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13 Responses to “Xlr Cable Assistive Hint”
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An XLR cable is just the standard microphone cable that you can find at any music store (that sell instruments). I think even Best Buy sells a couple versions of this cable. What you really need to make sure is that you know what the ends should be, as in Male-to-Female or Male-to-Male, etc.I personally have like 15 of these cables sitting around, they are about the most basic cables to have if you have any kind of dj/pro sound equipment.If you’re looking to buy online, here is one example of a website that’ll sell you a cable for cheap.http://www.musiciansfriend.com/product/MusiciansFriendLowZMicrophoneCableXLR?sku=361707
Yes, you can use your XLR cables and plugs and connectors for a low power 9VDC application. Before you start doing all this, just make sure how many ohms your electromagnet coil has. If it is below 20 ohms, then you can not use a small 9V battery – you need a larger, more powerful battery, such as a stack of 6 AA cells that would easily deliver 1 A or more.
I would say XLR, as that carries a low level analog audio signal.USB carries digital signal at a higher voltage.Remember that if you want, you can retro-fit ferrite beads on any cable, which damp out high frequency interference. If you wrap the cable so that is passes through the centre hole several times, you will increase that effect.
You don’t lose quality as such. You may gain some noise, but it would have to be under adverse conditions with a fairly long mic run. I honestly don’t think you will be able to notice any difference. If you do, just get a transformer to change the balanced SLR cable to unbalanced at the input to your mixer or amp. This way you still have the advantages of the balanced line. The short bit of unbalanced line from the transformer to the input won’t be long enough to pick up any noise.
It is hard to figure out what the exact assignment is…does he want you to build a tester that tests the continuity of XLR mic cables using only an LED? That is basically impossible – you need some type of voltage to make the LED light up no matter what.If you have an audio mixer nearby, you could use the phantom power produced by the mic input channel to light the LED but you still will need a current limiting resistor. That would work but I don’t know if that fits what the assignment is. The phantom power puts 48 volts dc on pin 2 and 3 of the XLR cable.
Balanced and unbalanced generally serve different purposes but there is overlap. A high impedance microphone is usually unbalanced. A low impedance mic is usually balanced. A balanced wire is two wires carrying a signal. These 2 wires can be shielded or unshielded. A balanced wire is less susceptible to noise than an unbalanced cable. A balanced cable doesn’t use a ground wire as one of the signal conductors. The signal is on the balanced pair. The ground is the shield. If there is a ground it’s less likely to introduce noise into the signal. A standard home phone line is a balanced, unshielded pair. You see a lot of shielded, balanced cables for mic to help prevent noise. A lot of cable to connect line level signals are shielded unbalanced cables. The higher level allows for an unbalanced but still shielded cable while maintaining a decent signal to noise ratio. An unbalanced cable depends on the shield/ground to carry the return part of the signal. The ground might introduce noise into the hot connector if there is a problem.So in general, but with many exceptions, mic cables tend to be balanced and shielded. Line level cables tend to be unbalanced shielded.
XLR connectors (and the attached cables) are used primarily on better quality microphones (probably anything over $25 these days). The cable itself may wall be the same as that used in “TRS” (Tip-Ring-Shield) 1/4″ cable. Both have two signal conductors and one gound/shield conductor. The main use of either XLR or 1/4″ TRS cables is for what musicians and audio engineers called “balanced” signals, and what electrical engineers call “differential”. This is common with mic, because most mics have a very low-level signal, and even with on-mic amplification, the signal is very prone to picking up noise along the way. But if you go a differential signal, most of that noise can be removed. The idea is a cool hack… take your mic output feed it out normally, but also feed it out inverted. If you were to add the original and inverted signals, they’d cancel each other out… so let’s not. Ok, both signals romp on down the cables, and reach your preamp or recorder or some other XLR-terminal. There, the same thing is done.. the inverted signal is now re-inverted. Here’s the magic.. any noise that was added is almost certain to be the same on both conductors. So when we invert the signal, we now have two copies of the original, uninverted signal.. one has NOISE added to it, the other INVERTED-NOISE. So add these together, and we get an amplified signal, with nearly all of the noise cancelled out.XLRs also have other pro-level features.. they’ve very rugged, and they lock in place.. no cables falling out of the mic during a performance. But without actual balanced audio driven into the cable, the mechanical improvements are the only real advantage. One very cool aspect of the XLR standard, along with the locking connectors, is that they chain.. I can hook multiple XLR cables together, and there’s always one male and one female terminal available… and one male and one female as the gear terminals (mics, mixers, camcorder or computer interfaces, etc).You can get single-ended to balanced adaptors from a company called BeachTek… they have many different versions.
1/4 cable (”quarter inch”) is what you should use. (I presume that is what you are referring to as the ‘instrument cable’ ) The xlr jack on any mixer is a microphone input. Which is setup to be very sensitive so it can pick up voice and vocal sounds. Right next to the XLR connection, you should find a 1/4 jack. That is where you should be plugging your keyboard into. A 1/4 jack on a keyboard is less sensitive and is intended to intake a ‘line level’ signal. Which is much louder than a mic signal.Your keyboard should have 1/4 main outputs on the back side. That is what you should be using. The headphone jack is only used if you, the keyboardist wants to listen locally.If you have no choice and need to plug in to a XLR jack on a mixer. You must have a DI box inline. (Direct box) Its a small box that takes a 1/4 input, converts the line level signal down to mic level and sends it back out mic level.§
We don’t know what they are sending to you so we don’t know if you will have a Mic or Line feed.We also don’t know what event you will be recording… I try to NEVER do a board mix. Of all the audio folks I know, only one can send a properly mixed discrete AUX send that sounds acceptable (for live music).
Try your local Radio Shack! I find they have most of my personal needs and I worked in electronics all my life………
Hello Andrey,No doubt, the XLR type is better than instrument cable, for the reason that it is independently grounded through the shielding of the wire.
Connecting the neutral and ground together does not raise the impedence. It merely makes it unbalanced. If you need to change the impedence, you can get adapters (1/4 inch to xlr) with small impedence matching transformers built into them. It really depends on the application. Tell us what the application is, and we can be a little more specific.(added dec. 18 @ 12:49a.m. est)Your best bet in that case, is to get your hands on a direct injection box (D.I. box for short). The ones we used to use were small diecast metal boxes with a 1/4 inch input and a xlr output along with a 1/4 inch output. This enabled us to run a mic cable to the board for front of house sound and an instrument cable from the D.I. box 1/4 output to the guitarist’s amplifier on stage. Inside the box is an impedence matching transformer to change the high impedence of the pickup to a low impedence signal that the board can use. Ours also had a ground lift switch to combat any unwanted electrical noise. You can find them at musician’s friend online or Guitar Center (if you have one in your area). Most other methods of running direct to the board will at best seriously degrade the sound, or at worse “let the magic smoke out” of something in the chain.
Papi – You really don’t want to combine 4 mics into one input. It will not work well if at all.What you really want is a cheap mixer with 4 inputs – that will work great!This is a great little mixer:http://www.zzounds.com/item–BEHXENYX1202