Boston Acoustics GTA amplifiers use some of the same technologies found in their top-of-the-line GT Reference amps to give your music a powerful boost. And these attractive amps deliver the sonic goods at a reasonable price.

The 5-channel GTA-1005 amplifier puts out 50 watts RMS per channel to your front and rear speakers, plus up to 400 watts RMS to a subwoofer system — plenty enough power to get your entire system rockin'. Boston Acoustics' Q-Tune™ technology lets you tune your bass so you get maximum performance from your sub/enclosure combination. The inputs feature special noise-cancellation circuitry that ensures clean reproduction of your music all the way through to your speakers.

You'll find all connections and adjustment controls recessed on one side of the amp, for a neat installation and easy adjustment. Variable high- and low-pass filters let you tune the amplified signal so your system can sound its best. An optional wired remote control gives you the power to tweak the sub level from the front seat.

Product Highlights:

  • 5-channel amplifer
  • 50 watts RMS x 4 at 4 ohms + 250 watts RMS x 1 at 4 ohms
  • 80 watts RMS x 4 at 2 ohms + 400 watts RMS x 1 at 2 ohms
  • 160 watts RMS x 2 bridged at 4 ohms + 250 watts RMS x 1 at 4 ohms
  • CEA-2006 compliant
  • variable high- and low-pass filters on front and rear channels (50-200 Hz, 12 dB/octave)
  • variable low-pass filter on subwoofer channel (50-150 Hz, 12 dB/octave)
  • variable subsonic filter on sub channel (10-50 Hz, 12 dB/octave)
  • Q-Tune technology variable bass boost on sub channel
  • optional wired remote subwoofer level control
  • Symmetrical Signal Technology (SST™) uses asymmetrical balanced inputs for noise cancellation
  • preamp and speaker-level inputs
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 21-1/4"W x 2-3/8"H x 8-9/16"D
  • warranty: 2 years
  • Our 60-day money-back guarantee

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Hands-on research

What's in the box?

Download owner's manual

  • 5-Channel amplifier
  • Six 25-amp ATO fuses (3 installed/3 extra)
  • Three 12" Speaker-level input harnesses
  • Four 3/4" Self-tapping screws
  • 2mm Alen wrench
  • 3mm Alen wrench
  • 4mm Alen wrench
  • Owner's Manual
  • Warranty information

Product Research

Features
Controls
Connections

Features

GTA-series Amplifiers: The Boston Acoustics GTA-1005 amplifier is part of the GTA-series; this 5-channel amp uses a standard AB design for the front and rear channels, and an efficient Class-D design for the subwoofer channel to deliver increased power into lower impedances. The low profile design makes installation in tight locations easier.

2-Ohm Stable: The GTA-1005 can be connected to loads with impedances as low as 2 Ohms; the lower the impedance, the higher the output power:

  • Front and Rear Channels:
    • 50 watts x 4 @ 4 ohms
    • 80 watts x 4 @ 2 ohms
    • 160 watts x 2 @ 4 ohms (bridged)
  • Subwoofer Channel:
    • 250 watts x 1 @ 4 ohms
    • 400 watts x 1 @ 2 ohms

Controls and Terminals: All the controls and terminals are conveniently mounted on one side of the amp.

Controls

Gain: Each of the three inputs has its own rotary gain control knob to adjust the input sensitivity; the range is 0.2 Volts to 5.0 Volts (line-level) or 0.4 Volts to 10.0 Volts (speaker-level).

Crossover Switch: Choose from high-pass, low-pass, and off (full range) for the crossover on the front and rear channels.

Crossover Frequency: The front and rear channel crossover (low-pass or high-pass) points are continuously variable from 50 Hz to 200 Hz; the slope is 12 dB/octave.

Subwoofer Low-pass Filter: The low-pass filter on the subwoofer channel is always on and controlled using a rotary knob; it is continuously variable from 50 Hz to 150 Hz; the slope is 12 dB/octave.

Subsonic Filter: The subsonic (high-pass) filter on the subwoofer channel is always on and controlled using a rotary knob; it is continuously variable from 10 Hz to 50 Hz; the slope is 12 dB/octave.

Q-Tune: Once the subsonic crossover point has been determined, use the rotary Q-Tune control to increase the bass information centered around the crossover point.

Connections

Speaker-level Input: Each of the three inputs (front channel, rear channel, and subwoofer) has an independent Molex plug for use with the included harnesses when the receiver has no RCA outputs.

Line-level Input: Each of the three inputs has left and right RCA jacks for the input signal from the head unit.

GTA-RSL: RJ-14 port; connect an optional GTA-RSL remote subwoofer level control (item number 065GTARSL, sold separately).

Speaker Output: Four pair of set-screw terminals provided for connecting the front and rear channel speakers; the terminals can accept up to 10-gauge wire; the set screws are tightened/loosened with the supplied 2mm Alen wrench.

Subwoofer Output: One pair of set-screw terminals provided for connecting a subwoofer; the terminals can accept up to 8-gauge wire; the set screws are tightened/loosened with the supplied 3mm Alen wrench.

ATO Fuses: Three 25-amp ATO-type fuses are located between the speaker and power terminals.

Power/Ground: Two set-screw terminals for connecting power and ground wires; each terminal accepts up to 4-gauge wire; the set screws are tightened/loosened with the supplied 4mm Alen wrench.

Remote: Set-screw terminal for connecting the remote wire; terminal accepts up to 8-gauge wire; the set screws are tightened/loosened with the supplied 3mm Alen wrench

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Boston Acoustics GTA-1005 Reviews

Average Customer Review:

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Great Amp

Written By Josh R, Austin, TX on Thursday, February 10, 2011

Crutchfield Customer Review (What's this?)

This thing sounds fantastic!

I am driving of course my front and rear channel speakers but also A Kicker dual 12" DVC
sub system. This amp drives them perfectly well and has never cut out.

The sound quality at high volume is so much better than my stock HU.

For $250 this really is a steal. I highly recommend it.

Great Amp!

Written By cdubbs, Brooklyn NY on Wednesday, February 09, 2011

Crutchfield Customer Review (What's this?)

This is a great amp that will power your entire system. Highly recommended and Crutchfield
has the lowest price.

Get everything you’ll need to enjoy your new Boston Acoustics GTA-1005

You'll need an amp wiring kit to install your new amplifier, as wiring is not included.
Bring the music from your amp to your speakers.
Patch cables take the music from your stereo to the amplifier. Most amp wiring kits don't include them.
The right tools will make the installation easier.
T-Spec 4PK Installation Kit

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EFX PA4BX Wiring Kit

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Rockford Fosgate RFK4X

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Complete 4-gauge amplifier wiring kit
Includes patch cable and speaker wire

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Rockford Fosgate RFK4

Rockford Fosgate RFK4

4-gauge amplifier power wiring kit

Item #: 575RFK4

(10)

$114.99
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T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1

(30)

T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW16WB1

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Stinger PRO Series Speaker Wire

Stinger PRO Series Speaker Wire

Priced per foot (16 Gauge)

Item #: 541SPW516B

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T-Spec 2-Channel RCA Patch Cables

T-Spec 2-Channel RCA Patch Cables

Available in 7 different lengths (20-foot)

Item #: 120RCA202

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EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Reference Series Multi-Core RCA patch cables — available in 5 different lengths (25-foot)

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Pro.Fit Wire Worm

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Installation tool helps route wiring through tight spaces

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