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Open Box Ampeg SVT-4 PRO Series Bass Head  

Item #: 
481710004000000
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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... Read More

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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

GUITAR CENTER'S PRO COVERAGE
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.

Pro Coverage includes
  • Accidental damage protection (new gear only)
  • Expedited repair
  • Free shipping (for returns or repairs)
  • 100% coverage for commercial use
  • Extended return period
  • Extended price protection
  • No lemon guarantee
  • Free transfer of coverage to a new owner
  • Repair costs covered for up to three years from date of purchase
  • Repair authorization-toll-free by phone or via the web
  • Customer Reviews
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Review Snapshot

by PowerReviews
AmpegSVT-4 PRO Series Bass Head
 
4.5

(based on 14 reviews)

Ratings Distribution

  • 5 Stars

     

    (11)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (2)

  • 1 Stars

     

    (0)

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

 

Ventilation problems

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...Read complete review

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.

Reviewed by 14 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.

    Comment on this reviewHelp Icon

    (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!

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    (1 of 1 customers found this review helpful)

     
    5.0

    Excellent Tone!

    By Timj

    from grand rapids, Mi

    Comments about Ampeg SVT-4 PRO Series Bass Head:

    30+ years of playing bass, Punk/Metal/Hardcore. I finally decided to replace my old heavy Ampeg SVT full tube head and 8x10 cab,with something lighter and has the balls and tone of my old classic SVT rig,, loving the Ampeg tone I started my research,I first tried the lightweight SVT-7 PRO, and was disappointed!! EZ to carry yes! but that Ampeg tone just was'nt there,,was beginning to wonder if I did the right thing by selling my old rig,,so I returned the 7-Pro..and bought the SVT-4 PRO and 2 of the Ampeg PRO NEO 4x10 cabs. got my new rig home and was very pleased!! This rig has the balls and tone I wanted, plus way easier to move and load into my van. The 4-pro is so versatile,,plenty of ways to hook up speakers,and all the tone adjustments needed,,I decided to run the 4-pro in bridge mode getting the full 1200 easily into the PRO NEO cabs,,KILLER TONE! ONLY ISSUE! this head gets hot! REAL HOT! I tried 3 different rack cases and returned all!,,none would allow this head to vent! "over heat and the head shuts down!" cooling input and output vents on the sides make this difficult to put into rack cases allowing proper air flow.

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    (1 of 1 customers found this review helpful)

     
    5.0

    oh my %$#$^*^ &^*!!!!!!

    By Hayden

    from Gansevoort, NY

    Comments about Ampeg SVT-4 PRO Series Bass Head:

    Yep, I have been a bass player for over 20 years .I have been playing another brand my whole life until this one. It is a little pricey for the average consumer but, if you like the cuffs of your pants to vibrate around your shoes you will dig this head. I am playing it through 6x10's and sometimes 4x10 and a 15 currently. My Bass has an 18volt pre-amp.I used to use a comp/limiter and a really high end pre-amp with my old system. Now I really don't need to.With the right bass I can go from a nice fusion jazz, to pop rock, to grunge, then all out funkin it up, and maybe get as close to Geddys sound as possible with a few flicks of a switch. It has other capabilities as well. Take a look at the bi-amp. what really attracted me was the analog knobs and graphic eq. AND a parametric, along with that unmistakable, intense solid state sound. I will buy another if I ever have to.

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    (6 of 6 customers found this review helpful)

     
    4.0

    Great sounding head, reliability?

    By Sybariticmetal

    from Atlanta, GA

    Comments about Ampeg SVT-4 PRO Series Bass Head:

    Have had mine for 6 yrs now and I still love it. It has so many useful options as to how to connect your cabs but typically I just mono bridge to a 2x15 Bergantino setup. There's plenty of headroom with the 4pro and The EQ is great. I can always dial in a similar tone no matter which bass I'm using or what room I'm playing in. The direct out is quiet, useful, and has worked well for all the venues it's been used in. Two design shortcomings I've found with the 4 pro are that it has no ground lift switch and that the fan vents on the side and not the rear. Why in the world would you have them vent to the side? That being said, I haven't ever had an overheating issue in a standard SKB case. As far as reliability, I'm still on the fence. The preamp board on mine died after 1.5 yrs but it was repaired under warranty at no charge to me. Luckily there was a warranty repair center 4 miles from where I work. Would be much more of a pain if you're not in a major city I imagine. My teacher's 4 Pro also had the same preamp blowout issue at 2 yrs or so and his was also repaired under warranty. I am now having issues with the amp muting randomly. I believe the foot switch mute jack is to blame and will be getting it re-soldered or replaced. My teacher ended up selling his but even with the few issues I've had mine's been reasonably reliable based on number of gigs and playing hours its been used. I probably won't ever sell it.

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    (2 of 2 customers found this review helpful)

     
    5.0

    this is amazing

    By Rudy Garcia

    from Canyon Country California

    Comments about Ampeg SVT-4 PRO Series Bass Head:

    I have had this amp for about a month. I was never able to get that power slinky sound out of my amps until i was introduced to this amp! it is the best investment i have ever made i can go from playing punkska to jazzy stuff. you always get that sound you are always looing for. i use it out of a 6x10 bass cab and i think i have to get a 8x10 just to luse its power. i honestly gareentee it for anyone who cant find that PERFECT SOUND THEY ARE LOOKING FOR!!!!!

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    (10 of 11 customers found this review helpful)

     
    5.0

    You need to buy this thing!!!!

    By Michael

    from SC

    Comments about Ampeg SVT-4 PRO Series Bass Head:

    I've played through a lot of bass amps but, Ampeg beats them all. The Ampeg SVT-4PRO is the way to go for any type of music. I can punch in any type of tone from a nice punchy slap tone to a rich SVT-CL tone. I'm financing on this guy within the next couple of months with an Ampeg SVT-810e. Great setup!!!! I was debating between this dude and the classic and four things won me over. 1. It's 1200watts RMS compared to 300watts RMS 2. Built in EQ, Compressor, Limiter, and Cab bypass options 3. When the tubes blow, instead of paying for 11 tubes at $15-20 a piece, I only have to buy 3 and 4. The Classic is like 80 lbs while the 4PRO is something like 38 lbs. I'm sure that people can argue about the classic being all tube, warmer, and 300 tube watts not solid state watts, but the sound out of the 4PRO is monsterous. It's all about tonal opinion when it comes down to it I guess; however, for me, I'm stickin with the Ampeg SVT-4PRO!!!!

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    (12 of 12 customers found this review helpful)

     
    5.0

    Crank It Up

    By rbonner

    from SIoux Falls, SD

    Comments about Ampeg SVT-4 PRO Series Bass Head:

    I currently own four of these amplifiers and power 4 SVT-810E cabs. Soon to be adding additional cabs and AMPS to my rig. This amp is a great device and does everything I ask of it, but I will warn you it vents the hot air out the side of the case. In the manual AMPEG suggests 3" to the side, this is not practical. When I bought my first head I installed it in a SMB Roto case, great case but not for a 4PRO. The case only had about 3/8" clearance at the vents. The side warped right into the outlet vents and blocked them within a couple minutes of playing. I heard the fan go to high. Guys who have a problem with these amps rack them too tightly. A big wood ATA rack will need additional fan cooling. Now my 20U rack has 1" clearance and I have dual rack mount fans blowing air into the bottom of the rack and vent it with another dual fan setup at the top. I do not have issues. Should AMPEG have designed it differently? Well thats not my call, but just know its a fantastic box if you take these cooling steps to heart. BOB

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    (4 of 4 customers found this review helpful)

     
    5.0

    12AX7 and MOSFET power/ Best of both worlds.

    By HIGHOKTANE "Progressive Metal"

    from New York

    Comments about Ampeg SVT-4 PRO Series Bass Head:

    Best of both worlds. Three 12AX7 tubes in your pre-amp section provide the legendary SVT classic growl. A MOSFET Power amp gives you 1200 watts rms continuous and 1600 watts peak. EQ lets you dial in whatever tone you want. Pre-sets come in handy from classic growl to modern tones. This is a very powerful, versitile amp that deserves to be plugged into a powerful speaker cab to reap the benefits of all its capabilities. This amp will last a lifetime, but you need to protect your investment. Get an SKB or similiar flight or rack case to protect the amp. You don't want this amp banging around in the back of your pick-up truck. It will require a 3 space or larger rack case. A larger case will provide better ventilation and keep your amp cool. Tube amps are susceptible to damage from moisture or extreme changes in temperature, going from hot to cold and vise versa. If it overheats, give it more air, a small fan works good. I gig all the time and this amp has not let me down. It has never overheated, and mine is inside a 6 space rack case (no external fan). I've taken this amp to the limit and it has never let me down. I've played around with every setting, wiring scenario, and just when I thought this amp was mega loud, I decided to disengage the limiter and tested it to the extreme limit. It performed like a champ and a fighter jet would seem quite next to this amp with the limiter off. Not recommended to turn off limiter, but I had to see for myself. 136+ decibles is nothing for this amp to achieve. Read the wiring diagram carefully. If you wire it wrong, ie. reversing pin 1+= "+", pin 2+= "-" polarity, or using the wrong speaker cab, etc., it may produce some unwanted problems and diminished sound quality. Easiest set-up is to mono-bridge this amp into an 800+ watt 8x10 speaker cab like the SVT 8x10, or two 4x10 in stereo mode using SPEAKON connectors. My amp came with a 3 foot SPEAKON connector wire that had a SPEAKON on one end and a 1/4 inch connector on the other end. The 10:1 built-in compressor is a mild compression. I recommend a dbx 160 rack or a digitech squeezer foot pedal for more comp. The pre-amp only has three tubes, the rest is solid state. For more growl I recommend the digitech distortion pedal. Enjoy your new amp and go knock down some walls.

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    (25 of 28 customers found this review helpful)

     
    5.0

    Yep! This is It!

    By Zippy

    from MidWest

    Comments about Ampeg SVT-4 PRO Series Bass Head:

    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!

    Comment on this reviewHelp Icon

    Displaying reviews 1-10

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