"Great performing receiver for the low price"4.5 starson by craigwcg287
Pros: Great performing receiver with low distortion and low cost.
Cons: Make sure your 8 ohm speakers can maintain the actual impedance above 6 ohms when the volume is cranked above 40, or else, the receiver will go into pretcction mode and shutdown, and it needs a fan on top of receiver blowing into the vent holes.
Summary: The Sherwood RX-4105 is a great performing receiver for under a $100. I put my oscilloscope on my Sherwood receiver, this receiver audio output waveform is clean and not distorted throughout audio frequency from 20 to 20,000 Hertz at 110 watt per channel audio output, and the audio output reproduces the same waveform as the line level inputs with linearity.Correction instead of 65.55 degrees F, it's 65.55 degrees Celcius
But if you buy this receiver, make sure your 8 ohm speaker's lowest impedance is above 6 ohms throughout the audio frequency from 20 to 20,000 Hertz, or else your Sherwood receiver would shutdown as soon as you crank up the volume pass 40. If you can crank up the volume on the Sherwood receiver at 56 on FM tuner mode with the tone control set at Tone Direct, or the bass and treble control set at 0db into your 8 ohm speakers without the receiver shutting down by protection mode, then you 8 ohms speakers are OK with that Sherwood receiver, or if your Sherwood receiver shuts down, then have a qualified reputable technician to check your 8 ohm speaker?s lowest impedance. If your 8 ohm speaker?s lowest impedance is below 6 ohms, the speaker?s impedance can corrected internally or externally in order to get it above 6 ohms.
That?s what happened to my Sherwood receiver. It kept shutting down as soon as I cranked the volume pass 40 into my pair of 8 ohm 3 way speakers with 12 inch (30 cm) woofer, 6.5 inch (16.5 cm) waveguided midrange, and 1 inch (25 mm) waveguided dome tweeter that are rated at 300 watt peak or 150 watt rms. I used my oscilloscope, audio generator, and frequency counter to measure my speaker?s lowest impedance, and I found out that my 8 ohm speaker?s lowest impedance is 2.8 ohms at around the frequency of 85 Hertz, and that?s what caused my Sherwood to shutdown. I ordered some speaker crossover parts, and then I built me an external speaker impedance compensation network that corrected my 8 ohm speaker?s low impedance problem by keeping my 8 ohm speaker?s lowest impedance above 6 ohms throughout the audio frequency between 20 to 20,000 Hertz, and it also provides better equalization in sound levels.
Now I can crank up the volume at 56 with tone control set at Tone Direct on my Sherwood receiver putting out 110 watts per channel of audio output pounding my 117 square foot (10.87 sq. m) room with 128 decibels of sound pressure level (SPL) for 6 continuous hours, and my Sherwood receiver never did shutdown. 128 decibels in a 117 square foot room is an equivalent of being in a 8000 square foot (743.2 sq. m) nightclub with a 20,000 watt sound system, and it can make your ears sore with those spongy earplugs on.
I?m also running 12 feet (3.66 m) of 12 gauge speaker wire between my Sherwood receiver and my speakers. If you run speaker wires over 10 feet (3.05 m) between your 100 watt per channel receiver and your speakers, use 12 gauge speaker wire, otherwise, you would lose 2 to 3 decibels of SPL in the room, especially the audio frequencies above 10,000 Hertz. Also I?m running a 10 inch (254 mm) 55 watt AC fan on top of my Sherwood receiver blowing into the vent holes to keep my receiver cool while I have the volume cranked up to 56 for 6 continuous hours. That 10 inch 55 watt AC fan blowing into the vent holes on top of my Sherwood receiver will keep the heatsink temperature under 100 degrees Fahrenheit or 37.77 degrees Celsius with the volume cranked up to 56 for 6 continuous hour. Without that fan with the volume control set at 56, the Sherwood receiver?s heatsink temperature would climb as high as 150 degrees Fahrenheit or 65.55 degrees Celsius or higher, and that?s too hot to touch, and then the receiver?s audio output power transistors would fail. Also plug your Sherwood RX-4105 receiver in a surge protector wall outlet, because that receiver has computerized parts on the front end, or else without the surge protected wall outlet, the receiver could damage by power surge..
After I?ve done all that, my Sherwood RX-4105 receiver performed excellently without any problems.
Updated on Jan 27, 2010
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