Soundstream ST1-700D

Mono subwoofer amplifier — 450 watts RMS at 2 ohms

  • Soundstream ST1-700D


  • Soundstream ST1-700D

  • Soundstream ST1-700D

  • Soundstream ST1-700D

  • Soundstream ST1-700D

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Our take on the Soundstream ST1-700D

by Bob Bihlmayer

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.

Big sound, small package

Are you struggling to find the space for great sound in your ride? If you're in need of an amplifier that takes up a small space but delivers a big sound, Soundstream's Stealth amp line can fill the bill. At about 3" deep by 7-1/2" wide, the ST1.700D mono amplifier will fit just about anywhere, delivering up to 450 watts of sub-shaking signal at 2 ohms. That's a lot of power in a tiny package.

You're in control

The ST1.700D also features high- and low-level inputs for a variety of applications, and includes low-pass and subsonic filters to help you tailor your sound. And Soundstream built this amp for the long haul, with a MOSFET power supply and military-spec circuit board, surrounded by an aluminum alloy heatsink and guarded by full short-circuit, thermal, and overload protection circuitry. This Soundstream Stealth amp will help you to take a big step towards great sound.

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  • mono subwoofer amplifier
  • 300 watts RMS x 1 at 4 ohms (450 watts RMS x 1 at 2 ohms)
  • Class D amp technology
  • variable low-pass filter (35-250 Hz, 12 dB/octave)
  • variable subsonic filter (10-50 Hz)
  • bass boost (0-12 dB at 45 Hz)
  • MOSFET power supply
  • preamp and speaker-level inputs
  • includes dash-mount gain control
  • fuse rating: 30A x 1
  • 10-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • dimensions: 7-1/2"W x 1-1/2"H x 3-1/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
RMS Power Output (Watts x Channels) 300 x 1
Peak Power Output (Watts x Channels) 700 x 1
Power at 2 Ohms (Watts x Channels) 450 x 1
Bridged Power (Watts x Channels) N/A
Minimum Impedance Bridged N/A
Minimum Impedance Unbridged 2
Best Frequency Response 20-150 Hz
THD at Rated RMS Power 0.5%
Signal to Noise Ratio 70 dB
Input Voltage 14.4v
Amplifier Class D
Low-Pass Crossover Frequency 35-250 Hz
Low-Pass Slope (dB/octave) 12 dB/oct
High-Pass Crossover Frequency N/A
High-Pass Slope (dB/octave) N/A
Bass Boost 0-12 dB
Bass Boost Frequency 45 Hz
Fan Cooled No
Fuse Rating 30
Speaker Level Inputs Harness
Preamp Outputs No
Width (inches) 7-1/2
Height (inches) 1-1/2
Depth (inches) 3-1/8
Parts Warranty 1 Year
Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • Mono block Class D amplifier
  • One 30A ATM fuse (installed)
  • 8.25" Speaker-level input harness (with 5-pin Molex connector)
  • 6" Line-level input harness (Stereo female RCAs on one end and 5-pin Molex plug on other end)
  • 6" Speaker output harness (with 4-pin Molex connector)
  • 6" Power harness (with 6-pin Molex connector)
  • Remote Bass Boost Control module (with 2 mounting screws)
  • 4 Self-tapping screws (Length=5/8")
  • 16.5' Remote Bass Boost Control cable (RJ-25 plug on one end and 3.5mm plug on other end)
  • Owner's Manual
  • Power Harness Wiring Diagram

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.



Overview: The Soundstream Stealth-series amplifiers pack a powerful punch from a small chassis. This mono block, Class D amplifier can drive a subwoofer or two, without taking up a lot of space.

Power Output: The ST1.700D micro-mini amp delivers 300 watts at 4 ohms, and 450 watts at 2 ohms, from its single output channel.

High/Low Level Input: The amp includes plug-in harnesses for both high-level and low-level inputs. Speaker wires from the source unit can be spliced onto the supplied high-level input harness. If you're using the preamp outputs from the source unit, you can plug in your RCA cable into the low-level input harness. Both harnesses have a 5-pin Molex connector that plugs into the amp's Hi/Lo Input.

Note: If you're using the high-level input, you do not need to run a remote turn-on lead. The amplifier will automatically turn on when it senses an input signal.

LEDs: The amp features two LEDs to indicate the status of the amplifier. The green LED will glow when the power to the amplifier is on. When the red LED glows, the amplifier's protection circuitry is engaged, shutting down the amp.

Protection Circuitry: The protection circuitry will shut down the amplifier for the following conditions:

  • Overheating: Thermal protection can be caused by too low of an impedance or inadequate air flow around the amplifier.
  • Over-/Under-Voltage: The amp will shut down if the voltage to the amp is not within 10 to 16.8 Volts DC range.
  • Short Circuit: When speaker wires become shorted to each other or to the vehicle chassis, the amplifier will shut down.


Gain: The ST1.700D's rotary gain control lets you match the amp's input sensitivity to the output of the source unit. The input sensitivity range of the amplifier is continuously variable between 0.5V and 12V. A small screwdriver (not included) is required to set the gain.

Low Pass: The amp features a 12 dB/octave low pass filter that is constantly engaged. The cutoff frequency can be set between 35Hz and 250Hz using the rotary control.

Sub Sonic Filter: The Sub Sonic filter removes ultra-low frequencies that cannot be reproduced by most subwoofers. These frequencies do not become sound, but unnecessary oscillations which affect sound by causing distortion. These frequencies also waste amplifier power and can cause damage to speakers. The filter's crossover point is variable from 10 to 50 Hz. (No slope is given for the Sub Sonic filter.)

Bass Boost: The Bass Boost enhances the low frequency response of the amplifier. You can dial in up to +12dB of boost, centered at 45 Hz, using the rotary control.


Molex Connections: The Soundstream ST1.700D uses compact Molex connectors which plug into the amplifier for the amp's input, speaker output, and power/ground/remote turn-on connections.

Power: The Power/Ground/Remote harness contains two 16-gauge red +12V power wires. These should both be spliced to your power wire (not included) which runs from the amp to your battery. You should use at least a 10-gauge power wire to the battery, with an in-line 30A fuse no more than 18" from the battery terminal.

Ground: Like the power wires, there are two 16-gauge black ground wires. Both should be spliced to a larger gauge ground wire (not included) and attached to a metal area close to the amplifier. The ground wire should be the same gauge as the power wire.

Note: There is also a dark blue "secondary ground" wire in the harness. Generally, it should be connected to the main ground wire. However, if engine noise appears in the system, the dark blue wire should be connected to the source unit's chassis ground.

Remote Turn-On: The orange wire in the harness is for the amplifier's remote turn-on circuit. This should be spliced to a remote wire (18-gauge typically) that runs to the source unit. This connection is not needed if you are connecting the amplifier to the source unit via a high-level input.

High-Level Input: If you're connecting the amplifier to a factory head unit, or a unit that does not have preamp outputs, you should use the amp's high-level input. Splice two of the source unit's speaker wires to the High-Level Input harness and plug it into the amp's Molex connector.

Low-Level Input: The amp's Low-Level input harness has two female RCA connectors that will accept the plugs of an RCA patch cable from the head unit. The other end plugs into the amp's Molex connector.

Speaker Outputs: The amp features a speaker output harness with connections for up to 2 speakers (or one speaker with dual voice coils). You can use one pair (+ and -) if you only have one speaker to connect, and tape off the other pair to prevent short circuiting. The amplifier will accept a load with an impedance of no less than 2 ohms.

Remote Bass Boost Control: The amp is equipped with a 3.5mm connection for the supplied Remote Bass Boost Control. The remote module can be mounted under the dash or another location near the driver's seat. A 16-1/2' cable connects the module to the amplifier. The Remote Bass Boost Control can adjust the speaker output between 0dB and 18dB.

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Soundstream ST1-700D Reviews

Average Customer Review:

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5 out of 5

Little footprint BIG sound!

Written By Anonymous, Atlanta on Thursday, September 25, 2014
Crutchfield Customer Review (What's this?)
This amp was just what I was looking for. Wanted something that fit in the factory location on a 2004 Expedition and was hidden from sight. This amp was a perfect fit and powered the aftermarket 8" sub perfectly which is also in the factory location.
Fits in tight spaces, offers good power, and is relatively inexpensive.
I should have bought it sooner!
1 out of 1 people found this helpful
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5 out of 5

Great little amp!

Written By James, Tampa, FL on Wednesday, August 20, 2014
Crutchfield Customer Review (What's this?)
This little amp is running a JL 6w3v3 in a 2013 MINI Cooper S and I couldn't be happier. It pushes the little woofer to its limits and I have also test it with a 12" Arc audio sub in a sealed box and it powered it with authority. The amp is installed under a seat next to another digital amp that runs my mids and highs and I have had no issues with heat.
Very small - ie it would be like a 1.25" thick smartphone. Runs cool and very efficient
The power wires are like 12 gauge at best and there are two sets of them. It made connecting this to power distribution block a bit of a challenge to make sure they were installed securely.
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4 out of 5

Perfect for small spaces

Written By alusteg, La Mesa, CA on Sunday, August 10, 2014
At first I was out off by this amp because of wiring harnesses it has have 16 gauge wires coming out and that's pretty small to be running for power and a ground but after splicing them to my already existing 10 gauge wiring I was really impressed with the results. I have it running my 12" JL Audio w0v3 4ohm sub. It hits just as hard as my previous amp but with more than half the size reduction. Overall I am very satisfied with this amp but I gave it 4 stars because of the small wiring hassle.
Small in size but just as strong and powerful as any comparable amp but with half the size requirement.
16 gauge wiring is a small problem considering most amp wiring is 10 or 12 gauge so some splicing/soldering is required.
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5 out of 5

problem solved

Written By Brubetech, Crawfordsville, IN on Sunday, July 06, 2014
Crutchfield Customer Review (What's this?)
Installing a sub in my classic corvette was stressful. I needed to maintain the look and t-top storage while adding some low end. I fabricated a small compartment in of of the three compartment doors for an 8 inch sub. I needed a small amp that would provide decent power, having used sound stream in the past I give this one a shot. Couldn't be happier, this little amp provides serious power & Sound Stream quality. Pushing 250 watts at 4 ohms to a 8 inch Kicker Comp provided more bass than i expected. Very happy with my choice planning to add the 4 channel version for the 6x9's and 4x6's soon.
Lots of power from a very small package, Sound Stream quality, and low price. This amp is worth twice the price.
The wiring harness's can make cable management interesting, but well worth the trade off
2 out of 2 people found this helpful
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2 questions already asked

If I purchase this amp, what wiring kit would be best suited for this and one sub. Also, can I hook up a pair of speakers with tweeters along with the sub or is that not a necessary thing? [ Mason S.  Oct 07, 2014 ]
1 answer
  • I forwarded your question to an Advisor and they responded with the following: The Soundstream ST1-700D amplifier is a mono amplifier. It is only designed to power subwoofers (as they are mono). The EFX 10-gauge amplifier wiring kit would be a great choice for deliver an input signal, power, and ground. If you need to connect speakers as well, he'll need to purchase a different amplifier. Check out these great articles: http://www.crutchfield.com/learn/learningcenter/car/amplifiers/shopping_guide.html?showAll=N If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy Staff  Oct 08, 2014 ]
I'm looking to add to my factory head unit and thus use the high level inputs. Is this amp capable of not needing the remote turn on wire and instead sensing / using the signal from the high level inputs to turn on? Thank you in advance. [ Michael  Jul 21, 2014 ]
1 answer
  • I forwarded your question to an Advisor and they responded with the following: The amp has auto-turn-on capability via high input signal, so yep. Make sure they don't skimp on amp wiring. I recommend 575RFK10. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy Staff  Jul 22, 2014 ]

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For a more in-depth review and enhanced detailed information on the Soundstream ST1-700D, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_530ST1700D/Soundstream-ST1-700D.html ).