Soundstream ST4.1000DB ST4.10000DB Stealth Series 1000W Class D 4-Channel Amplifier
Quick take
The Soundstream ST4.1000DB is a compact 4-channel Class D marine amplifier designed for space-limited audio builds, with built-in Bluetooth for direct phone playback. Buyers tend to like its power-per-inch and clarity, especially in trailers, classic cars, and motorcycle/ATV-style installs. The main caution is that correct wiring and setup matter, and a small number of reports point to confusing remote-wire orientation and occasional out-of-box defects.
Pros and cons
Pros
- 4-channel Class D design for efficient power in a small chassis (7.5 x 3.88 x 1.5 inches).
- Built-in Bluetooth lets you play from a phone or other mobile device without an extra receiver.
- Adjustable crossover options with variable high- and low-pass filters (35-250 Hz, 12 dB/octave).
- Strong channel output ratings for a compact amp, including 90 W RMS x 4 at 4 ohms (125 W RMS x 4 at 2 ohms).
Cons
- Review evidence is mixed, with limited detail on long-term reliability and some reports of out-of-box issues.
- Some installations may need extra care with remote input/output wiring, since confusion has been reported.
What buyers think
Buyer-review evidence for this amplifier is limited but includes recurring themes around compact size, sound quality, and getting strong volume without needing a large amp footprint. Several buyers describe successful installs in tight or non-traditional spaces such as trailers, classic cars, and motorcycle setups, and mention clear sound and adequate power headroom. There are also a few negative reports related to wiring/remote lead orientation confusion and at least one account of an out-of-box defect. Overall, the review pattern suggests the amp can be a practical power upgrade for small builds, as long as installation wiring is done carefully and you verify the unit’s condition promptly.
Key features that matter for real installs
Efficient 4-channel power for compact systems
This Soundstream model is built as a Class D amplifier with multiple power ratings depending on load and configuration. The published channel output includes 90 watts RMS x 4 at 4 ohms, and up to 125 watts RMS x 4 at 2 ohms. It also supports bridged output, rated at 250 watts x 2 at 4 ohms. In plain terms, it is positioned for owners who want meaningful volume and control without dedicating much space to amplification.
Bluetooth built in, no extra receiver required
The built-in Bluetooth feature is geared toward simpler audio sources. If your goal is to stream music from a smartphone on a boat, utility vehicle, or in a small vehicle/trailer where you do not want to add another head unit, this can reduce wiring complexity.
Adjustable crossover filters for cleaner speaker matching
The amplifier includes variable high- and low-pass filters from 35 to 250 Hz, with a 12 dB/octave slope. That range and slope are useful when you are trying to better match speaker types (for example, separating what you send to component coax tweeters versus woofers, or dialing in subwoofer support in multi-amp plans).
Design and mounting for tight spaces
With a listed item weight of 2.1 pounds and small dimensions, it is easier to fit than larger Class AB multi-channel options. The chassis is described as a silver unit that can use switchable black or white top plates, which can help it blend into different install aesthetics.
Pros and cons (bottom-line take)
When this amplifier is a smart buy
- You need a compact 4-channel amp for a marine, ATV, motorcycle, trailer, or classic car build where space is tight.
- You want to stream audio directly via Bluetooth and reduce reliance on an external receiver.
- You value adjustable crossovers (35-250 Hz, 12 dB/octave) to dial in speaker response.
When you should look elsewhere
- You are not comfortable double-checking wiring details, especially around any remote input/output connections.
- You need proof of consistent long-term reliability beyond what review evidence currently supports, or you want a model with a more robust pattern of after-install feedback.
Installation considerations and compatibility checklist
- Speaker impedance and channel loading: Match your speaker setup to the amp’s published power-at-impedance ratings (4 ohm and 2 ohm considerations for x4 channel use, and bridged operation ratings).
- Source and Bluetooth expectations: Bluetooth can simplify setup, but Bluetooth behavior can vary by phone and environment. If you require features like hands-free calling, Bluetooth audio support alone may not be sufficient for your needs.
- Crossover settings: Use the filter frequency range (35-250 Hz) and slope (12 dB/octave) to avoid sending too much low-end to speakers not meant to handle it.
- Remote wiring: If your installation plan involves a remote turn-on or remote features, take time to confirm the correct remote wire orientation before powering on.
Is it worth it? A practical verdict
The Soundstream ST4.1000DB is worth considering if you want a small-footprint 4-channel marine-oriented amplifier with built-in Bluetooth and useful crossover control. The product is positioned for hobbyists and owners upgrading tight installs, and buyer feedback leans toward strong perceived power and clear sound. The biggest purchase caveat is that setup and wiring details matter, with some reports of remote lead confusion and a small number of out-of-box defect experiences. If you are ready to verify wiring carefully and test the unit early in your install timeline, this model can be a practical way to add real amplification without taking over your available space.
Price and availability
Current pricing and stock status can change quickly. Check the latest listing details to confirm availability and any bundle components included with your order.
FAQ
What is the output power of the Soundstream ST4.1000DB?
It is rated for 90 watts RMS x 4 at 4 ohms, and 125 watts RMS x 4 at 2 ohms. It also has bridged output rated at 250 watts x 2 at 4 ohms.
Does this amplifier have Bluetooth?
Yes. It includes built-in Bluetooth so you can stream music from a smartphone or other mobile device without needing a separate receiver.
What crossover settings does it support?
It offers variable high-pass and low-pass filters with a range of 35 to 250 Hz and a 12 dB/octave slope.
Where is this amplifier typically used?
It is designed for marine applications but buyers also use it for other space-limited setups like motorcycles, ATVs, trailers, and classic cars.
Is it difficult to install?
It is compact and straightforward for experienced installers, but some reports highlight the importance of correct remote wiring orientation if your setup uses remote turn-on or related connections.
What kind of buyer is this best for?
This is best for shoppers who want a compact 4-channel amp with Bluetooth and adjustable filters to power component/coax setups in small or non-traditional vehicles.
Specifications
| Product Title | Soundstream ST4.1000DB ST4.10000DB Stealth Series 1000W Class D 4-Channel Amplifier |
|---|---|
| Category | Electronics > Car & Vehicle Electronics > Marine Electronics > Marine Amplifiers |
| Brand | Soundstream |
| Manufacturer | Soundstream |
| Item Weight | 2.1 Pounds |
| Voltage | 12 Volts |
| Mounting Type | Freestanding |
| Number of Channels | 4 |
| Output Power | 125 Watts |
| Package Type Name | carton |
| Maximum Output Power | 1000 Watts |
| Item Dimensions | 7.5 x 3.88 x 1.5 inches |
| Material Type | Aluminum Alloy, PCB |
| Specification Met | FCC |
| Model | ST4.1000DB |
| Brand Name | Soundstream |
| Warranty Description | 1 year |
| Global Trade Identification Number | 00709483051034 |
| UPC | 709483051034 |
| Part Number | ST4.1000DB |
| Item Type Name | marine amplifier |
| Included Components | Amplifier^Manual |
| Unit Count | 1.0 Count |
| Item dimensions L x W x H | 7.5 x 3.88 x 1.5 inches |
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