Question about Sherwood RX-4105 Receiver

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Sherwood rx4105 At higher volumes the receiver cuts out............... the speakers can handle the load.......usually around 42 on vol. dial goes up to 60............... is it not getting enough air flow? Scott

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  • Anonymous May 27, 2008

    Same problem when the volume goes over 36 the receiver clicks off.

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Can this amp drive 4 ohm spkrs


Posted on Mar 03, 2011

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Sherwood RX4105 needs a air cooling system if you planning on playing loud music for 4 hours or more on loud speakers. Sherwood RX-4105 has a thermal and current sensor that will shutdown the receiver if it exceed the temperature or the current. On my Sherwood RX-4105 receiver powering my loud speaker with 12 inch woofers, I put a 120 volt AC, 9 inch, 53 watt fan on top of my receiver that is capable of blowing over 100 CFM into top ventilation holes of my receiver, I was able to crank the volume up to 50, and I had my bass control set at -8 and my treble control set +2, and my Sherwood RX4105 receiver was able to play loud music on my loud speakers for 4 hours without the receiver shutting down. I cranked the volume to 52, then receiver shutdown. I tried to crank the bass up to -6, but my receiver shutdown too. With the volume cranked up to 50, my fan kept my receiver so cool, there was very little warmth from my receiver when I put my face to the flowing air from the bottom ventilation holes of my receiver. I hooked an oscilloscope to my speakers wires of my RX4105 receiver and I hooked up my receiver to 8 ohm dummy load. I cranked the volume up to max and I viewed the wave pattern on my oscilloscope, there is distortion in the wave pattern at max volume. Distortion can blow out a tweeter in the speaker that is something you want to avoid. There highest volume I can go with my Sherwood RX4105 receiver without distortion is 55 and my receiver still put out 100 watts of power into my 8 ohm dummy load.
From my experience with transistorize power amplifiers, both RF (radio frequency) and Audio, that is capable running 100 watts or more need a air cooling system. The just a aluminum heatsink is not enough. With a 100 watt amplifier, the heatsink will not get any cooler, it will keep getting hotter and hotter until it breaks down.

Big loudspeakers draw a lot current. You need a receiver that is capable of running speakers that have an impedance of 8 ohms o less, and with a air cooling system in order to power those big loudspeakers. Sherwood RX4105 receiver is only design to run speakers with a impedance 8 ohms or more.

Posted on Jun 08, 2008

  • Craig Morrow Jun 09, 2008

    If you want to keep running the Sherwood RX-4105 and crank the volume up to 55 or over, you would have to hook up 4 speakers to terminal A, hook the 2 speakers up in series, and then hook the 2 wires from the two speaker that are hooked up in series to each channel on the speaker terminal. Make sure on each channel the red wire is hooked up to the red + terminal of the receiver and the red + terminal of the speaker, the black wire from the black - terminal of speaker is hooked up to the red wire to the from the red + terminal from the other speaker, and the black wire from the black - terminal from the other speaker is hooked up to the black - terminal on the receiver. Do not hook up all four 8 ohm speakers on terminal A and B, you will not be able to crank the volume up any higher than running 2 speakers on the Sherwood RX4105 receiver, because the 2 speakers on each channel will be hooked up in parallel. And make sure you all 4 speakers are the same kind.



    I hooked my 2 Cerwin-Vega CLS-12 speakers in series on one channel, and then I cranked the volume to the max, the 2 Cerwin-Vega speakers on one channel performed better than one speaker one channel, and plus my Sherwood RX4105 receiver hooked 2 speakers in series on one channel runs cooler than one speaker on one channel, and my receiver did not shutdown, and plus I was able to turn the control bass up from -8 to -6 without the receiver shutting down. But when I ran one speaker on one channel, my Sherwood receiver shutdown after I cranked the volume over 50 with a fan on top of the receiver.



    I hooked an oscilloscope to the speaker wires with one speaker hooked up to one channel with fan on top of the receiver, and crank the volume up the 50, my Sherwood RX4105 receiver puts out 40 volts peak to peak on the oscilloscope screen without the receiver shutting down. But when I crank the volume over 50 with the receiver putting out over 40 volt peak to peak, the receiver shuts down. When I hooked up 2 speakers in series one channel and I cranked the volume up to max, my receiver puts over 80 volts peak to peak on the oscilloscope screen, and it did not shutdown. Plus there was distortion in the wave pattern on the oscilloscope screen. You can blow a tweeter in your speaker with distortion. I backed the volume down until the distortion disappears, my receiver puts out 80 volts peak to peak with volume set at 55. A 100 watt per channel receiver puts out 80 volts peak to peak, or 28.2 volts rms on a 8 ohm load.



    Therefore, that's best way to run a Sherwood RX4105 with the volume cranked up to max without the receiver shutting down by hooking 4 speakers with 2 speakers hooked up in series on each channel.

  • Craig Morrow Jul 04, 2008

    I did some more testing on my Sherwood RX-4105 measuring the voltage and the current to the speaker with my oscilloscope to see where the RX-4105 shutdown. The RX-4105 shutdowns at 2.8 amp rms at around 64 volts peak to peak or 22.6 volts rms about 64 watts with the volume set at 50. A 100 watts to an 8 ohm speaker puts out 28 volt rms or 80 volts peak to peak at 3.53 amps rms. The Sherwood RX-4105 will not shutdown on the 8 ohm dummy load with volume set at 56 without clipping. It only shutdown on when the speakers are hooked up. I hooked up my Technical Pro HB-2000 fan cool amplifier to my speakers, and it did not shutdown when I cranked the volume up to max without the amplifier clipping.



    My conclusion, Sherwood RX-4105 has a design flaw in their amplifier protection circuit. If you bought your Sherwood RX-4105 within 10 to 30 days ago, return it and get a refund, and get another receiver. You would be better off spending more money getting another receiver that can run your speakers without shutting down when the volume is cranked up to the max, and be able to run 8 ohms or 4 ohms speakers. I will never buy another Sherwood receiver again.

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I too have the same problem with my Sherwood RX4105 receiver shutting down whenever I turn the volume up near max to my Cerwin-Vega CLS-12 speakers. I hooked a 8 ohm dummy load to my Sherwood RX4105, and then I turned the volume up to near max, it did not shutdown. I hooked a clamp on current meter on my speaker wires, and I found out that my CLS-12 speakers was drawing more current than on the 8 ohm dummy. I hooked an audio generator to my RX4105 receiver, and went through audio frequencies on my Cerwin-Vega CLS-12 speakers with my clamp on current meter, and I found out that my 12 inch woofers was drawing more current below 240 Hertz, and it had impedance less than 8 ohms. What cause the Sherwood RX4105 receiver to shutdown whenever you turn the volume up is low impedance of the speakers on certain frequencies. Speakers is not always 8 ohms throughout the audio frequencies range. They can go lower or higher than 8 ohms impedance throughout audio frequencies. Low speaker impedance on 8 ohm speakers usually occur around the woofer frequency range. My Sherwood RX4105 will not shutdown cranking the volume up if the speaker impedance 8 ohms or higher. Sherwood RX4105 will shutdown if the speaker impedance is less than 8 ohms. The low ohmage from the speakers will get the receiver hot and then eventually will shutdown. I had to turn the bass control down on the Sherwood RX4105 receiver in order to keep it from shutting down. I also tried hooking my speakers up in series to double the impedance on one audio channel on my Sherwood RX4105, and cranked volume up to near max, and my receiver did not shutdown, and it was just as loud as one speaker on one audio channel. But when I hooked just one speaker up on one audio channel, and I cranked the volume up to near max, my Sherwood RX4105 shutdown.

I am planning getting an receiver than can handle speakers with an impedance 2 to 8 ohms. Receiver that is capable of low impedance speakers delivers high current to the speakers. But I still would need an equalizer to cut back some of the audio on certain frequencies that run on low impedance because you can blow out woofer or blow out the fuse on the woofer if I crank the volume up on a high current amplifier.

Posted on Jun 05, 2008

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  • craigwcg Jun 24, 2009

    Sherwood RX-4105 is designed to handle speaker impedance of 8 ohms or more. The reason why the Sherwood shutdown when you crank up the volume, because the speaker is has some low impedance on certain frequencies less than 6 ohms in which that would overload the receiver, and then receiver would shut down. There are one of the two things that you could either do, you would either need to find speakers that are already on the market that have an impedance compensation network that would maintain near 8 ohms impedance throughout the audio frequencies in which that would be expensive due to the time consumption into designing it, or you could either find a high current receiver or amplifier that is capable of handling speaker impedance of 8ohms or less. I had to order some speaker crossover parts to build my own external in-line impedance compensation network for my speakers in order to make them campatible to my Sherwood receiver. And now, I can crank up the volume up to 55, and my receiver had never shutdown every since I have that external speaker impedance compensation network in-line. My Sherwood receiver runs cooler than it did before with that external impedance compensation network in-line also. But I still had to put a 10 inch 55 watt fan on top of my Sherwood receiver in order to keep it cool while I playing loud music for 4 continuous hours with the volume set at 55. In a 117 square foot room running my Sherwood RX-4105 with the volume cranked up to 55 into my 2 speakers that have 12 inch woofer, 6.5 inch mid-range, and 1 inch dome tweeter with the external in-line speaker impedance compensation network is just like being in an 8000 square foot nightclub with 20000 watt sound system. My ears gets sore with earplugs on after playing 4 continuous hours of loud music. Not all speakers have the same characteristics. The speaker impedance compensation network has to be designed and built accordingly to speaker's characteristics. If you have electronic engineering background, you could build that external in-line speaker impedance compensation network for your speakers yourself, and that would cost around $120 in parts in order to build it for 2 speakers depending speaker's characteristics.

  • craigwcg Aug 20, 2009

    I just bought a sound pressure level meter to check my Sherwood RX-4105 hooked up to my 2 speakers with 12 inch woofers with my external speaker impedance compensation network inline with the volume control on my Sherwood cranked up to 56, my speakers are pounding my 117 square foot room with 124 decibels at of sound pressure level at C weighting in which that is equivalent in being in a concert, or in a 8000 square foot nightclub with a 20,000 watt sound system, and my Sherwood RX-4105 in drawing 2.5 amps of current from the 120 volt AC wall outlet. Without my external speaker impedance compensation network inline, with my Sherwood hooked up directly to my speakers with the shutdown system in my Sherwood receiver temporarily disabled with the volume cranked up to 56, my Sherwood receiver draws 3.5 amps from the 120 volt AC wall outlet, and my speakers are putting out 120 decibels, and then I re-enable the shutdown system in my Sherwood receiver, and my Sherwood receiver hooked up directly to my speakers, and then cranked up the volume to 56 on my receiver, my Sherwood receiver shutdowns immediately. Speakers need an impedance compensation network in order to work with that Sherwood receiver, otherwise that Sherwood receiver would shutdown or breakdown.

  • craigwcg Dec 05, 2009





    In order to get my Sherwood RX-4105 to work on my speakers with the volume cranked up to 56 with the bass and treble control set at 0db or tone direct, I had to fix the low impedance problem on my speaker by building me an external parallel LCR impedance compensation network hooked up in series on the positive wire of the speaker line between the audio amplifier and the speaker. The external parallel LCR network is precisely tune on the audio frequency that have the lowest impedance curve, and it raises the speaker's low impedance curve to 7 to 8 ohms, and it provides equalization. In order to set this parallel LCR network up, you need some test equipment, and some electronic background. It would be very difficult set up without electronic knowledge. Some speaker designers use that parallel LCR network in their speaker designs, and you can find it in some speaker designing books. Most speaker manufacture will not use that network because they don't have extra time and money to build it and put it in their speakers.



    So if your Sherwood RX-4105 receiver shuts down after you have cranked up the volume to 56 with the bass and treble control to 0db, have a technician to check your speaker's impedance to see if it is above 6 ohms throughout the audio frequency. Right now, I can crank up the volume on my Sherwood receiver to 56 pounding my room with 128db for 6 hours after I ran 12 gauge speaker wires, and my receiver has never shutdown, nor blow out any fuses on my speakers every since I have that external LCR impedance compensation network inline.

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You may be using an equalizer? try to pop-up the volume with all tone controls in flat mode. see if it still cuts off. if this is the first time youencounter this then something must be wroing with either your speakers or your amp. unless your ventilation is not good enoughg, you can also try placing a blower on top of your unit to cool it down

Posted on May 04, 2008

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