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[Ryan Rosenberg]

Hi all!  I am powering some QSC K10s with an all-in-one battery+inverter and I'm getting some buzzing from the K10s.  The battery+inverter has two AC outlets and also a DC outlet.  I realize the issue is the shape of the power sine wave.  It seem the K10s don't do a great job filtering.  Is there something I can put between the battery and the K10s that will filter the power to eliminate the buzzing?

Here are more details:

A friend and I just got a gig playing a local farmer's markets.  We are guitar, bass and vocals.  I have a small PreSonus mixer and a couple of QSC K10s so we are good to go for sound reinforcement.

Many of the markets do not have power but fortunately I have a Xantrex xPower 1500 which is an in one battery + Inverter on wheels.  I bought it as emergency backup for around the house.  I tried it with our equipment and it looks like we can go quite a while; maybe 5+ hours on one charge.  Only issue is the buzzing.  Is there something I can put between the battery and the speakers to clean that up?  Something I can either plug into the battery's AC outlets or its DC outlet?

[Ivan Beaver]

Hi all!  I am powering some QSC K10s with an all-in-one battery+inverter and I'm getting some buzzing from the K10s.  The battery+inverter has two AC outlets and also a DC outlet.  I realize the issue is the shape of the power sine wave.  It seem the K10s don't do a great job filtering.  Is there something I can put between the battery and the K10s that will filter the power to eliminate the buzzing?

Here are more details:

A friend and I just got a gig playing a local farmer's markets.  We are guitar, bass and vocals.  I have a small PreSonus mixer and a couple of QSC K10s so we are good to go for sound reinforcement.

Many of the markets do not have power but fortunately I have a Xantrex xPower 1500 which is an in one battery + Inverter on wheels.  I bought it as emergency backup for around the house.  I tried it with our equipment and it looks like we can go quite a while; maybe 5+ hours on one charge.  Only issue is the buzzing.  Is there something I can put between the battery and the speakers to clean that up?  Something I can either plug into the battery's AC outlets or its DC outlet?

I know it is not what you want to hear-but get a better quality SINE WAVE inverter.

The cheaper ones do not produce a sine wave-and that is likely your trouble.

A "non sine wave" is fine for many applications, but usually not for audio ones.

Trying to fix the problem after it occurs is often a waste.

Fix it at the source is always the best solution.

[Scott Holtzman]

I know it is not what you want to hear-but get a better quality SINE WAVE inverter.

The cheaper ones do not produce a sine wave-and that is likely your trouble.

A "non sine wave" is fine for many applications, but usually not for audio ones.

Trying to fix the problem after it occurs is often a waste.

Fix it at the source is always the best solution.

Saw that one coming.....Have used these for remote microwave POPS with good luck

http://www.donrowe.com/Xantrex-806-1800-PROsine-1800-p/806-1800.htm

[Don T. Williams]

The battery isn't the problem.  As Ivan has stated it's the inverter producing a very noisy "simulated" AC sine wave.  Some inverters are worse than others, but as stated, an inverter  that produces a "pure" sine wave will solve the problem.

Some very "high end" esoteric home audio gear runs off four high voltage batteries to get pure DC (stereo + and -) for the quietest signal possible.  The job of the power supplies of almost all amplifiers is to change AC (from the wall into DC voltage) for the amp circuits to use.

[TJ (Tom) Cornish]

The battery isn't the problem. 

Agreed.  From a noise perspective, there's nothing cleaner than a battery.  What you do after that on the other hand...

[Ryan Rosenberg]

I know it is not what you want to hear-but get a better quality SINE WAVE inverter.

The cheaper ones do not produce a sine wave-and that is likely your trouble.

A "non sine wave" is fine for many applications, but usually not for audio ones.

Trying to fix the problem after it occurs is often a waste.

Fix it at the source is always the best solution.

Ivan,

Actually I don't mind hearing that I need to get a better inverter.  It is possible -- the battery does have both a DC outlet and even two poles.

But can you recommend a cost-effective inverter?  The one Scott mentions is from Xantrex -- which is the same company I bought the batter from -- but at $1000 it is expensive.  And it includes a power supply as well.  Do you know of anything that might work but costs (considerably) less, and is just an inverter?  Or do I need to spend in that range to get something clean.

[g'bye, Dick Rees]

Cost effective?

We played as a banjo/fiddle duo with vocals for years in the summer months with NO AMPLIFICATION to crowds of several hundred.

Man up (person up) and learn how to project.  It's been done before.

[Tim McCulloch]

Cost effective?

We played as a banjo/fiddle duo with vocals for years in the summer months with NO AMPLIFICATION to crowds of several hundred.

Man up (person up) and learn how to project.  It's been done before.

Banjo AND fiddle?  The Devil's Duo...

Yeah, Dick, I was wondering why this isn't an acoustic performance.  Now somebody out there will wonder why as soundpeople, we would advocate no electronic amplification... and that's gonna be our little secret.

[g'bye, Dick Rees]

If you want to let electricity do the work for you, be prepared to pay the cost:

https://humless.com/go-series/mini/

[Scott Holtzman]

Ivan,

Actually I don't mind hearing that I need to get a better inverter.  It is possible -- the battery does have both a DC outlet and even two poles.

But can you recommend a cost-effective inverter?  The one Scott mentions is from Xantrex -- which is the same company I bought the batter from -- but at $1000 it is expensive.  And it includes a power supply as well.  Do you know of anything that might work but costs (considerably) less, and is just an inverter?  Or do I need to spend in that range to get something clean.

Not sure what you mean by a "power supply", the model I referenced does not have a rectifier for the mains if that's what you mean. 

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