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Alesis RA150

Item ID: RA150

2 x 75W at 4 Ohms, 2 x 45W at 8 Ohms, Stereo Studio Reference Amplifier with Advanced Convection Cooling System

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From Our Research Team:

Serious Studio Bang for Not-so-serious Buck!

Choosing the Alesis RA150 class AB reference amplifier for your studio is choosing quiet, efficient, and cool-operating power. Ready to stand up to the most professional of studio needs, the affordable 2RU Alesis RA150 reference amplifier sports advanced convection cooling, which delivers exceptional heat dissipation — without the noise of fan-cooling. There are also RCA and 1/4" TRS inputs, so you can power whatever you need — your studio monitors, your headphones system, or home theater — with the Alesis RA150.

Alesis RA150 Class AB Reference Amplifier at a Glance:
  • Delivers quiet, efficient, and cool-operating power
  • Outstanding heat dissipation — devoid of the noise of fan-cooling
  • Offers you great performance, at an excellent cost-per-watt value

Delivers quiet, efficient, and cool-operating power
The Alesis RA150 class AB power amplifier — a member of Alesis's RA "Reference Amplifier" series — brings quiet, efficient, and cool-operating power to any demanding studio environment. Plus, it's stylishly designed and attractively priced, to give you a surprising value. The RA140 power amplifier offers 75W RMS at 4 ohms per channel, 45W RMS at 8 ohms per channel, and 150W RMS at 8 ohms bridged.

Outstanding heat dissipation — devoid of the noise of fan-cooling
Purpose-designed for studio use, the RA150 reference amplifier features advanced convection cooling. This system delivers outstanding heat dissipation, for long, stable operation — unaffected by typical heat-related complications, and devoid of the noise of fan cooling. The Alesis RA150 is perfect for the studio environment.

Offers you great performance, at an excellent cost-per-watt value
Whether you need to power your studio monitors, your home theater, or your headphones system, you can count on the Alesis RA150. This reference amplifier is a true performer, giving you a lot of wattage for its reasonable price.

Alesis RA150 Class AB Reference Amplifier Features:
  • Class AB power amplifier, designed for use in studios
  • Dissipates heat through advanced convection, so there's no fan noise
  • Features easy-to-access, front-panel volume controls
  • Delivers serious bang for the buck from a cost-per-watt standpoint

Alesis RA150 Class AB Power Amplifier Specifications:
  • 4 ohms, per channel: 75W RMS
  • 8 ohms, per channel: 45W RMS
  • 8 ohms, bridged: 150W RMS
  • Inputs: RCA, 1/4" TRS
  • Signal-to-noise Ratio: >105dB, 22Hz-22kHz bandwidth referenced to rated output
  • Frequency Response: 10Hz-70kHz, +0, -3dB
  • Damping Factor: 200
  • Input Sensitivity: +4dBU (1.23 V) for rated output with input control at maximum
  • Maximum Input Level: +26dBu
  • Input Impedance: 20 k-ohms, balanced, 10 k-ohms unbalanced
  • Crosstalk: -85dB, 1kHz
  • Output offset: +/- 50mV, Servo controlled
  • 2 RU (Rack Units)
  • Weight: 15 lbs.

The Alesis RA150 is purpose-designed for the studio — and gives you a lot of bang for the buck!

RA150 Image Gallery

Specification Detail
Number of Channels 2
Watts/Side @ 8 ohms 45W RMS
Watts/Side @ 4 ohms 75W RMS
Watts Bridged 150W RMS @ 8 ohms
Cooling System Convection Cooled
DSP No
Filters No
Inputs 2 x 1/4" (Balanced), 2 x RCA
Outputs 2 x Binding Posts
Rack Spaces 2U
Height 3.5"
Depth 10.25"
Width 19"
Weight 15 lbs.
Manufacturer Part Number RA150

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Reviews

based on 7 reviews

Alesis RA150

by Ron Fields from Schaumburg, IL
October 6, 2011
Music Background: Bassist, keyboards, Trumpeter,Vocalist,and songwriter
excellent fidelity through my 11 year ole Event20/20's should's bought this YEARS ago!! Clean crisp Exact!!

It is just what I was looking for!

by Keith Pierce from Louisville, KY USA
May 1, 2012
Music Background: Pro Musician and Teacher
I have a Baldwin church organ in my home and I have been wanting to update the instrument, so I called Sweetwater and talked with Phil
Schwan about what I wanted to do and he was extremely help... read more [+]ful. I
had 3 sets of Conn pipes (these pipes were made for Conn Organs and they are out of business) Phil suggested that I purchase Alesis RA150 to send the organ sounds to the Conn pipes and they sound great. close [-]

Excellent no frills reference amp.

by Kip from New City, NY
October 24, 2008
Music Background: songwriter / engineer
Bought this as a replacement for my old dying RA100, and I'm glad to have made the upgrade. Balanced inputs are a nice feature, sound is great, and plenty of volume. Absolutely silent, both physical... read more [+]ly and operationally. I'm driving a pair of Alesis Monitor One Mk2 monitors. Not that I find this stuff important, but the lighting on this unit is great. You have to see it to fully appreciate it. It sort of pulsates in intensity to the amount of signal that's getting pushed through it. It's useful AND pleasing to look at, but subtle enough that it's not distracting either. For the price of this unit, you can't go wrong if you're looking to drive some un-powered monitors in a small to mid size project studio. close [-]

Good amp..

by www.beatbanga77.com from NJ
November 2, 2011
Music Background: Gospel, Hip Hop, RNB, anything you need..
I bought this simply because I needed clean quiet power for my old Event 20/20's. My QSC had too much power and a fan that I got sick of hearing. Im surprised by how good my 20/20's sound. I have not ... read more [+]heard them in a while and until I decide on what active monitors to purchase this will do fine! Im thinking focal (csm or solo models), vs Adam vs the Neuman monitors.. Ill take some tips if any of you have used them... close [-]

Same story

by from WI
November 22, 2010
Music Background: writer/producer
Same story as the previous reviewers. My Alesis worked very well in the studio, as long as it sat untouched, which was easy enough as a writer. As soon as I started using volume pots when working wi... read more [+]th live recording, the noise and static kicked in. Tried cleaning contacts, replaced one pot, still noisy and cuts out. Only cure is to wiggle the knobs until the sound is loud and clear, then leave it untouched. I loved the clarity (for the money) with this amp paired with KRK Kroc's, but I've about had it with the fidgity pots. Looking elsewhere. close [-]
Read more reviews

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See Also: Monitor Amps , Alesis , Alesis Monitor Amplifiers , Alesis 2-Channel Amplifiers

Alesis RA150

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