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Using iMic. Noise gradually builds up even when turntable is unplugged from mains

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Confirm mic-line switch in right position and apply a contact spray in the switch and move switch many times.


Posted on Jul 21, 2008

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I just picked up a Zenith Solid State stereophonic portable turntable. When I turn it on it makes a humming sound. How can I fix it? The model number is NPS40. Thanks, Karen


This is a common problem for older audio equipment. It is caused by old capacitors drying out / changing values / shorting internally.

This problem can be minimized and even eliminated by a process called "forming". Forming is done by gradually applying the voltage to the device over time. You would need a piece of special equipment called an variable isolation to do this. You start at 0 volts and over the course of a day (or more) - gradually increase to 120 volts. Simply plugging the device into a 120 volt outlet defeats the forming process and once done - is irreversible - if the capacitors were the cause of the problem. The only thing left to do is to replace the capacitors; which restores the sound - but not the value of this vintage piece with new components (if that was your goal). Some technicians will install new capacitors inside the old ones to make it appear as original. You'll probably need to have this checked out by a pro.

Good luck!

Oct 20, 2015 | Audio Players & Recorders

1 Answer

IMic doesn't work with Logic Pro 9


I had a similar problem, but I managed to solve it; however, I'm using different recording software. The iMic simply does not have built-in input monitoring. Chances are, you are getting an input-signal but it is not being monitored. Try to find some kind of input-monitoring in your recording software. I found a toolbar, in my recording software, called "playback state" that has an option for input-monitoring. Search the help file index, within your software, to find something similar. Here's a quote from iMic's quickstart guide that might be of further assistance:

"In order to hear your turntable or microphone, you will need to enable an important preference in your recording software, usually called “Playthrough.” It may also be called Monitor, Passthrough, Cue, Preview, etc. Enabling such a feature tells the software how to route your audio, and is necessary for monitoring even when not recording."

Moreover, once you've solved this, I recommend using the iMic for both input and output, as latency with onboard-sound-output will likely be intolerable for input monitoring.

Mar 29, 2010 | Apple Griffin iMic External Sound System

2 Answers

Imic mon only-left channel is all that is seen


Audacity with Griffin iMic under Vista

There is limited and conflicting advice on the web about whether the iMic audio-usb adaptor can be used with Vista (for those who discover that new laptops commonly lack a stereo line-in port, and seek some way to use Audacity as described in the tutorial on capturing music files from vinyl, tapes etc).

In my case at least (Vista business 32 on a Thinkpad X200 with inbuilt Conexant Smartaudio 221 soundcard), it could be made to work as follows:

1. Plug the iMic device (iMic2 in my case) directly into a usb port on the computer. Allow the automatic loading of drivers by Vista.

2. Via control panel or right-click on the speaker icon in the system tray, access the Vista configuration for Sounds.

3. In the Recording tab, you should now see the added iMic usb device (probably designated as a microphone). The default set-up seems to be mono - so you need to make this change for this device: select Properties, Advanced, "2 channel...44100 Hz... CD quality".

I also disabled the built-in laptop microphone so there would be no chance of it interfering with recordings (or software conflicts?) - not sure if this is relevant but easy to test in the event that you strike a problem.

4. In the Playback tab, decide what you want as the default speakers.

The default seems to become the usb adaptor, but I changed back to the built-in speakers for monitoring - not sure if this is relevant but easy to test in the event that you strike a problem.

5. In Audacity (1.3.6 beta in my case): under Edit, Preferences, Recording, choose the iMic device and stereo. Project rate at bottom left of screen should match the quality chosen in Vista set-up for the device (44100 Hz).

6. While in Audacity, Edit, Preferences, Playback, choose the desired speakers (the built-in laptop set in my case) and click "Software playthrough" if you want to monitor what is being recorded (with a slight delay).

7. Immediately testing the set-up to record generated an Audacity "error while opening sound device". This only seemed avoidable by going back to mono settings in various places. BUT all is not lost...

8. Reboot! (With the iMic device connected in my case - not sure if this is necessary.) Ta-da ... all now works as desired for stereo recording. Use the same usb socket for the iMic in future, or you will have to repeat the set-up for each usb socket.

9. The Audacity volume sliders do not work under Vista, but you have several options to adjust recording volume:

(i) Use the slider under the Vista configuration for Sounds, Recording, iMic, Properties, Levels. For me this introduced a lot of hum at high settings, so I recommend keeping it below 5/100.

(ii) Use the iMic slider switch in the Mic position rather than the Line position, and fine tune as in (i) above. For me this gave the lowest background noise/hum.

(iii) Use the headphone out from your hi-fi amplifier and control volume there. This gave more background noise for me.

10. Keep the iMic device away from power supplies (it can pick up hum) and any source of vibration (if you tap it you will see a spike in the signal) while recording.

If you get hum, check whether it is from your laptop power supply (unplug and record using the laptop battery to see if the hum disappears). In my case there was unbearable hum from an iGo Juice supply, but much less from the Lenovo power brick.

After all that it is just about as good as my old Thinkpad X31 which has an inbuilt line-in socket and Soundmax audio card under XP.

With any luck the same approach will help with other ‘new, improved’ (but lacking line-in) Vista computers.

Aug 15, 2009 | Apple Griffin iMic External Sound System

1 Answer

JBL PB10 subwoofer, it makes a loud burp noise when it comes on.


In the industry - It is called "Turn-On Thump".

There are some manufacturers that eliminate components like noise filters on enry level lines to save money.

There is no way to lessen this noise without ripping the amplifier apart and having a technical knowledge of the way amplifiers work. It would involve hard-wiring a slow charge capacitor in the turn on line so it gradually builds power instead of getting it all at once.

Thanks for using FixYa - a FixYa rating is appreciated!!

Feb 10, 2009 | JBL PB10 Subwoofer

1 Answer

I need a grounding wire to connect to my Griffin Imik


not sure I fully follow your question but the 3 rd ground wire from the turntable would hook up to the ground screw on the imic

Jan 21, 2009 | Teac P-A688 Turntable

1 Answer

Akai PX-E855K turntable - switchable pre-amp - how?


To my knowledge this is no switchable pre-amp on this unit. Just connect to your own phono pre-amp and you should be ok.

- OPTiC
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Jan 15, 2009 | Audio Players & Recorders

1 Answer

IMick on Mac Mini


Yes, it does work for the mini (I have the same). Drivers seem to be built into the system, so you don't need to download anything with OS X 3.9 or later. Make sure your switch on iMic is switched AWAY from the mike input plug, and you may try plugging your iMic directly into your MacMini (or through a powered 2.0 hub).

Good luck.

Mar 09, 2008 | Apple Griffin iMic External Sound System

1 Answer

Connecting iMic to G4 iBook


Did u try installing the drivers?Here the link..
http://mac.softpedia.com/get/Drivers/Griffin-iMic-Control.shtml
If it still doesn't work then check if the usb port u have connected it in is functional..u can check this by connecting some other device like scanner, webcam etc., into it..
If it still doesn't work..the the device is probably faulty and u might want to get it replaced..

Nov 18, 2007 | Apple Griffin iMic External Sound System

2 Answers

Spacemaker 1800 Turntable


If the noise goes away when you turn the turntable off, it sounds like you have a turntable drive motor that is going bad. They are fairly easy to replace and not terribly expensive. You can access the motor by leaving the oven in place and UNPLUGGED. Remove the bottom panel. You will need to remove the turntable coupler (the plastic piece that spins the glass carousel) and remove a few screws in order for the motor to come out through the bottom of the oven. There should also be a quick connect plug that plugs into the motor. The motor runs about $35 and the turntable coupler (if you wish to replace it as well), runs about $8. The part numbers are 769741 and 769278, respectively at repairclinic.com. I hope this helps you.

Jul 07, 2007 | Kenmore 66469 / 66462 / 66464 Microwave...

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