Name: Soundstream Stealth ST4.1000D
Brand: Soundstream
SKU: 530ST410KD
Rating: 4.5 (90 reviews)

Overview

by Crutchfield's

Big sound, small package

If you're in need of an amplifier that takes up liitle space but delivers a big sound, Soundstream's Stealth amplifiers can fill the bill. At about 3" deep by 7-1/2" wide, the ST4.1000D 4-channel amp will fit just about anywhere, delivering 90 watts per channel to your front and rear speakers, or up to 250 watts per channel in 2-channel mode to your subs. That's a lot of power in a tiny package.

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Big sound, small package

You're in control

The ST4.1000D also features high- and low-level inputs for a variety of applications, and includes high- and low-pass filters to help you tailor your sound. And Soundstream built this amp for the long haul with its 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.

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Product highlights:

4-channel car amplifier
90 watts RMS x 4 at 4 ohms (125 watts RMS x 4 at 2 ohms)
250 watts x 2 bridged at 4 ohms
variable high- and low-pass filters (35-250 Hz, 12 dB/octave)
Class D amp technology
MOSFET power supply
preamp and speaker-level inputs
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 1.5"H x 3-1/8"D
warranty: 1 year
Our 60-day money-back guarantee
MFR # ST4-1000D

What's in the box:

Soundstream Stealth ST4.1000D owner's manual

4-Channel Class D amplifier
One 30A ATM fuse (installed)
Two 8.25" Speaker-level input harnesses (with 5-pin Molex connector)
Two 6" Line-level input harnesses (Stereo female RCAs on one end and 5-pin Molex plug on other end)
6" Speaker output harness (with 8-pin Molex connector)
6" Power harness (with 6-pin Molex connector)
4 Self-tapping screws (Length=5/8")
Owner's manual

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Details

Researched by Crutchfield's Mark G.

Features & specs

Performance
RMS Power Output (Watts x Channels)	90 x 4
Peak Power Output (Watts x Channels)	500 x 2
Power at 2 Ohms (Watts x Channels)	125 x 4
Bridged Power (Watts x Channels)	250 x 2
Minimum Impedance Bridged	4
Minimum Impedance Unbridged	2
Minimum Impedance	2
Best Frequency Response	20-30000 Hz
THD at Rated RMS Power	0.05%
Signal to Noise Ratio	70 dB
Input Voltage	14.4v
Features
Amplifier Class	D
Low-Pass Crossover Frequency	35-250 Hz
Low-Pass Slope (dB/octave)	12 dB/oct
High-Pass Crossover Frequency	35-250 Hz
High-Pass Slope (dB/octave)	12 dB/oct
Bass Boost	No
Bass Boost Frequency	N/A
Fan Cooled	No
Fuse Rating	30
Speaker Level Inputs	Yes
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

Features
Controls
Connections

Features

Overview: The Soundstream Stealth-series amplifiers pack a powerful punch from a small chassis. This 4-channel, full-range Class D amplifier can drive two pairs of speakers, or two subwoofers, without taking up a lot of space.

Power Output: The ST4.1000D micro-mini amp delivers 90 watts x 4 channels at 4 ohms, and 125 watts x 4 at 2 ohms. Bridged output is 250 watts x 2 (4 ohms).

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 two supplied high-level input harnesses. If you're using the preamp outputs from the source unit, you can plug in your RCA cables into the two low-level input harnesses. 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 inputs, 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 white 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.

Controls

Gain: The ST4.1000D's rotary gain controls let you match the amp's input sensitivity to the output of the source unit. There are independent gain controls for the front and rear channels of the amp. 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.

Crossovers: The amp features independent 12 dB/octave crossovers that can be set to High-pass (HPF), Full Range, or Low-pass (LPF). The cutoff frequencies can be independently set between 35Hz and 250Hz using the rotary controls.

Connections

Molex Connections: The Soundstream ST4.1000D 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.

Remote Turn-On: The blue wire in the power 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 the source unit's speaker wires to the two High-Level Input harnesses and plug them into the amp's Molex connectors.

Low-Level Input: The amp's two Low-Level input harness each have 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 4 speakers. Speaker wires should be spliced onto the speaker output harness.

Accessories

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Q&A

19 questions already asked

Can this be mounted behind stereo?

[ ISAAC Mar 19, 2022 ]

2 answers

Depending on how much room you have behind your setup but it's small enough to possibly fit. Keep in mind that your wiring is going to take up more space.

[ JOSE Mar 20, 2022 ]

It can be mounted anywhere you have space. I had it mounted on top of my radio inside the fairing of a harley davidson touring bike

[ JOE Mar 19, 2022 ]

Can this amp be mounted behind stereo?

[ ISAAC Mar 19, 2022 ]

1 answer

This will depend largely on your vehicle. For details on installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on fit and what you will need for an installation.

[ KENNETH Mar 21, 2022 ] Staff

Will this hook up to the factory head unit in my 2011 Subaru Forester?

[ Zack Dec 31, 2021 ]

1 answer

You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.

[ KENNETH Jan 03, 2022 ] Staff

How do you connect the 10 gauge to the 2 18 gauge power and ground wires?

[ Jose Sep 19, 2021 ]

1 answer

We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.

[ Thomas Sep 22, 2021 ] Staff

If this is mounted under the steering wheel on a jeep wrangler, will it most likely overheat?

[ JEFFREY Jul 24, 2021 ]

1 answer

It should really some air flow going to it, but that's not to say it wouldn't be enough in that location. Hey, trial and error right?

[ MATTHEW Jul 25, 2021 ]

Could I use this amp to power two small sub woofers simultaneously? I'm trying to run two dual 10 in subs and was wondering if this could power them both

[ ANGEL Jun 16, 2021 ]

1 answer

This amp is compatible with select 10" subwoofers. I recommend contacting an advisor by calling 1-800-324-9695 to discuss your goals and gear to check if this will work for you.

[ JASON Jun 29, 2021 ] Staff

Can you run 2 channels at 4 ohms and 2 channels at 2 ohms? My vehicle has 6 speakers. The front run in parallel at 2 ohms and the back are 4 ohm

[ Brandon Mar 19, 2021 ]

1 answer

Yes you can ...but make sure is 2ohm and 4 ohm..maybe a may over heat ..but is is to run it like that

[ MIGUEL Mar 19, 2021 ]

Will this amp work with my Kicker 43C124 12" 300W 4 Ohm pair of subwoofers? RMS handling is 300 watts for the pair and impedance is Single 4 Ohm.

[ Chug Sep 18, 2020 ]

1 answer

Thanks for your question. For information on selecting the best amp for your subs I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system.

[ KRISTINA Oct 07, 2020 ] Staff

Can two of these amps connect to each other?

[ MARCUS Aug 06, 2020 ]

1 answer

Can you elaborate?

[ ERNIE Aug 06, 2020 ]

If I installed this 4 channel amp into a 2013-2018 Ram 1500 truck (that has 6 speakers total), can I send 2 of the channels to the rear 6x9s, and then split the other 2 channels to 4 speakers up front? It has a 3.5 inch and 6x9 inch speaker front left & front right. Would I get 90 watts RMS @ 4 ohms x 2 channels for the rear, and then 125 watts RMS @ 2 ohms x 2 channels for the front 4 speakers? At that point the 3.5 inch / 6x9 on each side see 62.5 watts RMS a-piece? If someone can check the math on this it's appreciated.

[ BG May 27, 2020 ]

How to wire this amp at 2ohms with 4 4ohm speakers to get the 125?

[ Tae215 May 08, 2020 ]

1 answer

Im pretty sure if you wire them in parallel , that will drop your ohm usage to 2 ohms but only if they are a signal voice coil speaker

[ Geremy May 08, 2020 ]

Should I use the manual setting for hi and low crossovers or set to full with my 4) 2 way Polk Audio DB 652 speakers?

[ CHRISTOPHER May 02, 2020 ]

3 answers

Just make sure you reed about it ..but this amp is really strong and can push anything ..I do love it and is really small too!!

[ MIGUEL May 02, 2020 ]

If you have a subwoofer, use the crossover. If you don't, run it fall.Enter an answer to this question.

[ GREG L May 02, 2020 ]

Hey bud! I would suggest running the amp on full. This prevents the amp from running only "high" frequencies (no bass), or "low" frequencies (no tweeter). Full will allow the broad scope of sound to emit from the speakers. If your head unit doesn't have a feature that allows you to adjust the sound settings, look into an equalizer setup that will let you do that. Hope this helps!

[ ERNIE May 02, 2020 ]

Can I run this without a line out converter? I'm trying to use my factory radio and would prefer to go direct from HU to amp to speakers w/o having to splice in and do RCAs - just speaker wire all the way through. Can this handle that cleanly?

[ CHRISTOPHER Apr 11, 2020 ]

1 answer

Yes ir comes with rca adapter and speaker wire outputs so the choice is yours od which you want to use

[ Jason Apr 21, 2020 ]

Is this small enough to fit under a front seat in a sedan?

[ Parker May 04, 2019 ]

6 answers

It's about the layout of a dollar bill. So if your seat has about 2 inches of clearance it will fit.

[ Joshua May 06, 2019 ]

Yes it is...it also can fit in your glove department.

[ Aaron May 05, 2019 ]

I should think so. I installed mine in the dash of my 2006 Honda Accord. It works really well. I am very happy with the purchase. Made a huge improvement to the sound in my car. I would buy this again.

[ Lee May 05, 2019 ]

Yes! It should fit under any sedan seat that I've ever seen, it's in my glove box for your information..

[ thomas May 05, 2019 ]

Yes very easily

[ KENT May 04, 2019 ]

It should be yes! I'd give it a go

[ travis May 04, 2019 ]

Is this able to power two 6x9 speakers and a 12" sub? I have 2 Polk DB 692 read deck speakers and a Sound Ordinance B-17 subwoofer that need to be powered. Any answers, info, or suggestions would be greatly appreciated.

[ TOMMOTHEKILLA® May 21, 2018 ]

4 answers

No, It would be enough power to message the 6X9's in the rear deck! But a Sub want even begin to move off the power of this micro amp! I recommend rigging the speakers! A mono amp for the 12" would do you so much better! Remember spend your money right the first time!

[ Albert May 22, 2018 ]

I do know it will power 2 pairs of Polk speakers with no problems but to be honest I do not know about a sub.

[ GARY May 21, 2018 ]

Yes it has hp and lp filters on each set of channels and they're bridgeable you'll love it plenty of power for all of your needs!!!!

[ JOHN L May 21, 2018 ]

This is a great little amp. Depending on how loud you like your sound and your bass, it would handle a 12" 4 ohm sub, or 2 8 ohm 8" subs (wired in parallel), which might give you better results than a single 12" with 250 watts. It's all dependent on how loud you like your sound and bass. I'm not familiar with the Sound Ordinance 12" sub, but as long as it has decent efficiency at 4 ohms, it should work well.

[ Cary May 21, 2018 ]

The wire harness has two power wires. Do you need to connect both to power or just one?

[ MICAH Dec 15, 2017 ]

2 answers

Spoke with Soundstream tech support and they said both red wires need to be combined and connected to power. (battery). Same holds true for the ground (black) wires. Combine them and ground them.

[ CHRISTOS Jun 14, 2018 ]

It's been months since I've installed this, but one power wire should go to constant power and the other power wire needs to go to the plus 5 volt amp turn on from the back of your head unit

[ JOHN Dec 16, 2017 ]

Can I bridge 2 channels to power a small sub woofer and not bridge the other 2 to power 2 6x9 speakers and have it all running simultaneously?

[ Johnathan Jan 18, 2016 ]

3 answers

Short answer: Yes, I would certainly think so, but I do not know from first-hand experience. My reasoning and instructions on how to complete the task are explained below, if you are interested. Also, I am unsure if this amp needs to be put into a "bridge mode" before bridging. Before doing so, I would ask one of the very-helpful Crutchfield technicians and have them confirm everything I have told you. Information: As is stated in the product's description, you can bridge 2 channels to attain 250 watts of power with 4 ohms of resistance. However, that is not stated to be RMS (which basically means the power at which it will run consistently), and what they mean by channel is not clearly stated. On this amplifier are 2 channels: front and rear. Technically, however, the front channel consists of two channels (left and right) and the rear is simply a duplicate of the front channel (making 4 channels total), as music is almost always recorded in 2.1 channels of audio (left and right), where the .1 means a subwoofer. Instructions: First, to complete this task, you need to transmit the correct information to the amp. You want subwoofer information, not speaker information. To do this, run an RCA cable from the sub-out port of your receiver/radio and plug them into the "rear channel" port of your amp. This will send only subwoofer information to the rear channel, which is what your sub, and you, will want. Also, on your amp, make sure your low-pass filter is set to a low frequency (around 30 Hz) and your high-pass filter is set somewhere around 80 Hz. Second, when bridging an amplifier, you connect the positive lead of Channel ONE (or left channel) to the positive terminal of the subwoofer. Then, you connect the negative lead of Channel TWO (or right channel) to the negative terminal of the subwoofer. My only concern for this amp is that the harness uses a small gage, like 20 AWG, and I fear it may struggle to allow enough current to transmit the higher power.

[ James Jan 21, 2016 ]

Short answer: Yes, I would certainly think so, but I do not know from first-hand experience. My reasoning and instructions on how to complete the task are explained below, if you are interested. Also, I am unsure if this amp needs to be put into a "bridge mode" before bridging. Before doing so, I would ask one of the very-helpful Crutchfield technicians and have them confirm everything I have told you. Information: As is stated in the product's description, you can bridge 2 channels to attain 250 watts of power with 4 ohms of resistance. However, that is not stated to be RMS (which basically means the power at which it will run consistently), and what they mean by channel is not clearly stated. On this amplifier are 2 channels: front and rear. Technically, however, the front channel consists of two channels (left and right) and the rear is simply a duplicate of the front channel (making 4 channels total), as music is almost always recorded in 2.1 channels of audio (left and right), where the .1 means a subwoofer. Instructions: First, to complete this task, you need to transmit the correct information to the amp. You want subwoofer information, not speaker information. To do this, run RCA cables from the sub-out port of your receiver/radio and plug them into the "rear channel" port of your amp. This will send only subwoofer information to the rear channel, which is what your sub, and you, will want. Also, on your amp, make sure your low-pass filter is set to a low frequency (around 30 Hz) and your high-pass filter is set somewhere around 80 Hz. Second, when bridging an amplifier, you connect the positive lead of Channel ONE (or left channel) to the positive terminal of the subwoofer. Then, you connect the negative lead of Channel TWO (or right channel) to the negative terminal of the subwoofer. My only concern for this amp is that the harness uses a small gage, like 20 AWG, and I fear it may struggle to allow enough current to transmit the higher power.

[ James Jan 21, 2016 ]

Provided your subwoofer configuration presents a minimum 4 Ohm load to the bridged channel, yes, you can use this amplifier in the configuration you've described. I hope that helps! My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=5

[ Ryan Jan 20, 2016 ] Staff

Do you have to feed both inputs Front/rear with a signal to get output on all four channels?

[ Paul Jan 01, 2016 ]

3 answers

Yes, that is the easy way. However, there is a trick you can try if you only have 1 set of outputs from your headunit (a single left & Right output), you could use Male RCA Y-spliters to turn your single stereo R & L channels into 2 L & 2 R channels. You would not have a front to rear fader in this alternative set up but it is worth a try if you are limited to a single set of stereo outputs on your head unit. At least it would give you 4 channels... Obviously, if you have both a front and a rear set of Stereo channels on your headunits output, that is the best way to go because you could use a fader from front to rear with 4 independent channels

[ DONALD Jan 02, 2016 ]

yes

[ MICHAEL Jan 02, 2016 ]

yes, the amp will only produce amplified signals (output) on the same channels that are receiving frequencies (input) via RCA cable or high voltage signals

[ MICHAEL Jan 02, 2016 ]

Can it run 3 channel mode and do half what it says it can? I installed pro for 20yrs, have been out of it sense 03, I can not believe something smaller than .. .... can make that kind of power.

[ Kraig Jul 01, 2014 ]

2 answers

Here's the deal. This is a $140 amp, and if you buy it thinking that you're going to get the same type of power output as a 1000 watt amp that weighs 40 lbs and costs a thousand dollars, you're going to be disappointed. That said, it's a solid little amp than has been bumping along in my little 40 year old Datsun 240Z for the past three months, pushing enough power to overcome a significant amount of road noise. Output is clean, and the noise floor is low enough to not be audible when the car is running. I'd guess that it's probably pushing 200 real-world watts, which, if you feed it clean signal and use it with high-quality, efficient drivers, should be enough to make you happy.

[ Scott Jun 24, 2015 ]

[ KRISTINA Jul 09, 2014 ] Staff

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