Question about Stanton STR8-30 Turntable

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Hum tried filters di box with ground lift - Stanton STR8-30 Turntable

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Check the connections to the cartridge. If you cannot locate an exterior source of the hum, it could be a fault in the power supply of the turntable, perhaps an Electrolytic Capacitor?

Posted on Mar 26, 2014

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Fixing an humming subwoofer


Filter capacitors in the amplifier or a broken ground (shield) wire. Check if there is a ground lift switch in your system and try it in both on and lift positions.

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How to fix ground buzz


Try using a di box with ground lift switch

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Hum tried DI Box with ground lift ,in line filters no joy


If you have tried and tested the connections to it, plus the connections to the cartridge, then it could be a capacitor in the power supply of the turntable that is faulty.

Dec 30, 2013 | Stanton STR8-30 Turntable

1 Answer

I just purchased a Takamine acoustic/electric EG 350 SC which sounds great until I plugged it into a Mackey sound board. I sounded like distortion was coming out. In other words, it sounded like ****. I...


I ASSUME that you plugged your guitar into a DI box that then used BALANCED XLR cable to the Mackie board??? The guitar generates line level and the Mackie board inputs are mostly mic level... you will get distortion if you overdrive the Mackie board. You could try going into line level jacks, HOWEVER if you go any distance balanced interconnects must be used. Even the line level jacks require using TRS balanced cables. Try is using a DI box, and preferably one with a gain switch. Also fiddle with the ground lift switch on it for least noise or hum. I use the LiveWire brand DI boxes and they seem to work fine. Then it is important to set the gain with the trim on the MAckie so you don't clip. Also be aware that an acoustic guitar can "hear" speakers and you can get feedback or regeneration that will sound like you are in a cave.

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1 Answer

Need manual


A DI like this is so simple one doesn't need a manual. If you get buzzing or hum, try opposite setting of the Grd Lift switch. This switch breaks the ground connection of the XLR output connector to the case/shield. The attenuation switch allows you to vary the output from this for devices that generate different levels. Set the attenuator to 0 for low level devices and to the middle setting for mid level and use the -40 Db for high output devices. The two 1/4 inch jacks are in parallel so you can for instance run an instrument into one and back out to your amp and the XLR then goes to mixer for the house PA. Passive guitars you would usually use the 0 Db setting and keyboards often the mid setting or the-40 Db. One caution as I use these boxes... it is easy to leave the slide switches "between" settings and you will get no output.

Aug 11, 2011 | Live Wire Solutions SPDI Passive Direct...

1 Answer

I have a hum that almost disappears when I touch the output jack. It isn't at all related to leads, external influences. I have tried different amps, leads, new battery etc.


As a test, if you can find a system that you can connect with a short lead to a DI box set to "ground lift" and that then goes to an amp or mixer try it and report results. In the meantime VERIFY that your power system is grounded (three wire plugs on the amp) Verify you are at least 6 feet from the amp or other devices generating magnetic fields. I suspect the cause is bad grounding of the amp due to the receptacles or a broken ground pin someplace in the system.

May 03, 2011 | Fishman Classic 4T Pickup & Santos...

1 Answer

Speaker humming....what is the course?


How to Eliminate the Hum and Buzz from your Sound System

Is your sound system making noises you don't want to hear? Try these tips to clear it up!

Instructions


Hum is usually the result of using electrical outlets with different grounds. To verify this, run an extension cord from the outlet that the amplifiers are plugged in, to the mixer.

Remove all the DI boxes and adapters. Connect the mixer to the amplifiers with balanced cables.

Be sure that all your cables and connectors are correctly wired:

Pin 1 shield
Pin 2 + white/red
Pin 3 - black

Note: If the system has an electronic crossover, equalizer, or limiter....you need to keep them in the signal chain to protect the system from damage. Just make sure all the cables are balanced and the pin-out on the connectors is correct.

If your gear doesn't have balanced connections use good shielded cables with the proper connectors.... NO ADAPTORS!!!


If the system still has noise, check each channel on the mixer by removing the input connections. There may be a DI box on stage that is also interacting and causing a ground loop. If that is the case try a different DI and make sure that all the instruments and amps on stage are also on the same dedicated ground as the mixer and amplifiers.


If the hum is gone using the extension cord you will need the have your electrician run a dedicated ground to the mixer and amplifier electrical plugs.

Simple Static Eliminationarcalian.com
Is static causing problems in your reel-to-reel (web) process?



Tips & Warnings

*
Removing the DI boxes, hum eliminators and bad cables may improve the sound quality...unless the DI boxes use very expensive line level transformers (Good ones are about $75 for just the raw transformer inside the box) the signal is being squished thru a $5 instrument level DI box.
*
DO NOT lift the grounds on any of the AC inputs to the amps or the mixer as this could result in electrocution. OUCH!


Hope it helped..

Please don't forget to rate me ..Thanks...

Have a nice day..

Feb 21, 2011 | Eltax Atomic A-10.2R Speaker

1 Answer

After a power outage I have a loud hum.


Hi, The Ground Rules Of all the annoyances that can afflict any audio/video home theater or even a simple stereo installation, the notorious "ground loop" may well be the most difficult and persistent one to track down and eliminate. A "ground loop" is caused by the difference in electrical potential at different grounding points in an audio/video system. (All the grounds in an A/V system should ideally be at "0" potential.) A ground loop typically adds a loud low-frequency hum or buzz as soon as you plug in any of various audio or video components, including subwoofers, cable-TV outboard boxes, satellite-TV feeds, TV displays, amplifiers, A/V receivers or turntables. The buzz/hum is a byproduct of the multiple power supply cables and a ground voltage differential within your system and its network of interconnecting cables.

Here are some methods to help you get rid of ground loops. Try these first and don't waste money on a power "conditioner" which, in most cases, won't help. (There is no need to "condition" the AC power for your system. Your receiver or amplifier already has a power supply with its own filters and transformers. No further filtering is normally required.)

If you get your system up and running and hear an audible buzz or hum, the first culprit to look at is either the powered subwoofer or your cable-TV or satellite-box feed at the entry point to your system.

First, the subwoofer: unplug the coaxial cable that connects to your powered subwoofer to see if the ground-loop hum disappears. If it does, it's likely coming in through your cable/satellite TV feed.

Reconnect your subwoofer's coaxial cable from the subwoofer input to your receiver's subwoofer output and disconnect the cable-TV feed (or satellite feed) from your outboard set-top cable box or satellite tuner. Be sure and disconnect the cable before any splitters. Now see if the hum/buzz from your subwoofer stops.

If that eliminates the hum, you can install one of these inexpensive in-line ground isolators from Parts Express or Bass Home. Note that these transformer-based ground isolators will work fine with analog cable-TV feeds, but depending on their design they may interfere with or block reception of HDTV signals via a digital cable or satellite dish feed.

Install the ground isolator between the cable-TV feed and the input of your outboard cable-TV box or satellite tuner (or the TV display's antenna or cable input if you have a set with a built-in TV tuner or a cable-card ready set). In many cases, the ground isolator will "break" the loop and remove the annoying hum or buzz by isolating the TV-cable ground.

If a hum remains with the TV cable completely disconnected from your system, or you don't want to risk degrading reception of HD signals from a cable or satellite system, then you may have to add a ground isolator like this Radio Shack Model 270-054 between the line-level coaxial subwoofer cable from your A/V receiver and the line-level input jack on your powered subwoofer.

In all cases, if your subwoofer has a ground-lift screw like some of Axiom's subwoofers, try first removing the screw (or replacing it) to see if it increases or eliminates the hum. It may or may not make a difference.

If you do not have easy access to the aforementioned ground isolators, here are a few more tips:

Try plugging the subwoofer into a different AC outlet in the room, one that isn't supplying power to your components (A/V receiver, TV, cable box, etc.). That might fix it.

Try reversing the AC plug for your A/V receiver or the powered subwoofer. If it's a 3-wire plug or a polarized plug, which has one prong wider than the other, you won't be able to reverse the plug. For safety, do not use a "cheater plug" to bypass the 3-wire plug.

With the power OFF, reverse the AC plugs one by one of any other components that have a standard 2-prong AC plug that isn't polarized. Each time you reverse a plug, turn on the system with the attached component and your subwoofer and see if the hum disappears. In some cases, reversing one or more plugs will eliminate the hum.

If you have a turntable, try connecting a separate ground wire to a chassis screw on your preamp or receiver and see if the hum disappears. If you already have a turntable ground wire, try removing it from the preamp. One or the other may eliminate the hum.

Finally, here is another solution that worked well for a member of our message boards who decided to discard his ground-loop isolator on his subwoofer: "I took off the ground-loop isolator I'd been using and connected a plain 14-gauge wire to chassis screws on the sub and the receiver then powered everything on. Although hum was still there, it was far lower than before. Next I unscrewed the ground-loop screw on the back of the sub and that took care of the hum completely."

Almost certainly sounds like an earth loop to me, but can be caused by a poorly made transformer or phase shifts on the mains supply. Visit some power conditioner web-sites like Isotek or Isol-8 (or google "earth loop") where there's plenty of advice on how to reduce/eliminate earth loops and other causes of mains-induced hum (transformer problems etc).

Hum on the speakers usually indicates that there is a DC voltage on the speaker line. DC voltage on the output lines would be caused by a shorted output transistor.


Have a nice day...

Feb 16, 2011 | Cambridge Soundworks BassCube 12 Speaker

1 Answer

Sunfire MK II Subwoofer hum. I have a Sunfire MK II subwoofer that hums when it is plugged in (it even hums when no signal is connected). I've tried multiple outlets on different circuits, but hum...


you have a ground loop issue you could purchase a ground loop isolator, jensen makes them for about 40 bucks.I have discovered that if you have cable tv, unplug the incoming cable in your cable box and see if hum disappears.

Nov 25, 2010 | Sunfire True Sub MK II Subwoofer

1 Answer

Input port cracels and buzzes


We can only guess what the input port might be a part of... Computer? Digital recorder? who knows...

You LIKELY have a ground loop. Use isolation techinque to eliminate ground loop. Tools for that often include what is known as a "DI" or direct input box. It often has an isolation transformer in it to break the ground loop. You use or set the DI to "ground lift".

Feb 27, 2010 | Music

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