Alesis RA500 Stereo Power AmplifierThe Alesis RA500 is an excellent choice to either power studio monitors or for live gigs. The RA500 power amplifier works great to power near or medium field studio monitors as well as PA speakers. If you are mixing rap or rock music this is a good power amp. The Alesis RA series power amps are made for recording studios, broadcast and post-production rooms as well as serve as a power amp for small PA systems. The construction is somewhat more substantial than their previous power amps.
Alesis RA500 Power Amplifier Features
- XLR, 1/4 inch TRS and RCA inputs
- Speaker protection circuit
- High Quality Power Supply
- 3 rackspaces
- 250 Watts RMS per channel into 4 ohms
- 125 Watts RMS per channel into 8 ohms
- 500 Watts RMS bridged into 8 ohms
- Signal to noise >105dB
- 10Hz-70kHz frequency response
- Distortion of <0.02% at 4 ohms 20Hz-20kHz
- Fanless convection cooling
- Matches the power needs of most studio monitors
- A great amp in the studio or the P.A. rack.
The Alesis RA500 is a stereo (2 channel) power amp with 250 watts per channel at 4 ohms. It takes up 3 rack mount spaces in a 19 inch rack. The amp's rated output is 250 watts RMS per channel at 4 ohms, 125 watts RMS per channel at 8 ohms, and 500 watts RMS, bridged mode at 8 ohms
While supplies last, the RA500, the biggest amp in Alesis' reference-quality RA Series, is the least expensive model in the line. Don't miss this opportunity to own this fantastic studio/stage power amp.
The RA500 is convection-cooled with no fans. This is one of the reasons why the amp is great for recording studios, It's very quiet. It has a nominal frequency response of 10Hz-70 kHz but its power band is probably near 25Hz to 16 kHz. The specs say 22Hz to 22 kHz. Either one is great. Each channel of the RA500 has three types of inputs: XLR (balanced), 1/4 inch TRS, and RCA inputs. The TRS input can also accept a -10dB line level (guitar cable) so the TRS input accepts both balanced and unbalanced connections. There is also a line level RCA input (-10dB).
Alesis has beefed up the RA500's power supply by using a heavy-duty stacked steel IE laminated transformer along with the high power rectifiers and capacitors. The power supply is one of the most important components of a power amp. If it's underpowered then the amp will clip and not have very good low end frequency response.
With the addition of a DC servo circuit, the RA500 will remove any DC component from the output signal. Actually it removes it in its preamp stage. This is used to protect the speaker and output transistors from being overloaded and burned out. If the amp detects too much DC (short circuit) Alesis put in a relay that will disconnect the amp from the speaker. This circuit is also used to mute the outputs while the power supply's capacitors are charging so you don't get a
Thump.
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