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Gallien-Krueger Fusion 800S 800-watt Ultra Light Bass Head Certified Open Box , $1,214.10 - Add to Cart Skip to Product Information

Gallien-Krueger Fusion 800S 800-watt Ultra Light Bass Head Certified Open Box

800W Ultra-light Bass Head with Class D Power Amp and Tube Preamp, 4-Band Active EQ, and Switchable Tube Overdrive
Item ID: FusionS800d2
Gallien-Krueger Fusion 800S 800-watt Ultra Light Bass Head

Certified Open Box Savings!

Save $84.90 What is Certified Open Box?

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Savings: $84.90 New for $1,299.00
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Gallien-Krueger Fusion 800S 800-watt Ultra Light Bass Head Certified Open Box

Certified Open Box Savings!

Save $84.90 What is Certified Open Box?

The price below reflects your savings.

Savings: $84.90 New for $1,299.00

Ultra-light, Tube-powered Bass Amp Head with Monster Tone

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The Gallien-Kreuger Fusion 800S is an 800-watt compact, ultra-light bass amp head with a Class D power amp and an all-tube preamp with tube-powered overdrive. Vintage-voiced with modern punch and clarity, the Fusion 800S, can roll with any genre, churning out crisp and articulate clean tones, big-bottom low end, and gritty distortion that'll knock the house down. With its small form factor, ultra-light construction, and robust interconnection system, it's built for the touring bassist. Additionally, a fully stacked feature set, including illuminated knobs, effects loop, and balanced DI, makes the Fusion 800S one of the most versatile heads of its size bassists at Sweetwater have ever seen.

Vintage-voice with a modern punch

The Fusion S series pairs GK's signature punchy power section with a characterful tube preamp for a warm, vintage-style sound with modern punch and heft. The preamp is packed with three 12AX7s, with one dedicated to the overdrive channel, for the kind of growling distortion you can only get from overloading a tube. Sculpt your tone to fit any genre with GK's classic 4-band active EQ and push-button voicing filters, including "Bump," "Contour," and "Presence," for on-the-fly adjustments. Onstage or in the studio, the Fusion 800S is a tonal chameleon perfect for any performance style.

Built to take a beating

Chucked in vans, tossed in trunks, and dragged from show to show, bass amp heads take a lot of abuse, and, over time, the electronics can start to suffer. This means your tone starts to suffer, too, and that is simply not acceptable! The Fusion 800S is fortified to handle even the heaviest use. Boasting the same robust interconnection system found in GK's Legacy series bass amp heads, Fusion S series heads employ gold connectors on their circuit boards, which deliver a more reliable and purer tone than the standard tin connectors found in other heads.

Jammed with features bassists love

GK loaded up the Fusion 800S with a host of features designed with working bassists in mind. Illuminated knobs to adjust your tone on dimly lit stages without squinting into the dark. Mono 1/4-inch Send/Return for patching in your favorite external effects units. Impedance selector to ensure your 2, 2.7, 4, or 8-ohm cabinet receives the optimal load. Balanced DI output with pre- and post EQ for patching into a live-sound board or recording console. And it's all housed in a rugged metal enclosure to withstand those aforementioned vans and trunks!

Gallien-Krueger Fusion 800S Features:

  • 800W compact, ultra-light bass amp head
  • Class D power amp
  • Analog tube preamp
  • GK's classic 4-band active EQ
  • Footswitchable tube overdrive
  • Bump, contour, and presence voicing
  • Balanced XLR output with pre and post EQ
  • Unbalanced 1/4-inch FX loop send and return
  • Illuminated control knobs
  • Aux input and headphones output
  • 2-, 2.7-, 4-, and 8-ohm load capacity
What is Certified Open Box Gear?

At Sweetwater, we're so picky that what we call "Certified Open Box" is actually better than what most music retailers sell as "new" gear! Our gear hasn't endured hundreds of people a week plunking away at all the keyboards, fumbling through Stairway to Heaven on every guitar or playing with every fader and knob on a mixer or control surface.

Certified Open Box (also known as a demo) means we’ve had it out of the box for our YouTube channel, displayed at events, tested in our studio, or maybe it was in a customer’s hands for a few days and isn’t ‘factory fresh’ as a result. Every Certified Open Box item we sell has Sweetwater’s 2-year Total Confidence Coverage™ warranty and has been tested and verified up to ‘new’ specs by our factory-authorized technicians to make sure it’s in perfect working order before we ship it to you.

When you buy a Certified Open Box item at Sweetwater, you get:
  • 2-year Total Confidence Coverage Warranty™!
  • Products inspected and tested by our factory-authorized techs, guaranteed to function like new (or better)!
  • FREE shipping on most items
  • Equipment that will MEET or EXCEED your expectations!

Click HERE to browse our current inventory of Certified Open Box equipment. Purchasing Certified Open Box gear from Sweetwater is a smart and safe way to save!

Warranty Info

Sweetwater's FREE 2-Year Total Confidence Coverage Warranty

Extra peace of mind at no extra cost.

  • Save money with FREE parts and labor
  • Get back to making music with the industry's fastest turnaround time
  • Fix it the first time with our award-winning, factory-certified Service Department
Learn More about Total Confidence Coverage

Offer applies only to single-receipt qualifying purchases. Select manufacturers may require that only the manufacturer’s products qualify towards the minimum purchase amount needed to be eligible for promotional financing. Otherwise, an invoice that meets the minimum purchase amount and contains at least one qualifying manufacturer product is eligible for promotional financing. No interest will be charged on promo purchase balance, and equal monthly payments are required on promo purchase until it is paid in full. The payments equal the amount financed divided by the number of months in the promo period, rounded up to the next whole dollar. These payments may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months’ rounding. Regular account terms apply to non-promo purchases. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

Offer applies only to single-receipt qualifying purchases. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

The estimated required monthly payment shown which excludes taxes and delivery equals the amount financed divided by the number of months in the promo period, rounded up to the next cent. During the last month(s) of the promo period the required monthly payment may be reduced due to this rounding. These payments apply only with the financing offer shown. If you make these payments by the due date each month, you should pay off this amount financed within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.

Applies only to select items from this manufacturer. Ask your Sweetwater Sales Engineer for more details.