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Alesis RA150 Power Amp

45 watts RMS per channel at 8 ohms. 71 People rated this product:

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Manufacturer's Description for Alesis RA150 Power Amp

Three Powerful New Additions to Alesis' Already Popular RA Series
With their rugged construction, striking good looks - among the first examples of Alesis' groundbreaking new approach to industrial design and a long list of features, the new RA series will quickly find a home in project and commercial recording studios and broadcast and post-production control rooms around the world.

Popular Prices, Powerful Performance
Even with the increasing use of powered speakers, many popular speakers and headphones still require external amplification. These new amps are designed to provide more power and better performance at a lower overall cost per watt than even Alesis' own RA100 as well as any other competing models. As a result, they can more closely match the power needs of virtually any passive speaker or studio monitor, offering a significantly better fit for an exceptionally wide range of budgets, applications, and customers. And providing a crisp, clean signal for outstanding performance and extended speaker life.

Cool, Quiet Operation
Designed for studio use, each RA Series amp incorporates advanced convection cooling for heat dissipation. The result is long, stable operation unaffected by heat-related complications, without the added distraction and annoyance of fan cooling. And eliminating the danger of losing hard-to-hear details due to noisy amp performance.

The New Leaders in Affordable Studio Amplification
Three new RA Series amps RA150, RA300, and RA500 providing a bold and powerful answer to the question, "What's next from Alesis" Combined with the popular RA100, they offer a wide range of high-quality, popularly priced solutions for virtually any - and every - situation. zZounds is an authorized dealer of Alesis products.

Height: 2 RU

Rated output:
4 ohms: 75 watts RMS per channel
8 ohms: 45 watts RMS per channel
8 ohms: 150 watts RMS, bridged mode

Signal to Noise Ratio: >105dB

Frequency Response: 10Hz - 70kHz +0, -3dB

Distortion: < 0.02% @ 4ohms, 20Hz - 20kHz

Input Sensitivity: +4dB for rated output

Crosstalk: -85dB, 1kHz

Output offset: +/- 50 mV, Servo controlled

Inputs: 1/4 in. TRS and RCA

Outputs: 1/4 in. and push clip

Reference Manual

Alesis Warranty

Alesis Warranty

If you have additional warranty questions, please call the manufacturer at 401-658-5760

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Customer Reviews

4 out of 5 (71 ratings) Rate and Review This Product

Read all 7 Alesis RA150 Power Amp Reviews

"Studio Power Amplifier Genius!"

Sound: For what it is, I don't see how they could possibly make it sound better. It sounds as good as vintage BGW power amps, or newer power amps that I have tried on my Paradigm Atoms. Seems to really let the speakers do their thing. Good reference sound. Feature: As far as features, it is servo so it has good DC shortage protection...but most modern amps seem to have that. It does have a relay circuit to prevent speaker thumps and that's good. However, it could use some better signal leds, and maybe a little more click on the output detents...also more input and output options. But for what it is? Can't complain much. Ease of Use: If you can't get this to work right, you a) Shouldn't be operating a studio at all, b) Haven't read their manual at all, c) Probably don't even know what a power amp is, or why you need one, d) all of the above? Seriously, it doesn't get any easier. Quality: For studio use, you don't really need anything beefier. If you were going to be taking it on the road, I'd worry just a little about the plastic knobs and the plastic front. But if it was in a rack, it wouldn't be a big deal. Plus, knobs are replacable with an aftermarket knob. As for overall workhorse reliability, I kept it in the garage for about a year with wooddust floating around it and even got some wood shavings inside the casing...after spraying out the knobs with some CAIG deoxit (which was really easy to do because of their design) I plugged it in and it worked PERFECTLY. No scratchiness, no hiccup, no odd smells, no general weirdness. The wiring in them does seem to be first rate. Value: It's hard to go wrong for the price. I can't imagine wanting to buy a more expensive power amp unless you just wanted the image and status of owning a more expensive product. Manufacturer Support: Can't say anything to this. But I've always heard good things about Alesis's service. The Wow Factor: Comeon, who's going to lust after a power amp right? Really though, the non-fan heatsink is great. Also, the blue power light on the front is really hypnotizing. Alesis figured out the hidden secret of electronics; soft blue lights are always more enthralling than bright red or green. It's oddly reassuring, and really draws the eye. So for a basic poweramp, I'd say it has some sex appeal. Overall: I might test it next to some vintage poweramps just out of curiosity but I don't think I'll need to "upgrade" from this. It does what it does very well. If it broke, I might look around and see what products were on the market to replace it...but I imagine that when that happens Alesis will indeed have a new product line, as will everyone else. I just can't see this power amp giving up the ghost. I plan on using it to record and mix, and review other products at www.microphoneheaven.com for as long as it continues to work.

Style of Music: jazz, rock, brazilian, classical

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"Solid"

Sound: I use these with Alesis Monitor One MkII speakers. Nice and clean sound. Low noise floor. In my 14' x 14' room I don't even need to turn them half way up. Definitely enough power. Feature: Signal clipping. Signal delay on startup shutdown to prevent thumbs. Notched volume knobs. LEDs to indicate signal presence / clip. Everything I'd want, nice. Ease of Use: Super easy if you know what an amp is. Connect speakers, turn knobs, push big power button. Quality: Feels solid in every way. Value: Moderate value for the price. It's all I need though. The Wow Factor: I think the design looks too space aged. Could be more refined. The position, color of the knobs and LEDs makes it kind of look like a face. Overall: I'd replace it with another if it broke. If I was buying an amp for a friend's project studio, I'd buy this one.

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Read all 7 Alesis RA150 Power Amp Reviews

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Available on
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Need it now but short of cash? All we need is the first payment up front and the rest in easy monthly payments!

Fast approval.: We approve everyone, with very few exceptions, as long as we can verify your identity.
No interest. Ever.: It's just as if you paid the whole amount up front!
No paperwork. Nothing to track.: No application to mail or fax, no bills to pay. We automatically charge the payments to your credit card.

We'll wait on your money so you don't have to wait for your gear!

When you checkout, just click the Play as you Pay checkbox to indicate which installment plan you wish to use.

on most orders $49+

Just $2.99 on
smaller orders

Really heavy stuff might cost you a
little more

learn more

Why fight traffic and pushy salesmen when we'll bring your gear straight to your home, free of charge?

zZounds free shipping is really free!: No hidden charges or hassles on returns.
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