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Ampeg SVT-4 PRO Series Bass Head  

Item #: 
1274115028071
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The Ampeg SVT-4 PRO Series Bass Head is a true hybrid that features a 3-tube preamp, a MOSFET power amp that delivers 1,200W @ 4 ohms (2x600W), tone-shaping tools, and all the pro features you'll ever... Click To Read More About This Product

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$1,54999.00
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Overview

The Ampeg SVT-4 PRO Series Bass Head is a true hybrid that features a 3-tube preamp, a MOSFET power amp that delivers 1,200W @ 4 ohms (2x600W), tone-shaping tools, and all the pro features you'll ever need. 3 tone controls, 5-position mid switch, 9-band graphic EQ, and ultralow/high boosts. Also features a defeatable optocoupler limiter, variable 0-7:1 compressor, internal 24dB/octave crossover, 50Hz-1kHz crossover point, high/low balance control, tuner out/mute function, 1/4" biamp outputs, 2 balanced line outs with transformers, 2 effects loops, and 2 preamp out/power amp ins. Classic SVT tone and contemporary reliability. 3U rackmount.

Features
  • 1200 watts @ 4 Ohms (2x600W)
  • 3 x 12AX7 preamp tubes
  • 3-band EQ
  • 9-band graphic EQ 5-position mid tone control
  • Ultra low and ultra high boost switches
  • 2 balanced line outputs 2 effects loops
  • 1/4" and Neutrik Speakon outputs
Specifications
  • Dimensions: 19 x 5.25 x 15.5 in.
    Weight: 42 lbs.
Warranty
MANUFACTURER'S WARRANTY
On May 1st, 2009, the Mackie, TAPCO, Crate, Blackheart and Ampeg websites will be updated with the addition of warranty URLs (e.g. www.mackie.com/warranty) expressing new A Stock warranty terms. These warranty URLs will go live on May 1st, 2009. Formerly, warranty periods for these LOUD brands appeared in a variety of locations – in product manuals (for Mackie and TAPCO) and on warranty cards and hang tags (for Crate, Blackheart and Ampeg). In order to streamline and clarify this process, Mackie, TAPCO, Crate, Blackheart and Ampeg warranty periods and terms will be communicated in full on the warranty pages. Any LOUD products purchased prior to May 1st will bear with them the manufacturer’s warranty as predates the new policy. Moving through this transition, in order for customers to obtain warranty service, both the sales receipt and a physical copy of the (older) warranty statement will be required by our Service and Support departments in order to issue Service Requests, etc. If the product was purchased on or after May 1st, 2009, but a physical copy of the older warranty terms is not presented, the new warranty terms and periods will apply. Meanwhile, the products that bear with them the new warranty periods (as reflected in the box contents of each product) are being tracked by serial #, and contain new warranty content referring customers to the appropriate brand website. The information below reflects the product warranty periods that will be effective on May 1st, 2009 for the Mackie, TAPCO, Crate, Blackheart and Ampeg brands: Mackie: A 3-year, nontransferable, inclusive warranty on electronics and a 2-year, nontransferable, inclusive warranty on drivers (where applicable) apply to loudspeakers (active and passive), power amps, powered mixers, and HR studio monitors. Specific models under this warranty include all SRM, HD, SA, C and S Series Speakers, all FRS Amplifiers, all HRmk2 Studio Monitors. A 1-year, all inclusive, nontransferable warranty applies to all mixers, MR Studio Monitors, Control Surfaces, Processors (digital), MR Studio Monitors, Control Surfaces, Audio/MIDI Interfaces, other SR & Recording Products. Specific product models under this warranty include all Onyx Compact, 4-bus and 8-bus, all VLZ3, all PPM, all ProFX, all CFXmk2 Mixers, all MR Studio Monitors, Big Knob, Onyx 800R, all MCU Pro family. Tapco: A 1-year, all inclusive, nontransferable warranty applies to all products and all models. Crate: A 1-year, nontransferable warranty applies to electronics and speakers on all models of MI amps, cabinets, and combos. 90-day warranty on all tubes Blackheart: A 1-year, nontransferable warranty applies to electronics and speakers on all models of MI amps, cabinets, and combos. 90-day warranty on tubes. Ampeg: A 5-year, nontransferable warranty on electronics and a 2-year, nontransferable warranty on speakers apply to all SVT Classic and Pro Series, MI amps and cabinets. A 2-year, nontransferable warranty on electronics and a 2-year, nontransferable warranty on speakers apply to all B Series, all Diamond Blue, and all BA combo amps. 90-day warranty on tubes.


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Pro Coverage gives you added warranty protection for your new gear. Stepping in where the manufacturer's "normal wear and tear" coverage ends, our Pro Coverage program offers you upgraded coverage if your product ever fails Read More.

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Review Snapshot

by PowerReviews
AmpegSVT-4 PRO Series Bass Head
 
4.6

(based on 102 reviews)

Ratings Distribution

  • 5 Stars

     

    (81)

  • 4 Stars

     

    (9)

  • 3 Stars

     

    (4)

  • 2 Stars

     

    (6)

  • 1 Stars

     

    (2)

80%

of respondents would recommend this to a friend.

Pros

  • Excellent sound (4)
  • Good power output (3)
  • Warm / comfy (3)

Cons

No Cons

Best Uses

  • Performances (4)
  • Outdoor events / games (3)
    • Reviewer Profile:
    • Experienced (4)

Most Liked Positive Review

 

Yep! This is It!

I recently "upgraded" from the SVT3Pro to the SVT4Pro and, after initial usuage, I am extremely pleased! Took it to practice (We play regularly 4-5 nights a week)...Read complete review

I recently "upgraded" from the SVT3Pro to the SVT4Pro and, after initial usuage, I am extremely pleased! Took it to practice (We play regularly 4-5 nights a week) I told both guitarist that if they continue to try to run me off the stage - I would make their ears bleed and gave them a demonstration. Problem solved. I agree with most other reviewers that it is IMPERATIVE that you choose a cab that can handle the amount of power the SVT4Pro puts out! I am currently using a SVT6X10HLF and it handles the power like a dream! I would suggest either the PR4X10, SVT6X10HLF, or the SVT8X10. Any of these will serve you fine. Unfortunately, I cannot give much of an "in-depth" review, (just got it), but, if it performs as well as it's "little Brother" the SVT3Pro, I will be a happy camper!

VS

Most Liked Negative Review

 

Great Sound, Terrible Quality

Go buy another head or find an old USA made ampeg. The old USA made amps do live up to their name. If you want better quality and better sound for a cheaper price...Read complete review

Go buy another head or find an old USA made ampeg. The old USA made amps do live up to their name. If you want better quality and better sound for a cheaper price go find a Demeter pre amp and a power amp that fits your needs.
This is one of my favorite sounding heads that I have ever used as far as pure sound goes. The problem is that ever since ampeg moved their factory to Vietnam, the quality has dropped. I have owned this head for about a year now and it has been in the shop about 5 times now for various reasons. I play about 200 gigs a year and cannot trust this head for any of them. The sound cuts in and out, there are mute switch problems as well as other problems. These heads are way too expensive to have this many problems. I have had multiple other friends that all got rid of theirs because of the same problems. A friend of mine is a manager at guitar center and does some ordering for them. He told me that ampeg sends them duds all the time and they have to send them back until they finally get an amp that works properly.
I've lost all respect for this company. They have poor support and terrible products. They know that their quality has gone way down but they charge more than they did before.
Mine has gone out countless times. I know others that have had the same problem and all gotten rid of them. If you want great sound from an amp that you can't ever count on, this is the amp for you.
If these amps could produce the sound that they do reliably, this would be a perfect score. But they don't.

Reviewed by 102 customers

Displaying reviews 1-10

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2.0

Ventilation problems

By Daniel

from Florida

About Me Experienced

Pros

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

Cons

    Best Uses

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

    Comments about Ampeg SVT-4 PRO Series Bass Head:

    Great Amp, except for ventilation problems, why would they put ventilation on the sides is beyond me, must have been a Friday afternoon decision around 4pm. If you buy this amp, invest in rack amp fans, and a hole saw, drill two holes in the side of your road case so they line up with the sides of the amp, two holes on each side of the road case. These amps get hot, if they get too hot, they turn off. You need killer ventilation for these amps, other then that, their awesome.

    (4 of 4 customers found this review helpful)

     
    4.0

    Amazing workhorse of an amp, w/ one glaring flaw

    By DanMac

    from Providence, RI

    About Me Professional Musician

    Pros

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

    Cons

    • Line-out Is Horrible

    Best Uses

    • Events
    • Home Studio
    • Performances
    • Professional Recording
    • Touring

    Comments about Ampeg SVT-4 PRO Series Bass Head:

    I have had my SVT-4 PRO for about three years now. It has gotten me through hundreds of shows, rehearsals, sessions and a national tour, playing every genre from blues rock/ Americana to shoegaze to punk. I play it with several different speaker configurations, depending on the situation (SVT 4x10, Kustom 2x15, Acoustic 8x10). No matter what bass I use or what pedals I run my bass through, the SVT-4 PRO never fails me with that distinct warm-yet-punchy Ampeg sound. This amp is an absolute workhorse. While I would love to have an SVT Classic, I don't feel like lugging around an 82 pound head, and I am not at the point in my career where I can count on stagehands to set up my rig for me. At half the weight, the 4 PRO can get you the legendary SVT Classic tone with a little bit of tweaking. For tone snobs like myself, the graphic EQ is a welcome addition to the amp, allowing you to be extremely selective when dialing in your tone.

    I would give this amp 5 stars, except for the one thing that everyone complains about: the balanced line out. It is terrible. I bought mine used and the line out was already having issues, which is probably why I got such a great deal on it. While most people blame it on the lackluster quality control of the newer Vietnam models, mine is one of the last St. Louis- made amps and it still has the same issues. PLEASE FIX THIS, AMPEG! It's truly the perfect bass amp, if it weren't for the line out! I have begrudgingly accepted it's flaw, and use a Darkglass MicroTubes B7K as a DI/SansAmp, and/or mic my cabs with an Audix D6.
    I don't think I could ever go back to using another bass amp, as the SVT-4 PRO has all the tone and power I could ever ask for, but I wish they had a reliable balanced line out! Also, do yourself a favor and put this in a rack mounted road case ASAP. You don't want to risk damaging such a great amplifier.

    (1 of 2 customers found this review helpful)

     
    5.0

    WICKED AMP

    By SPANKIES

    from ONTARIO

    About Me Professional Musician

    Pros

      Cons

        Best Uses

        • Events

        Comments about Ampeg SVT-4 PRO Series Bass Head:

        ALL I CAN SAY IS..EXCELLENT JOB AMPEG.WOW THE NICE TONE THIS PRODUCES IS TOTALLY AMAZING.I HAVE THE USA ONE.NOT SURE OF THE OTHERS.I RUN 2 FENDER 810 PRO CABS OFF THIS THING WHEN PLAYING OUTSIDE GIGS.THE GREAT COMMENTS I GET FROM PEOPLE IS STAGGERING.IT NEVER LET ME DOWN.IT CAN FILL EVEN A LARGE SIZE HALL WITH BEAUTIFUL BASS JUST USING 1 8X10.THE TUBE PREAMP SECTION IS THIS AMP SOUNDS WARM ANA BEAUTIFUL.IF YOU CAN EVER AFFORD ONE I CAN ONLY SAY,,,,,BUY IT..I TRIED IT HOOKED UP TO AN AMPEG 8X10 CAB WHICH SOUNDED REAL GOOD ALSO.BUT FOR ME THE FENDER CAB PUTS OUT A REAL NICE DEEP CLEAN BASS BOTTOM END AND SPARKLING HIGHS WITH THE SVT 4PRO.

        (2 of 2 customers found this review helpful)

         
        4.0

        Killer tone

        By Rockdoc

        from Portales, NM

        About Me Experienced

        Verified Buyer

        Pros

        • Excellent Sound
        • Good Warmth

        Cons

          Best Uses

          • Performances

          Comments about Ampeg SVT-4 PRO Series Bass Head:

          Purchased this to replace a beloved SWR SM400s. Absolutely killer tone, clean, punchy defined bottom end. More highs then I would probably ever use. Plenty of headroom. Lots of great biamping possibilities. Only problem was that my effects are all distorted running throught the effects loop and I hope that this is a defect in my unit and not a design flaw. Use the same setup on my SWR so I'm waiting on a replacement to arrive. Folks at Musician's Friend have been increadible in helping me out.

          (2 of 2 customers found this review helpful)

           
          4.0

          KIller Head

          By GBass

          from TWIN FALLS, ID

          About Me Experienced

          Pros

          • Excellent Sound
          • Powerful

          Cons

          • heavy

          Best Uses

          • Performances
          • Performing Live

          Comments about Ampeg SVT-4 PRO Series Bass Head:

          Before this head I have only played through all solidstate heads or combos. The tube preamp on this head kicks out warm tone untouchable by any solidstate preamp or modulator in my opinion. It also has an onboard compressor that is very useful. The bi-amp capability is great considering that I have 4/10 and 1/15 speaker enclosures. This beast has all the power I can ask for. The Ampeg SVT-4 PRO that I purchased is USA made so I am unsure about the quality of the Vietnam made amps.

          (4 of 6 customers found this review helpful)

           
          2.0

          Good Amp...When it works

          By Nate

          from Undisclosed

          About Me Experienced

          Comments about Ampeg SVT-4 PRO Series Bass Head:

          I love the tone. I can basically get any tone i want out of the amp. I love how loud and punchy it can get, I really come through with my loud drummer and awesome lead guitarist. But this amp has SERIOUS grounding issues. Some places i can take it and it's just fine. Other places I take it and i can't even play it without the amp cutting out. I've done everything I could possibly think of without replacing the amp itself. I bought it and power amp b was already dead. Not too thrilled with this amp.. per the title, it's great!...when it works right.

          (4 of 5 customers found this review helpful)

           
          5.0

          SVT4

          By Turin Turumbar

          from Los Angeles

          Comments about Ampeg SVT-4 PRO Series Bass Head:

          OK, first of all, this head is a mindless monster. You have to know what your doing in order to get your Tone! The Bi-Amping capabities are fantastic. But you have to make sure your doing everyting right. This thing goes down to 900 watts per channel x 2 at 2 OHMS! But if you bridge it below 4 ohms you'll blow it up. This thing will blow the paper off the speakers of a 8x10 if you let it.
          You can get the tone of a all tube SVT or any of the big power house heads of our day- Eden, GK, Fender, SWR.....But this head has a Darkside. It has Endless POWER. If your in a garage band, move along to something else.... but if your in a big time situation, this head is the end. The Answer to all things Bass. Mine is a Vietnam made. I have run it a full bore and it has not failed me yet.
          I can see how if you dont hook up the speakers the right way it will blow up. You have to make sure your Ohms to wattage is correct. You have to make sure your buttons are set right or you'll lose tone. All in all, i havent heard a better sounding amp, or id buy it.

          (1 of 2 customers found this review helpful)

           
          5.0

          Love it!

          By ENZO CAMPAGNOLO

          from Michigan

          Comments about Ampeg SVT-4 PRO Series Bass Head:

          Great Amp! This is the tone I've been looking for. Very smooth sounding, never harsh in the high end and has the low-end rump that really cuts though. I've played/owned many bass amps / preamps including the Ampeg SVT-3 Pro, 1974 Ampeg SVT all-tube head, Ampeg SVT Classic head, 1968 Ampeg B15N, Ampeg BA-115 Combo Amp, GK 700RB, Tech 21 RBI Preamp, BBE B-Max Preamp, SWR Grand Prix Preamp, Hartke Kickback Combo Amp and probably many more that I cant even remember. I play passive and active fender jazz basses. This amp makes them all sound good. I'm using a Markbass New York 151 Cab along with an Ampeg 115 Cab. This ones a keeper!

          (5 of 13 customers found this review helpful)

           
          1.0

          great amp!

          By Keith Logan

          from Undisclosed

          Comments about Ampeg SVT-4 PRO Series Bass Head:

          Where do i start??? If anybody has a proplem with this amp is probobly becaue your not hooking it up correcty. Gotta make sure you have the buttons all pushed in right. This is a complicated amp!! Make sure all your cabinets hook up right to wattage to oms. you dig?? This Amp rocks man. More power than you can ever need. TONE! The 3 12zxy's give you way more tone than you can imagine. The only complaint is you cant ovedrive this monster, but thats ok, just get a ovedrive unit.
          I have a usa made and a veitnam made and they both rock. no difference. i use to own the all tube heads.... im 50 years old... cant handle the weight! if the SVT is a 10 then the SVT-4 is a 9.5.

          (6 of 8 customers found this review helpful)

           
          3.0

          svt-4pro head

          By Rick Ramsden

          from Detroit, Mi

          Comments about Ampeg SVT-4 PRO Series Bass Head:

          If it wasn't for that monster ampeg sound I'd give it a 0 accross the board
          This head definately can get any tone you want, and all the power you will need to push it. BUT it is the most unreliable head I've owned, and I'm a true Ampeg fan. I've had several different ampeg set ups and other brands as well. But there is something that just stands out with tone of a ampeg. I bought this head 3 years ago, at first for writing and rehearsing it was awesome. Then came the first live gig and was told by a soundman that I trust that there was noise in the Balanced line out. There is no ground lift on this head. So we took it back home and played around with different hook ups, still had noise. I got a new out of the box head and had the same problem. So I bought a direct box with ground lift, recorded, did several shows and the balanced lines quit working period. This is way TOO much money to spend on bad design, this the only model ampeg I've ever had problems with Im totally disapointed the unreliability factor!
          Too much money for repeated problems, even when they gave me another head
          No value to working musicians to go through repeated problems

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