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2 Channel Amplifier - 300 Watts - NO LOGO
Get large amounts of incredibly clean power for a stereo speaker zone in a multi-zone home audio system using this 2-Channel, 300-Watt amplifier from Monoprice!
This stereo amplifier puts out 150-watts per channel into 8-ohms with only 0.2% Total Harmonic Distortion plus Noise (THD+N)! When bridged into mono mode, it can deliver up to 470-watts into an 8-ohm load, with the same 0.2% THD+N, making it well suited for high power applications. It also boasts a -103dB signal-to-noise (S/N) ratio at the full rated power into a 4-ohm load. It also features > 65db crosstalk at the rated power into an 8-ohm load.
The amplifier has two stereo inputs with automatic switching, both of which support either line or speaker level input. The secondary input is intended for normal use with the primary input off. Then, whenever the primary input is active, it will override the secondary input. Additionally, it features a line level secondary output, which passes the secondary signal on to another amplifier or line level device.
The amplifier supports a 12 volt DC trigger for turning the amplifier on/off and a 12 volt DC trigger output to control other devices, such as a projection screen or curtains.
The volume control on the front panel is a volume attenuator more than a direct volume control. When setting up the amplifier, you set the maximum volume level using controls on the back panel, then you use the front panel attenuator to control how much of the preset volume is used.
Note that if the master volume level is set too high, the front panel attenuator will be unable to completely attenuate the output volume.
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Specifications |
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Power Output |
150 watts per channel into 8 ohm loads with less than 0.2% THD+N
235 watts per channel into 4 ohm loads with less than 0.2% THD+N
470 watts Bridged Mono into 8 ohms with less than 0.2% THD+N |
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Crosstalk |
>65dB@1kHz, ref. to rated power into 8 ohms |
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Frequency Response |
20Hz to 20kHz, +0.0dB, -0.5dB |
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Signal to Noise Ratio |
-103dB ref. to rated power into 4 ohms AC |
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Power Consumption |
1200 watts (all channels driven) |
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Net Weight |
28.7 lbs (13.0 kg) |
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Gross Weight |
36.6 lbs (16.6 kg) |
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AC Line Fuse |
115VAC, 60Hz: T10AL, 250V
230VAC, 50Hz: T5AL, 250V |
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| All Customer Reviews - Click here to review for 2 Channel Amplifier - 300 Watts - NO LOGO. |
Average User Satisfaction Rate
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 | | Rating:  (10 out of 10) | Reviewer: Anonymous from Fort Collins, CO | 3/25/2016 5:05:13 PM |
| | Excellant for the price |  Pros: Cost, ease of use, performance
Cons: None yet.
Setup was easy except I had to turn up the volume controls on the back of the amp to get it to play. Now works flawlessly. Using it to run 2 very high end Tannoy definition ceiling speakers and they sound great.
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| | | Rating: (10 out of 10) | Reviewer: Ron T from Irvine, CA | 3/14/2016 8:40:58 AM |
| | Works as expected | Pros: Same size, power and functionality as an Altec Lansing 9442A (and similar models). It has two inputs for a normal line-in and a microphone override, takes Line In and Speaker In input levels, has stereo & bridge modes. It's a good & simple commercial audio amp.
Cons: Needs to offer rack mounts
I had an existing church PA system made up very old Altec Lansing 9442A's that have begun to fail. They are integrated into a rack and control multiple zones within the church and have 150W per channel in the stereo mode. When we discovered their failure, our best hope was to scour the internet for used units of the same model so we did not need to redesign the entire system with all new equipment. This strategy worked and we bought 5 at $200 each and a boatload to ship them. It was plug-n-play. BUT, they did not last even a year. Not surprising because they are all over 20 years old and have been out of production! Then I found this Monoprice No Logo 300W amp (150w/ch). It is an almost exact replacement for the Altec Lansing 9442A to the power, the stereo/bridge and almost to the size. It fits into our rack and only the input connections needed to change from a lug to an RCA (simple). Calibration was also rather simple. If you want to replace a similar rack-mounted amp with this one, set up is easy but you need to order a rack shelf, since this model is not suited for rack mounting (without some conversion kit that I did not see available). We are happy and with the $259.00 price tag is a lot better than buying and shipping a 25 year old unwarranted unit on E-Bay (less with a sale). Don't forget the rack shelf if you're installing this unit into a rack mount.
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| | | Rating: (10 out of 10) | Reviewer: Rao from Santa Clara, CA | 12/30/2015 8:24:46 AM |
| | Wow! | Pros: Plenty of power.
Product was packaged in double box. Excellent packaging.
Cons: For this price .. you should disable Cons section.
Wow !
Excellent amplifier. My Magnepan MMGs are singing nicely with this amp.
Don't be fooled by the price. This is ultra premium amplifier.
One question to Monoprice - How are you able to give such an excellent product for incredible price ? ( paid $208 ).
Thank you ! Thank you !
Note to Monoprice:
Product manual says - when amp is on with active signal amp front light will glow "BLUE" and when its stand by "RED".
But I see when the amp is on with signal it glows "RED" and when it sand by "Orange". I hope it's a mistake in the manual.
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| | Rating:  (8 out of 10) | Reviewer: Drew from New Holland, PA | 10/1/2014 2:05:02 PM |
| | Good Power/$, Ditch the Auto Input Sense Function | Pros: Power per dollar
Cons: Auto Input switching does not have adjustable input threshold, only time deadband control
I'm using this amp, paired with a Denon AVR-3313CI, to drive two 10" sealed sub-woofers.
Driving the subs (stereo mode), it has plenty of power to keep up with the AVR-3313CI, and in fact requires a -12dB gain factor using the Denon's auto setup functions.
So far, so good. Does not hum or do anything strange. I've given it 8 out of 10 because the manual is scant on details, for example has no diagrams, and the explanation between what is labeled "Primary" and "Secondary" inputs is confusing.
The "Secondary" input is actually the primary, normal input, and the "Primary" input is actually the secondary input that becomes primary when there's an input signal present. Got that? Lol, I'd ditch the auto sensing feature all together, the switching threshold is non-adjustable except for time-delay pot on the back that allows you to adjust the deadband delay on how quickly it will function, but not the level at which the switch occurs. Adding a user selectable input select front panel input, or provisions for an external dry contact or trigger control would be better IMO.
Thinking the automatic input select feature would work, I tried the "Primary" input first, as it's labeled "Primary". Using that "Primary" input only, at lower volumes, the amp continuously toggled, swapping between inputs. Using only the "Secondary" input solved that problem. That said, this amp wouldn't be reliable to use in a true two input configuration at lower volumes for sub duty (have not tried full range usage). It doesn't matter for me because I'm using it only as a single input sub amp.
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(95%)
rated by 4 user(s)