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unbalanced / balanced

Son of Magni

Son of Magni

May 10, 2005
1,427
6
NH
www.thorbass.com
Disclosures
Builder: ThorBass
#1
Thinking about the "pickup wiring" thread, and after a couple of stream of consciousness jumps, I was asking myself...

Why do we use unbalanced signals between the bass and amplifier? I can't see any good reason for this low-tech standard. I seems like, especially for unbuffered signals, we apparently just don't care about signal quality. What's up with that?
 
#2
The amount of current necessary to drive a balanced output is impractical for an instrument and what is the real gain? (pun intended). Of course, Alembic has been doing this for decades. I think current pickup design and electronics (preamps) are good enough to get a nice clean output. Plus, thousands of amps are already made to accept a high impedance instrument ...you will need to haul around your outboard preamp (here's alembic again) in order to use these amps. That's my thought on the subject, anyway.
 
#3
wilser said:
The amount of current necessary to drive a balanced output is impractical for an instrument and what is the real gain? (pun intended). Of course, Alembic has been doing this for decades. I think current pickup design and electronics (preamps) are good enough to get a nice clean output. Plus, thousands of amps are already made to accept a high impedance instrument ...you will need to haul around your outboard preamp (here's alembic again) in order to use these amps. That's my thought on the subject, anyway.
Click to expand...

Please correct me if I'm wrong, but don't we use balanced signals for microphones *because* they are low current / high impedance?

I agree that you would want an amp with a balanced input, or maybe use a microphone preamp :) Just because the amps conform the the problem doesn't mean they're right...

You use the phrase "good enough", Telegrams were good enough too once, right?
 
#4
I would love to use balanced connections throughout my entire set up. But the equipment builders do not seem to agree with me :crying:. I think it is the cost to benefit ratio isn't high enough for companies to do it
 
#5
To further your analagy going from unbalanced to balanced is not like going from telegram to email.

It's telegram to slightly improved telegram. That pretty much does the same job as before.

Are signals going to amps suffering so badly that it's worth over hauling an entire industrial standard and basically making any amps made before the overhaul useless without extra equipment.
 
#7
To me, the real issue is not going from instrument to amp with an unbalanced connection. The noise in a live environment is insignificant. But when you are recording it's a whole new ball game and noise becomes a problem. That's where I want a balanced signal.
 
#8
If I understand correctly, and IMO, there are a few main reasons.

1. Cost. Creating a balanced signal (from any conventional pickup) requires either active circuitry or a balancing transformer, therefore it involves cost, (therefore Fender wouldn't do it,) therefore it is not done.

As had been said, Alembic has done it forever, but nearly no one else is interested.

2. Compatibility. Standard amps aren't built to accept the signal, standard cables aren't built to carry the signal.

3. History. People generally do not want change in certain areas. This includes probably most of musical instrument design. Think of all those standard Fenders and Fender-alikes, that vary little from the 50-year-old designs; the "vintage design" replicas, that mimic them as exactly as possible; the "vintage" pups that try to duplicate outdated methods and materials (scatter winding; "authentic" cloth braid over output wires; who cares what varnish is on the magnet wire, it's a damned dialectric!); the "vintaging" of brand new guitars.

4. Motivation. People expect guitars to buzz live, so there is no impetus for change. The Fender J bass could have been switched long ago to a pair of stacked humbuckers that sounded close enough to the original single coils allowing buzz-free use of a single pickup.
 
#9
pilotjones said:
2. Compatibility. Standard amps aren't built to accept the signal, standard cables aren't built to carry the signal.

3. History. People generally do not want change in certain areas. This includes probably most of musical instrument design. Think of all those standard Fenders and Fender-alikes, that vary little from the 50-year-old designs; the "vintage design" replicas, that mimic them as exactly as possible; the "vintage" pups that try to duplicate outdated methods and materials (scatter winding; "authentic" cloth braid over output wires; who cares what varnish is on the magnet wire, it's a damned dialectric!); the "vintaging" of brand new guitars.
Click to expand...

#2 and #3 are the real reasons.

Remember that the electric guitar was invented in an era when tubes were the only amplifying device available. A high impedance pickup could drive a tube stage directly, without a transformer in between. An unbalanced coaxial cable was just adequate to carry the signal between the guitar and amp.

There's no real reason other than tradition and backward compatibility that you couldn't wind low-impedance pickups and send the signal passively through shielded twisted pair (microphone) cable. You'd need a mic preamp or a step-up transformer at the receiving end. The real problem would be the extended treble response - few bassists would be comfortable with that tone.
 
#16
I've seen basses with balanced outputs... years ago, the bassist in my band had a "Heartfield" (imported by Fender/made in Japan) 5-string with an XLR out. He rarely used it because it had a static problem, but it was there...

Of course, it DID have an active preamp
 
#17
Right. A passive DI is the balancing transformer I mentioned earlier, usually with a ground lift switch, a a filter switch with a cap, and an aux output that's a simple parallel with the input. If you have a DI that you like (there are individual tastes involved, just like with pickups) you can strip out the important bits and mount them onboard.

Manne also offers a bass with a balanced XLR out standard.
 
#20
I think it would make everything just to complicated(unless they started with this from the beginning)

as mentioned before...
pedals don't have them, amps don't have them, rack tuners don't, other rack gear(well some do, but effects made for guitars/basses usually don't), basses don't....

so if you have all of the above, changing to a balanced signal would require A) a new setup or B) a complete rebuild of your setup... both will result in an unhappy bassplayer I think...
 

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