SWR SM400-0223-U Rack Mount Tube Preamp Bass Amplifier SM-400

( Brand: Swr ), ( Manufacturer Part Number: SM400-0223-U ), ( Custom Label: Swr-sm400-0223-u ), ( Type: 38072 )

Review SWR Rack Mount 400 Watt Tube Preamp Bass Amplifier

The SWR SM400-0223-U SM-400 Rack Mount 400 Tube Preamp Bass Amplifier is a powerful and versatile piece of equipment designed for professional musicians and audio engineers. This amplifier is a true class A design, which means that each tube operates in its purest form, delivering an authentic and rich tone that is unmatched by solid-state amplifiers.

The SM-400 features four 6550 output tubes, capable of delivering 400 watts RMS into 4 ohms, ensuring that it can handle even the most demanding bass applications. The amplifier's preamp section includes six 12AX7A tubes, which provide a wide range of tone shaping capabilities. The front panel is equipped with a three-band active equalizer, allowing for precise adjustments to bass, mid, and treble frequencies.

The SM-400 is also equipped with a versatile input section, which includes both XLR and 1/4" inputs, making it suitable for use with both active and passive basses. The amplifier also includes a ground lift switch, which helps to eliminate unwanted noise caused by ground loops.

The amplifier's rack mount design makes it easy to integrate into any professional audio setup. It features removable rack ears, allowing it to be mounted securely in standard 19" racks. The front and rear panels are made of heavy-duty steel, ensuring that the amplifier can withstand the rigors of live performances and studio use.

The SM-400 also includes several convenient features, such as a standby switch, which allows the amplifier to be powered down while still keeping the tubes warm, making for quicker warm-up times. It also includes a separate speaker output for use with external speakers, as well as a headphone output for quiet practice sessions.

In summary, the SWR SM400-0223-U SM-400 Rack Mount 400 Tube Preamp Bass Amplifier is a high-performance and versatile piece of equipment that is perfect for professional musicians and audio engineers. Its authentic tube tone, powerful output, and versatile input section make it a must-have for any serious bass player. Its rack mount design and durable construction ensure that it can withstand the rigors of live performances and studio use, while its convenient features make it easy to use in a variety of settings.

The SWR SM400-0223-U SM-400 Rack Mount 400 Tube Preamp Bass Amplifier is a popular choice among professional bass players due to its high-quality tube preamp and versatile features. Below are the pros and cons of buying this amplifier:

1. Tube Preamp: The SM-400's tube preamp provides a warm and natural sound that is preferred by many bass players.

2. Versatile: This amplifier can be used with both active and passive basses, and it offers multiple input options, including XLR and 1/4" jacks.

3. Powerful: With 400 watts RMS of power, this amplifier can deliver the necessary volume and headroom for most live performances and studio recordings.

4. EQ: The SM-400 comes with a 3-band EQ that allows for precise tonal shaping.

5. Compatible with various speaker cabinets: This amplifier can be used with various speaker cabinets, allowing for different tonal options.

1. Size and Weight: The SM-400 is a rack-mount amplifier, which means it requires additional space and weight to transport and set up.

2. Price: This amplifier is priced higher than some other options in the market, making it a significant investment for some bass players.

3. No Built-in Speaker: This amplifier does not come with a built-in speaker, which means you will need to purchase a separate cabinet to use it.

The SWR SM400-0223-U SM-400 Rack Mount 400 Tube Preamp Bass Amplifier offers a warm, natural sound and versatile features that make it an excellent choice for professional bass players. Its powerful output and compatibility with various speaker cabinets make it a versatile option for live performances and studio recordings. However, its size, weight, and high price tag may be a significant consideration for some players. Ultimately, if you are looking for a high-quality tube bass amplifier with plenty of power and versatility, the SM-400 is an excellent choice.

If you are a professional bass player looking for a high-quality tube preamp bass amplifier with plenty of power and versatility, the SWR SM400-0223-U SM-400 Rack Mount 400 Tube Preamp Bass Amplifier is an excellent choice. However, if you are on a tighter budget or prefer a more portable option, you may want to consider other options in the market. Ultimately, it is essential to consider your specific needs and preferences when choosing a bass amplifier.

Details:

Some smaller items may ship via USPS. This amplifier is in very good condition with some small scratches on its face place. Visa, Master Card, American Express, Discover. It has an all-tube pre-amp section fitted with 12AX7's, and two solid state power amps for the ability to run amplifier as a bi-amp configuration.

It can run at 400 watts 8 ohms, and 440 4 ohms. For current delivery schedules, service availability and information, a of the UPS Guarantee, see Rate Service Guide. Yes, Preamp Tubes 12AX7, Power Tube Con fig Solid State Amp, Master Volume. Yes, Foot switch Not Capable.

Super Fast Same Day Shipping. Specifications, Brand SWR, model SW-4 Serial 1224873, Wattage 4 Amplifier Type Hybrid, Speaker Configuration None, Head/combo/cabinet Head, Channels 1, Fox Loop.

part #: sm4000223 prices

• $389.99-$494.99

specifications guitoamps:

• brand: Swr
• mpn: Sm400-0223-u
• custom label: Swr-sm400-0223-u
• type: 38072

general guitoamps:

• condition: Used
• Musical Instruments Gear > Guitars Basses > Guitar Amplifiers

returns guitoamps:

• policy: Returns Accepted
• time: 30 Days
• method: Money back
• paid by: Buyer

shipping guitoamps:

• type: Fixed
• class: Standard
• transit: 4-7 Days
• service: Standard
• cost: $45.00

offer guitoamps:

• availability: In Stock
• started: February 26, 2026
• options: Ship-to-home
• best offers: True
• quantity: 1
• sold: 0

payments guitoamps:

• credit card: Visa
• wallet: Apple-pay
• other

seller guitoamps:

• city: Buffalo, New York
• rating: 100.0%
• # reviews: 28641

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