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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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Can i hook this amp to my home sound system


Technically, yes, but there are some challenges. First, the input voltage to the amp is 12VDC, not 120VAC. You would need to find a power supply large enough to supply 12VDC at 30-40 amps (plus has proper currently limiting or fuses to protect against overloading). Second, most home speakers are 8 ohm impedance. While the amp can power an 8 ohm speaker, the output power is cut in half (compared to a 4 ohm speaker).

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What is a opamp


An opamp is an operational amplifer. The OPA134 is a single amplifier with differential inputs. The best way to describe this IC is that it is an ideal amplifier with infinite gain, with high input impedance and low output impedance making it both a voltage and current amplifier. The output signal is divided with resistors and provides feedback to the minus input to inject negative feedback. The ratio of this feedback basically determines the final gain. The input signal may go to the positive input for a non-inverting amplifier or to the negative input for an inverting amplifier. Roughly the voltage gain in dB will be 20 x log of Vout/Vin. There is a difference in the gain of 1 between inverting and non-inverting for accuracy sake, but that is the basics.
This particular part is very high quality in performance and should be replaced with the equivalent part or one from Burr-Brown. The power supply is typically +/- rails and ground is usually the virtual point between the split supplies representing 0V. Sometimes the input signal will not be referenced to ground and will be fed to both the plus and minus inputs which will be balanced (impedance wise) to form a differential input that rejects common signals such as noise. Pretty cool device, I couldn't live without them. OPA134 Precision Amplifier Operational Amplifier Op Amp Technical documents

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1 Answer

What is impedance?


Check the impedance on the back of the speakers usually listed, and if you are lucky so is the power rating. The general rule is the amplifier should equal the power rating of the speakers for maxium performance or more. If you have a digital meter set it to ohms and measure impedance at the speaker input, if you have a model number do a general search to find out more additional imformation.

May 29, 2012 | Radio Shack Audio Players & Recorders

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Does the input signal to the xti 2002 amp make adifferance balanced or un?


The balanced line input will be used for long runs to eliminate noise. it is low impedance.the high impedance line (unbalanced) is ok for sort runs such as in a rack. if you were say running output from a mixer 50' away you want to use the balaced output on the board and the balanced input on the amp.

Aug 31, 2011 | Crown XTi 2000 2-Channel Amplifier

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What is the ohm value of the input volume controls on this amp?


For the Tascam DP-01 Digital 8-Track Portastudio, here are some of the specs:
  • Analog specifications
  • Inputs (A And B) 1/4" Phone (Unbalanced)
  • Input Impedance: > 10k Ohms (Max), Or 1 M Ohms (A Only) With Switch In
  • Guitar Position: 2.4 K Ohms
  • Nominal Input Level: -10 Dbv -
  • Maximum Input Level: +6 Dbv

    Effect Return 2 X 1/4" Phone (Unbalanced)
  • Input Impedance: 10 K Ohms
  • Nominal Input Level: -10 Dbv
  • Maximum Input Level: +6 Dbv

    Stereo Mix 2 X 1/4" Phone (Unbalanced)
  • Input Impedance: 10 K Ohms
  • Nominal Input Level: -10 Dbv
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Courtesy of Musicians Friend

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1 Answer

Have a Shure SLX Wireless System. The only way the microphone SLX1 or SLX2 is if they are right up to your mouth. If you put the lapel mic on a persons tie you can't hear them. The transmitter is set to...


The Shure SLX2 hand-held microphone has similar performance characteristics to the much-loved (cabled) Shure SM58 vocal microphone. It has a 'cardoid pick-up pattern' intended for close work - being spoken / sung straight into the top of the capsule at no more than about 8 inches from the mouth of the user- to minimise feedback and extraneous noise. If you double the distance between the mouth and microphone the sound level will drop four-fold so distance really matters.
The SLX1 lapel/ lavalier is a semi 'omni-directiona'l pick up pattern microphone, which should work satisfactorily up to 12 inches from the speakers mouth, but closer is better. Always try to get your users to hang it about 6 inches below their chin, at most, and preferably with the top of the microphone capsule pointed upwards towards the mouth.
Here are a few other things for you to try:
  1. There is a volume (gain) knob on the back panel of the SLX receiver unit. Try turning this up to maximum (needs a small screwdriver)
  2. Make sure that both aerials on the receiver are fully extended at different angles to each other and in a clear 'line-of'sight' with the transmitter pack, with no large bits of metal in between which could block the signal. Ideally the receiver should not be more than 25metres from the transmitter. If distance is a problem locate the receiver near to the transmitter and run a balanced (xlr) cable to your mixer/ amplifier.
  3. The angle that the receiver aerials are at should be broadly similar to the angle that the transmitter antenna is at to optimise signal reception.
  4. Make sure the receiver is not located too close to other electrical equipment which may be interfering with the signal (especially voltage transformers, CD or DVD players and hearing loop induction amplifiers which have a strong magnetic field)
  5. Always use good quality batteries - Duracell Ultra or equivalent ( do not use rechargeable batteries as they seldom achieve optimum voltage)
  6. Check that the antenna is tightly screwed into the SLX1 transmitter pack and not damaged.
  7. The SLX2 hand-held microphone has an adjustable level switch inside the body - unscrew the top of the microphone to access it - switch to maximum.
  8. Another possible cause could be an impedance mis-match between the SLX receiver and your amplifier or mixer. There are two outputs on the rear panel of the receiver. One is an XLR (large 3 pin socket) this is LOW impedance and needs connecting to a low impedance input on your mixer/amplifier. You should normally be using this output even if your amplifier has a jack-socket input (use a proper balanced XLR to 6mm trs jack cable rather than a adapter plug). The other output on the receiver unit is a 6mm HIGH impedance, unbalanced, standard jack socket (labelled 'line in'). This would normally be to connect to a guitar amplifier which has a high impedance 'line level' input socket. If you are using this output you may need to use a pre-amplifier to get a big enough signal for a microphone.
You can find the Shure SLX user manual here http://www.shure.com/idc/groups/public/documents/webcontent/us_pro_slx_en_ug.pdf

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1 Answer

Everytime i hook ipod upthe powere cuts off


Possible that the ipod is giving some errors like a high input which is not matching to the amplifier and so make the protection cut off.
Reduce the voltage of the ipod, connect the ipod using a cord that has a impedance matching circuit to the input of the amplifier.
if you are using the earphone output to the aux input it is a mismatch, so the impedance must be matched with a resistor network.... converting a low to a high impedance.

Sep 29, 2010 | Panasonic Home Theater System System

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I want to connect YST-Sw1500 sub woofer to the AX-596 amplifier .How can I do the connections .


on ur subwoofer u will see HPF output, connect this output to MAIN IN of ur power amp (first remove jumper between pre-out and main in from ur power amp) connect pre-out of ur power amp to input 2 L&R (Left is also for mono input). the HFP selector switch will cut off 80Hz or 100Hz to the main input depending on the position enabling u to have high frequency sound on your main speakers. connect the speakers to the main output terminal of ur power amp. do not connect speakers on the woofer ouput.
make sure u are using the right impedance speakers. do not switch speaker impedance selector while the unit is on. 

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1 Answer

I hooked up 2channel 500 watt amplifer and 1200 watt 300 rms subwoofer now the protection light comes on when i turn up volume


your speakers rating is too low for your amplifier. 300 watts RMS means the speaker can operate on an average of 300 Watts continuously. the 1200 watt rating is peak wattage input and meant for intermittent intervals only, a like a bass drum beat count. also , your speaker impedance must match your amplifier impedance or the speaker must be a higher impedance than the amplifier. Never lower than the amplifier's impedance output rating. If The amplifier is rated into an 8 ohm load, your speaker must be 8 ohms or higher. in other words you cannot use a 4 ohm speaker or you will damage the amplifier .

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1 Answer

Amplifiers


Generally speaking, amplifiers are designed with high input impedance so they don't load down or distort the input signal. Vacuum tube and MOSFET input stages are characteristically high impedance. Of course high impedance inputs are susceptible to noise because of the ease with which currents are introduced by stray capacitance or direct electromagnetic field interaction.

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