Harley Benton GPA-400

218

19 "Guitar Power Amplifier

  • Lightweight Class-D technology with switch-mode power supply
  • 2x 200 W @ 4 Ohm
  • 2x 100 W @ 8 Ohm
  • 2x 50 W @ 16 Ohm
  • Bridged 400 W @ 8 Ohm and 200 W @ 16 Ohm
  • Frequency range: 20 Hz - 20 kHz
  • Input sensitivity: 335 mV
  • Damping factor: > 80
  • Signal- noise ratio: > 90 dB
  • Total harmonic distortion (thd): < 0.15%
  • Power consumption: 18 W (standby current)
  • Dimensions (W x D x H): 482 x 250 x 44 mm
  • Format: 19"/ 1 HE
  • Weight: 3 kg
Available since September 2014
Item number 319961
Sales Unit 1 piece(s)
B-Stock from 2.250 kr available
2.399 kr
Including VAT; Excluding kr200 shipping
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Lightweight 19" stereo guitar power amp

Gone are the days of lugging around heavy guitar power amplifiers - and we can be thankful for it. Modern Class D power amps pack an enormous amount of power into a lightweight package - and the Harley Benton GPA-400 stereo guitar power amp is no exception. With dual outputs each delivering 200 watts of power at four ohms, this powerhouse comes in a 19"/1 HU rack format and is the ideal solution for guitarists and bassists who are looking to make their rig powerful enough to always be heard, but want to save their energy for the stage rather than wasting it transporting their gear. Each channel features independent controls for resonance and presence as well as dedicated indicator LEDs for signal and peak, so a full parameter overview is ensured at all times. What is more, the GPA-400's robust 19" chassis weighs in at a mere 3 kg, so it can be easily transported without putting your back out.

Plenty of power for your rack

With an output of 400 watts in mono bridge mode and 200 watts in stereo mode and covering a frequency range of 20 Hz to 20 kHz, the GPA-400 is a real workhorse, and it provides the perfect solution for powering either a single cab on its own or two cabs in a stereo setup. Each channel has a dedicated two-band EQ with a resonance control for bass and a presence control for treble, which lets you make final tweaks to the signal coming from your preamp, pedal board, or multi-effects unit and get the sound you want from the speakers connected. Both channels also have their own indicator LEDs for peak and signal to allow you to visually monitor the incoming signal, and the front panel feature a mute switch to allow complete silence when you are not playing. The GPA-400 also operates without mechanical noise, as there is no internal fan to start getting on your nerves.

THE power amp for stereo rig users on a tight budget

Players who use guitar rigs like the Kemper modelling amp series or Axe FX Fractal systems will find the GPA-400 to be a very interesting alternative to significantly more costly units. This robustly built power amp - manufactured in the time-tested 19" rack format - delivers up to 400 watts at four ohms in mono and 200 watts in stereo, and should thus fulfil a wide range of applications. A glance at the GPA-400's budget-friendly price tag (typical of Harley Benton) of course makes it twice as attractive. All of this means that the GPA-400 is particularly interesting for musicians who are on a limited budget but don't want to miss out on the luxury of amplifying their system in stereo.

About Harley Benton

Since 1998, the Harley Benton brand has been catering for the needs of numerous guitarists and bassists. In addition to an extensive range of stringed instruments, Thomann's house brand also offers a wide choice of amplifiers, speakers, effect pedals, and other accessories. In total, the range includes over 1,500 products. Built by established names in the industry, all Harley Benton products combine quality and reliability at attractive and affordable prices. The continuous expansion of the range ensures that Harley Benton always provides new, exciting, and innovative products that keep players perfectly in tune with the musical world, day after day.

High performance for rehearsal room and stage

Whether you are using the GPA-400 with a 1x12" cabinet for practising and jamming at home or pairing it with a pair of 4x12" cabs on stage, this little powerhouse is easily up to both of those jobs. In addition to amplifying your guitar preamp, the GPA-400 also gives you additional scope to shape your sound to suit the room and the speakers connected thanks to its two-band EQ. The fact that the GPA-400 weighs in at just 3 kg and operates without a fan in order to facilitate quiet practice at home is also an advantage that is not to be sneezed at. It has never been easier to have so much power at your disposal wherever and whenever you need it while going easy on your wallet - and your back - at the same time.

218 Customer ratings

4.7 / 5

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150 Reviews

A
Great Power Amp If You Have a Good Front End :)
Angelus502 30.06.2015
I was a bit hesitant about buying this, Class D, very inexpensive :S But Im glad I did...

Where to start.. Class D amps.. So amp's come in basically 3 types, Tube, Solid State, and Class D. Tube amps have that nice warm tone and gorgeous sounding harmonic distortion, breakup and compression, plus there loud for the watts, but unfortunately cost a fortune. Solid State amps tend to just have raw power and balls once you get up there in the watts, but sound a bit sterile compared to tubes. Class D or digital amps always sound incredibly detailed but cold and sterile to my ears, they tend to put out what you put in without warming anything up or rounding off the bad edges. Also 200 Watts Class D is volume wise about the same as a 30-50 watt tube amp. But as this was for a second guitar rig using some preamps, a G Major FX and a Harley Benton 2x12 Vintage Cab I already owned I didn't want to be shelling out $600-$1000+ on a tube amp, well not at the moment.

Initially I had some problems dialing in a good tone, I think the amp probably needed some run in time to take out a little new amp harshness, and while it didnt sound like a cheap $200 combo when I had a solid state preamp hooked up it, it wasn't doing it for me it tone wise. Solid State preamp and Class D power amp, probably not a good way to go :(

Next up I hooked up a 20 year old Digitech tube preamp, with a bit of EQ tweaking and a OCD clone as a boost I was happily rocking out thinking this sounds pretty good.

Then 2 days ago the AMT SS-10 I ordered turned up. OMG, chimey cleans, gorgeous slight blues breakup, and the crunch / high gain have a great tube compression, and it sounds almost as if there's some power tube breakup and sag going on in the tone. I was in guitar nirvana gurning away like an idiot. After I finished playing Van Halen's "Panama" solo I thought "damn my playing doesn't usually sound that good".

So there you go.. Class D... **** in = **** out, great tone in will equal great tone out. Very transparent and it's not going to hide or warm anything up.

A couple of other things...

* I did A/B it against a blackstar HT5 power stage a few weeks back and the HT5 sounded flat and muddy in comparison.
* It's not hugely loud. I dont know if it would run stereo 4x12 cabs at gig volume, but in bridged mode it should be fine for a single 4x12.
* What's with the dodgy cheap knobs Thomann? It feels like they are glued on too :(
* The tone pot values are a bit too sensitive as well, 10 to 2 o'clock is about all that's usable.
* If you're thinking about getting one of these.. I did try running the 2x12 cab in stereo , but I was getting some weird phase cancellation, probably due to stereo FX.
* Very light.
* Runs cold.
* If you have a high end ( or new model ) modeler this would probably work very well to, unfortunately I don't have any good modeling gear anymore to test with.

I was planing on replacing this with a 20 Watt tube amp when I had the cash, but if my feelings about the ATM don't change, and I don't end up putting the AMT in my main rig, I don't think I'll bother... Great inexpensive power amp if you have a good front end \m/
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ZigM 20.12.2020
This guitar power amp deserves 5 stars if I were to evaluate the amp on its own. However, to my shock and awe, when I opened the box, there was a second hand, B-stock or reconditioned unit inside. How do I know? The unit was not wrapped in plastic, the on/off switch was still on and I could see fingerprints, dust and even a few scratched on the top of the unit.

I plugged it in never the less to see whether it was operational before contacting Thomann. I'm pragmatic when it comes to ordering goods from the other side of the planet. Thomann offered a discount which I accepted, including a 3-year-warranty. But it was disappointing that Thomann's warehouse didn't appropriately mark this amp for what it was: used.

Had the power amp sounded crap, I may have actually sent it back but this amp sounds amazing with my Hotone Ampero which I run through a Behringer Ultragain Pro, into this power amp and then into original 1970's greenbacks in stereo.

Before the GPA-400, I ran my Ampero through an LD Systems XS200. It sounded harsh, fizzy and sterile. When running through the power amp stage of my Laney IRT60-H, it sounded better but still fizzy. The GPA-400 hits the mark. It sounds great, whether because it's broken, bad quality or intended by design, it takes the fizzy and harsh trebles away. The presence controls are perfectly calibrated to take even more fizziness out of the signal and the resonance controls are also useful in dialing out flabby sub tones (or dialing them in if you're into djenting). A standard transistor power amp can't do that. This one can.

Overall, it makes my Ampero sound as if it's going through a $1,500 valve power amp. Gutsy, percussive yet soft. A bonus is that it's well built and light. Very light. Not sure whether that's because of a light weight transformer or not. The on/off switch is fine and I'm not fussed about the plastic knobs of the pots. The pots, by the way, are perfectly OK.
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b
Simple amp, easy to use and very loud!
bazbishop 26.11.2019
The GPA-400 has everything you need from a power amp, especially if you carry it around a lot. At only 3kg, it is so light that it makes travelling to gigs super easy.
There are two channels, each with two speaker connections (jack plugs), so simple and straight forward. The resonance and presence are effectively tone controls, similar to bass and upper mid - I know electronics experts will cringe about this description, but that's pretty much how they work. They can be quite handy for balancing up the tone of slightly different speaker boxes.
There is a push-button mute switch on the front, signal indicators and red clipping LEDs. I never got these to light up, because it is so devastatingly loud, I was frankly too scared.
The sound is clean, really really clean and the high frequencies can be a little bit shrill, but this can be mostly accommodated by EQ in the pre-amp.

So to summarise, a cheap, sturdily built, very light, tremendously loud power amp. It will not sound like an over-driven valve power stage (which will weigh ten times as much), but it will accurately reproduce anything your amp modelling effects unit delivers to it.
For the price, this is an excellent buy.
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F
Amazing amp for the price
Fubnuts 08.01.2019
I bought this amp to fit in my rack with my Line6 Helix and its just perfect. It weighs hardly anything, runs cool and is plenty loud enough for a thrash metal band! I use it live though my Marshall 4x12 and its great.

Ok the controls on the front are a bit naff, they feel and look a bit cheap but I guess you can always replace them.

I did attempt to replace this with a Seymour Duncan powerstage 700 - sent it back, bought another GPA400 :)
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