Chapter 2: Connections

In recent years, expensive audiophile cables of high current capacity have appeared. These have been somewhat controversial; some feel the extra expense produces an audible improvement in sound quality, while others find no sonic difference between audiophile cables and other heavy-duty wiring. While Alesis does not endorse any particular brand of cable, we suggest that you investigate different cable types for yourself to discover if they improve the sound of your particular setup.

CONNECTING SPEAKER CABLES TO BINDING POSTS

The RA150/300/500 connectors are perfect for studio installations, especially near field monitor usage, where an effective and reliable connector is required. In addition, these connectors are very easy to set up in several different ways.

To connect speaker cable to the connectors:

1.Remove approximately 1/4" of insulation from the ends of the wires, being careful not to nick any of the strands.

2 . Twist the strands together. Unscrew the speaker terminals on the amplifier.

3. Feed the strands through the exposed hole in the binding posts, with the negative connected to the black terminal and the positive to the red terminal. Be careful that:

•The connector clamps down on the strands, not the insulation

•No stray strands contact any part of the chassis other than the connector.

4.Tighten down the binding posts and check that the wires can't be pulled out.

Tip: It may be easier to attach the speaker wires before the amplifier is mounted into a rack.

Using a banana plug:

Standard "dual banana plugs" (such as Pomona type MDP) should be used if the speaker cable will be removed from the amplifier often (for example, when used in a portable PA system).

In this case, simply:

1.Loosen the setscrews in the shaft of the plug until there is enough room to insert the wires in each side of the connector. (But be careful that the setscrew doesn't fall out.)

2.Remove approximately 1/4" of insulation from the ends of the wires, being careful not to nick any of the strands.

3.Determine the + and – conductors of the cable (by markings or moldings on the wire, or by the color of wire or insulation). Push the "-" side into the opening in the side of the connector marked "GND" or with a ridge sticking out the side.

4.Using a small screwdriver, tighten the setscrew against the wire.

5.Push the other "+" wire through the strain relief and into the other opening, and tighten it as well.

When plugging the banana plug into the amplifier, make sure that:

•The red and black wire nuts in the amplifier have been screwed down first.

•The side of the banana connector with the ridge or nub is plugged into the black connector.

Using a crimp-on connector:

If a crimp lug terminal is used on the speaker wire and the lug is too small to fit onto the threaded post, one leg of the terminal may be inserted in the hole in the post. As with wire connections, make certain that the terminal is snugly attached by tightening the plastic insulator nut.

RA150/300/500 Reference Manual

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Alesis RA150, RA300, RA500 manual Connecting Speaker Cables to Binding Posts, To connect speaker cable to the connectors
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RA150, RA500, RA300 specifications

The Alesis RA series of amplifiers—comprising the RA300, RA500, and RA150—have earned a respected spot in the audio equipment landscape, catering to both musicians and audio professionals. With a blend of innovative technology, robust performance, and user-friendly features, these amplifiers offer solutions for various sound requirements.

Starting with the RA300, this amplifier delivers a solid output of 150 watts per channel at 4 ohms, making it ideal for smaller studio setups or personal listening environments. It is built with a lightweight yet durable design, employing a modern Class AB architecture that ensures low distortion and high audio fidelity. The RA300 features comprehensive input options, including balanced XLR and quarter-inch TRS inputs, allowing seamless integration into diverse setups. Additionally, the built-in protection circuitry prevents overheating and damage during prolonged use, ensuring longevity and reliability.

The RA500 steps up the power and performance, presenting a robust 250 watts per channel at 4 ohms, making it suitable for larger venues and demanding applications. It utilizes advanced thermal management technology, which aids in efficient heat dissipation, ensuring the amplifier operates smoothly even under heavy load. The RA500 also boasts significant dynamic range and headroom, making it a preferred choice for professional environments where audio clarity and volume are paramount. The addition of a frequency response that spans from 20Hz to 20kHz means it can faithfully reproduce a wide range of audio frequencies.

Meanwhile, the RA150 serves as a versatile option for various applications, delivering 75 watts per channel at 4 ohms. Despite its compact size, the RA150 does not compromise on sound quality or functionality. Its Class AB amplifier technology results in enhanced audio accuracy, making it popular among beginner studios and educational settings. The straightforward controls and indicators ensure that users can quickly adjust settings for optimal performance.

All three amplifiers in the Alesis RA series share a common goal: to provide high-quality sound amplification without unnecessary complexity. Their combination of solid construction, advanced technologies, and thoughtful features make them suitable for a multitude of audio environments—from home studios to professional gigs. Whether you opt for the RA300, RA500, or RA150, you are investing in a reliable tool designed to deliver exceptional audio performance, catering to the needs of discerning audiophiles and professionals alike.
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