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Why to have input impedance very large an amplifier?????????

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  • Shahid Electronics
    Shahid Electronics May 11, 2010

    Good Question!

    I have no objection if amplifieres want low input impedence.


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You have to match input impedance to have a smooth transfer of power from one stage or component to the next, if the impedances dont match some of the power is reflected back and can damage the signal strength or even the equipment.

Posted on Jan 02, 2009

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My DCP501 has no phono input, only tape. How can I connect my turntable to DCP501?

The newer receiver amplifiers have not provided an input for the low voltage phono cartridge, a pre-amp is required that has the proper impedance to match up with the phono cartridges.

The attached photo is an example of one of many that are available sense the old vinyls are coming back.

Hope this helps?


Nov 11, 2016 | Motorola DCP-501 Receiver

1 Answer

Need manual can't get sound to my stereo have audio red and black wired to aux input on stereo

You should be able to download a manual from the manufacturer's website.

The aux input is generally high impedance and low sensitivity, needing more than one volt to obtain good volume. If your supply is in the order of a few millivolts, such as provided by a quality moving coil microphone or a magnetic record pick-up it is unlikely any sound will emerge from the loudspeakers.

Matching the source to the correct amplifier input is very important and once the choice has been made most amplifiers of my experience, that particular input must be selected at the controls of the preamplifier.

If the amplifier is only provided with an auxiliary input you might need an additional preamplifier to provide the correct matching of source to input sensitivity.

Jan 03, 2016 | Audio Players & Recorders

1 Answer

How do I connect Active speakers to my Denon 3805 AV receiver?

Your Genelec 1037C monitors are professional design with balanced inputs. Balanced inputs expect a low impedance signal with pin 1 earth, pin 2 hot and pin 3 cold. Because the Denon amplifier supplies a pre out for the front speakers (the first pair in the set of pre outs) at 1.2 volts and high impedance, you will need to convert the signal close to the amplifier with a stereo active DI box. Plug the pre out directly into the input of the DI with a SHORT lead and then plug two standard balanced microphone type cables ( XLR to XLR) into each of your active monitors. You cannot make a cable that is RCA to XLR by shorting pin 3 to earth to do this job properly. The inputs on your Genelecs expect a signal in the range -6dBU to +6dBU for rated output. A suitable DI box would be for example a Klark Teknik DN200. Hope that helps.
Cheers, Don.

Dec 06, 2014 | Denon AVR-3805 Receiver

1 Answer

How do i connect a sub wooferto my reciever

I own 2 of these Pioneer VSX-D903S units.

The only way to hook a powered subwoofer up to a VSX-D903S is if your subwoofer is equipped with amplified/speaker level terminals on the back, in addition to the line-level input. If you only have a line-level input, do not attempt to hook it up to this receiver.

If you're lucky, and have speaker-level inputs on your powered subwoofer, you would use the amplified terminals (connect to B-channel on the receiver). DO NOT connect anything to the line-level connection.

Alternatively, you could build two unpowered subwoofers, then set the receiver's Impedance switch to LOW, then connect one enclosure to each of the "B-channel" outputs. Connect your regular left and right speakers to their corresponding "A-channel" outputs. [Impedance range: 4 Ohm minimum, 16 Ohm Maximum]

Jul 20, 2012 | Pioneer VSX-D903S Receiver

1 Answer

Not powering on

To troubleshoot amplifiers when it's not starting up

check the base to base voltage of driver transistors might be too high.

Make sure that the amplifier's ground wire is tightly attached. If it doesn't look too good then take it out and clean it. Use a metal brush to clean that area.

Low power may cause your amplifier not to turn on. Make use of voltmeters to check if your amplifier is getting the right amount of power for it to work. Amplifiers need 110 volts or less to function if the power coming in does not reach that it means you have la defective power cable. If the power is alright and it reaches a minimum of 110 volts, and your amplifier still doesn't turn on that means that there is a problem with its power supply. Checking an inline fuse helps you to determine the appropriate amp ratings when you troubleshoot amplifiers. This is the best way to troubleshoot amplifiers with power problems.

To troubleshoot amplifiers that seems to be on standby mode

Look into your input sensitivity. An input control allows you to match output voltage that is coming from the main unit going to the amplifier then to the stereo speaker. The amplifier shuts down if the gains are
adjusted too high. This is simply because it overheats when it is set too high thus it automatically shuts off. When you troubleshoot amplifiers and this happens you will notice that the volume gets lower even if the setting is too high. Be aware of the optimal levels of the components when you troubleshoot amplifiers.

Your speaker's electrical impedance may also contribute as to why your amplifier may be turned on but doesn't seem to work. Impedance is the amount of current which flows with a specific voltage throughout the transistors, capacitors, etc. Just see to it that your amplifier and speakers equal in impedance range when you troubleshoot amplifiers. Use the voltmeter to check the impedance range when you troubleshoot amplifiers.

Take care..

Sep 14, 2011 | Audio Players & Recorders

1 Answer

Hi my name is Mike. I am a sales manager for a large chain of lease to own companies. I have a customer who says that the right speaker on his edison ed-8000k dual cd DJ system is not working. I have...


In its most basic form, a sound system consists of a signal, amplifier and speaker. If there is a problem with any of the three - unexpected results can occur.

Swap the speaker with a know good speaker. If it still doesn't work, it is not the speaker. Change the signal. This is usually done by selecting a different line level input, ir connecting a different device to the input(s). Your device may not have the ability to do this. If you are able to choose a different input, and the problem still exists, then it is probably not the input, either. That leaves an amplifier problem. The amp could have failed naturally, or due to an open or shorted speaker connection, connecting the wrong impedance value speakers, playing at a very loud level, etc. Some amps have a fuse or circuit breaker that opens in many of these situations - your may or may not have this feature. If it does, there's a chance it didn't open before the damage was done though. Needless to say, if you replace the fuse or it doesn't have one and the problem still exists, it will probably need to be sent out for professional repair.

I hope this helps and good luck. Please rate my reply - thanks!

Apr 21, 2011 | Audio Players & Recorders

1 Answer

Our 2nd zone won't work, we get the error saying check SP wires. The wires seem connected correctly. We also can't change the volume on zone 2. The Yamaha unit is working otherwise.


U cant get an amplified out put form ur av receiver for zone 2. speaker a A and B is the same out put of frond left and right. it is not ZONE 2 output. U can get only a pre output for zone to from this receiver. U nee a separate stereo amplifier for using zone 2 .put an amplifier in the other room, connect the zone 2 pre out to it. And do the following setup in ur av receiver .

The receiver shows check speaker cable because its amplifier minimum impedance is 8 ohms . when u connect other speaker in speaker the total impedance will come under 4 ohms. Speaker b is not ZONE 2 in this amplifier

1. press the input selector button A or B to select the source component you want to setup.

2. press and hold LEARN (on remote) button about 3 seconds by using a boll pen or similar object ( SETUP and the selected component name appear alternately in the display window.)

3. press up or down arrow to select "zone2"

4. press LEARN to complete the Zone 2 setup.

5. press source select up arrow to display Zone2 in the window.

6. press an input selector button to select input source u want to listen to in the second room

7. u can control the component by using the component control area button


Dec 26, 2010 | Yamaha RX-V2200 Receiver

1 Answer

Need to hook up large speakers

Go for it. As long as the impedance of the speakers is acceptable to the amplifier you're using, size doesn't matter. ;)

Nov 21, 2009 | Audio Players & Recorders

1 Answer

How do I hook up a turntable

You may have two possibilities depending on the configuration of the turntable.
Your Denon should have inputs marked for 'Aux,' 'Line' and possibly, if it is built with the expectation of use with a turntable, 'Mag' or 'Magnetic.'
Your turntable may have a 'Line' output or only a shielded cable carrying a very small voltage from the magnetic head. I assume the pickup is magnetic and not crystal which has a much higher output level but also a higher impedance that requires a matching input.
You should have any of the above outputs in pairs and if the color coding conforms to current standards, there should be in- and outputs marked with red (right channel) and white (left channel).
I would first try connecting the turntable's leads to the 'Line' input since most later turntables have a small amplifier circuit built in that will take the signal from the pickup, amplify it, and match it to the levels and impedance of the line input on the Denon.
There isn't any danger of making a fatal mistake and you should hear right away if there is excessive distortion or a loudness even when the level is set to a low setting; this implies that the output from the turntable is higher than that input wants to see.

Oct 03, 2009 | Denon AVR-1907 Receiver

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