportunity to play some incredible custom and mass produced amps. Really has a seemingly endless amount of tonal options, it's all in your fingers, equipment, and imagination! Like Mr. Gallien said himself, "we make tools not toys." Buy it, love it, create masterpieces with it

           
          5.0

          Won't find a better sounding head!

          By Bruce Killbane

          from toronto, on

          About Me Experienced

          Pros

          • Easy To Use
          • Excellent Sound
          • Good Warmth
          • Portable
          • Powerful

          Cons

            Best Uses

            • Events
            • Home Studio
            • Performances

            Comments about Gallien-Krueger Fusion 550 Hybrid Valve Bass Amplifier:

            I've used this for a few years now with band practice and live show settings.it has never let down.the sound you get out of it is incredible. Sound good with any bass. Amazing tone! Couldn't recommend more.

            (3 of 3 customers found this review helpful)

             
            5.0

            Lots of Tone and Lots of Power

            By MattyDB5

            from Raleigh, NC

            About Me Experienced

            See all my reviews

            Verified Buyer

            Pros

            • Easy To Use
            • Excellent Sound
            • Good Warmth
            • Portable
            • Powerful

            Cons

              Best Uses

              • Amateur Recording
              • Events
              • Home Studio
              • Performances
              • Professional Recording

              Comments about Gallien-Krueger Fusion 550 Hybrid Valve Bass Amplifier:

              I just switched to this amp because I got tired of carrying an 80 lb tube head in and out of venues. Not only is the tone better than the one I had, it has a lot of useful features like a tuner out and the ability to control your direct out level independently as well as run it pre/post equalizer. I'll probably always be playing GK from now on.

              (1 of 1 customers found this review helpful)

               
              5.0

              best tube head ever

              Comments about Gallien-Krueger Fusion 550 Hybrid Valve Bass Amplifier:

              value is great
              this is hands down the best sounding bass head i have ever played through the tone on this thing is amazing....it is a bit pricey but is well worth it.

              (7 of 7 customers found this review helpful)

               
              5.0

              60 seconds or less

              By Ken Butcher

              from Canada

              See all my reviews

              Comments about Gallien-Krueger Fusion 550 Hybrid Valve Bass Amplifier:

              My title is "60 seconds or less" because you'll fall in love it before the tubes have time to warm up. I've used/owned Fender, Ashdown, Ampeg, Hartkey and Peavy over the years, but they don't come close to the sound of this one. I'm in love with this amp and will not buy another one for as long as this one is functioning.
              This amp has all the features and more than you'll ever want! Unlike some other amps with they either have too much or to little GK actually puts a lot of useful feature on the front pannel. The four band eq and contours are perfect. I haven't used the motorized knobs yet because I just find it compliments my set up as is. Actually when I first tried it in the store, the store emplyee and I both jumped back as the knobs moved slightly. We kind of looked at each other and thought we were crazy!
              I've never owned a GK before so I'm not too sure about their quality, but I had several bass player friends recommend GK over other popular brands. So far I've had no problems!

              (4 of 4 customers found this review helpful)

               
              5.0

              best amp ive ever played

              By Anonymous

              from Undisclosed

              Comments about Gallien-Krueger Fusion 550 Hybrid Valve Bass Amplifier:

              i recently bought this as an upgrade to my gk 700rb head(which i also recommend)the 700rb is a great amp but ive been playing it through the gk neo 412 and it felt a bit underpowered so naturally id want to get something with a little kick. firsts things first this thing is built like a tank, and the motorized pots are amazing. they let me dial in a nice jazz tone then go right into a sic pop slap. and the over all tone control destroys any ampeg Ive ever touched. looking forward to taking it with me tour this year

              (5 of 5 customers found this review helpful)

               
              5.0

              Pure greatness

              By Adaire

              from MN

              Comments about Gallien-Krueger Fusion 550 Hybrid Valve Bass Amplifier:

              After playing with nothing but Fender forever I switched to SWR about 2 years ago. It was ok but never blew me away. I wanted something that had that great tube sound without the great tube head weight. This amp is it. I played on this amp for 5 minutes and was in love! I've gigged with it 10 times now and you'd be amazed at how many compliments I get. I play in a prog metal band and you can get anything from a nice growl to a jazz fusion tone. I plan on buying this exact head for my backup. 5 stars!

              Displaying reviews 1-10

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