Harley Benton GPA-400

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$185.00 Price Tier: Budget

4.5 (7)

Find out who is using Harley Benton GPA-400

2 community setups

1 wishlisted

11 saved

Page last updated Jul 01, 2026

Pricing and availability

We compare 600+ stores and found this item at 1 store. Prices updated January 7, 2026.

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4.7 (257)

$185.00

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Average Price: $185

Budget/Beginner

$299

$1500+

Price Tier

In the Power Amplifiers category, Harley Benton GPA-400 is priced in the Budget/Beginner range. This is great gear to get started with or for creators on a budget.

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Price History

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Description

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Elevate your live sound experience with the Harley Benton GPA-400, a powerhouse amplifier designed for musicians who demand exceptional performance without compromise. This lightweight Class-D amplifier is engineered with cutting-edge switch-mode power supply technology, ensuring consistent and efficient performance whether you're on stage or in the studio.

The GPA-400 offers versatile power options, delivering 2x 200 W at 4 Ohm, 2x 100 W at 8 Ohm, and 2x 50 W at 16 Ohm. For those moments when you need an extra punch, switch to bridged mode for a formidable 400 W at 8 Ohm and 200 W at 16 Ohm. With a frequency range from 20 Hz to 20 kHz, your sound will be vibrant and full-bodied, capturing every nuance from the deepest bass to the crispest highs.

Featuring an input sensitivity of 335 mV and a damping factor greater than 80, the GPA-400 ensures your audio signal is clear and precise. The signal-to-noise ratio exceeds 90 dB, providing a clean sound free of unwanted distortion, with a total harmonic distortion of less than 0.15%. It's compact yet durable, fitting perfectly into a standard 19" rack format, making it an ideal choice for traveling musicians and sound engineers.

Key Features:

Lightweight Class-D technology with switch-mode power supply
Power output: 2x 200 W @ 4 Ohm, 2x 100 W @ 8 Ohm, 2x 50 W @ 16 Ohm
Bridged mode: 400 W @ 8 Ohm, 200 W @ 16 Ohm
Frequency range: 20 Hz - 20 kHz
Input sensitivity: 335 mV
Damping factor: > 80
Signal-to-noise ratio: > 90 dB
Total harmonic distortion (THD): < 0.15%
Compact 19" rack format

Owner's manual

Harley Benton GPA-400 User Manual

Product specs

Available since

September 2014

FAQs

What is the power output of the Harley Benton GPA-400 amplifier?: The Harley Benton GPA-400 amplifier delivers a power output of 200 watts per channel at 4 ohms, making it suitable for small to medium-sized live sound applications.
Does the Harley Benton GPA-400 have protection features?: Yes, the Harley Benton GPA-400 includes protection features such as short circuit, overload, and thermal protection to ensure safe and reliable operation during performances.
What type of inputs does the Harley Benton GPA-400 support?: The Harley Benton GPA-400 supports both XLR and 1/4" TRS inputs, providing flexibility for connecting a variety of audio sources.
Is the Harley Benton GPA-400 suitable for portable use?: Yes, the Harley Benton GPA-400 is designed to be lightweight and compact, making it a practical choice for portable sound reinforcement setups.
Can the Harley Benton GPA-400 be used in a stereo setup?: Yes, the Harley Benton GPA-400 can be used in stereo mode, allowing for enhanced audio performance in live sound environments.

Videos

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Alex5000

Unboxing Harley Benton GPA-400 and my new rack case of doom

Alex5000

Is A Harley Benton Power Amp Worth It ? - HARLEY BENTON GPA-400 GUITAR POWER AMPLIFIER Mini Review

METAL MORNING THOUGHTS

Harley Benton GPA-400 vs Orange Pedal Baby 100 power amp , which one's for you?

Paul Bradshaw

Harley Benton gpa400 solid state guitar power amp with Rocktron Voodu Valve online guitar preamp

aryo aditomo

Reviews

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PROS

Extremely lightweight at only 3kg, ideal for gigging musicians
Transparent sound, accurately reproduces input without colorization
Effectively reduces harsh trebles and fizzy tones
Well-suited for high-end modelers and preamps
Sturdily built, able to withstand frequent transport
Devastatingly loud, capable of handling live performances
Versatile tone controls for balancing different speaker boxes
Runs cool, preventing overheating during extended use
Inexpensive alternative to costly tube amps
Push-button mute switch and signal indicators for easy control

CONS

Plastic knobs feel cheap and may require replacement
High frequencies can sound shrill without proper EQ adjustment
Tone pot sensitivity is limited, with a narrow usable range
Not suitable for achieving over-driven valve power stage sound
Stereo mode may cause phase cancellation with certain setups

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Harley Benton GPA-400.

Comparisons

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The GPA-400 was noted for its flatter sound and massive low end compared to the Orange Pedal Baby's more characterful, responsive feel with a noticeable push around 4k Hz.
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Features and functionality

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Owners highlighted the GPA-400's capability for stereo output and being a rack unit, which appeals for certain live sound setups.
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The GPA-400 includes an EQ section, allowing users some flexibility to tailor their sound depending on the cabinet used.
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Users report seamless integration with audio interfaces, directly connecting without the need for a reamp box, despite concerns about impedance mismatch.
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Use cases and applications

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It was mentioned that the GPA-400 feels more like a monitor through the cab, which may appeal to those seeking a particular flat response in live settings.
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It's noted that the GPA-400 performs well for stage volume in guitar applications, suggesting versatility beyond bass use.
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Users appreciate the convenience of the GPA-400's IEC power supply, allowing for streamlined cabling with splitters for power management.
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Owners successfully use the GPA-400 with both direct IR to front-of-house and as an onstage power amp, enhancing live sound versatility.
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Value and pricing

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Despite positive reviews, some users compare it to higher-priced options like the Seymour Duncan power stages, viewing the GPA-400 as a cost-effective choice.
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Software and compatibility

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The GPA-400 effectively powers setups with Neural's VSTs, delivering a sound comparable to a real amp through a cabinet.
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User experience

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One user shared that the GPA-400 paired with the Gojira Plugin created a convincing amp-like sound, highlighting its capability in modeling applications.
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