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Author Topic: need help with a 70volt speaker install  (Read 4201 times)

Dennis Butterworth

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need help with a 70volt speaker install
« on: June 16, 2008, 10:36:55 pm »

Our apartment complex is installing 20 ceiling speakers in the club house and 2 surface mount speakers outside. I believe this means we will need to go with the speakers with transformers. However, I have no experience with these at all. Right now the only source equipment they have is a stereo receiver. Can someone suggest some options for this type of install? Also some guidence on the 70volt speakers would be appreciated.
Thanks again!
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Ivan Beaver

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Re: need help with a 70volt speaker install
« Reply #1 on: June 17, 2008, 02:00:41 am »

YOu will need a step up transformer on the otuputs of your amp.

Just add the wattages the loudspeakers are tapped at and make sure that the number does not exceed 90% of the rated power.

Be informed that the "ratings" on consumer gear are often VERY suspect, so you might want to only go to half of the rating for saftey sake.

Trying to do "stereo" in a ceiling speaker situation is pretty much a waste of time.

Go to Atlas sound and look up 70V systems for some good info.

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For every complicated question-there is a simple- easy to understand WRONG answer.

Can I have some more talent in the monitors--PLEASE?

Ivan Beaver
dB Audio & Video Inc.
Danley Sound Labs

Hal Bissinger/COMSYSTEC

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Re: need help with a 70volt speaker install
« Reply #2 on: June 17, 2008, 01:23:36 pm »

You might want to read through this- http://www.rane.com/note136.html

I also STRONGLY advise that you throw that consumer stereo receiver away and purchase the correct amplifier that will have the constant voltage output and multiple inputs that you need. You DON'T want stereo anyway.

-Hal

Don Boone

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Re: need help with a 70volt speaker install
« Reply #3 on: June 17, 2008, 03:18:28 pm »

Some consumer receivers can't tolerate a 70 volt transformer on it's outputs. Decades ago I remember a DIY install that used a JVC receiver from Circuit City driving a 70 line. The receivers would last about a month. After the third replacment Circuit City cried foul and the customer had to buy a proper TOA 70 volt amp.

Don
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Dennis Butterworth

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Re: need help with a 70volt speaker install
« Reply #4 on: June 17, 2008, 03:49:36 pm »

 Thanks! I checked out Atlas Sound and they had everything I needed. They also had a handy Excell spreadsheet that told me how many speakers I needed and at what watts to tap them
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Craig Hauber

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Re: need help with a 70volt speaker install
« Reply #5 on: June 20, 2008, 03:37:20 pm »

I've found some really good economy 70V gear for those consumer-ish type jobs on the Parts Express website.
They have some in-ceiling speakers with or without backboxes as well as plastic surface mount stuff that looks like what most people are used to for home installs ("Dayton" branded, as well as Atlas and other premium brands) -and prices listed.  

Excellent source for those 1-off jobs by people who normally don't do 70V for a living.


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Craig Hauber
CSA Productions Inc.
Ventura-Santa Barbara CA
www.csaproductionsinc.com

Hal Bissinger/COMSYSTEC

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Re: need help with a 70volt speaker install
« Reply #6 on: June 20, 2008, 08:48:21 pm »

I've found some really good economy 70V gear...

Probably just about OK for PA and voice. God help you if you want to use it for music- unless of course you like a 200Hz- 10Khz response.

-Hal

Karl P(eterson)

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Re: need help with a 70volt speaker install
« Reply #7 on: June 20, 2008, 09:44:07 pm »

Hal Bissinger/COMSYSTEC wrote on Fri, 20 June 2008 20:48



Probably just about OK for PA and voice. God help you if you want to use it for music- unless of course you like a 200Hz- 10Khz response.

-Hal


That'll be the -10 down-points for you sir Smile

Karl P
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Craig Hauber

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Re: need help with a 70volt speaker install
« Reply #8 on: June 22, 2008, 01:49:07 am »

I tried a few for bathrooms and such and they had better bottom-end and a less pronounced HF than the EVIDS we use normally.

http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber= 300-416

I ran them at 4 watt tap and they still had decent LF.  I will be trying them on some larger applications soon.  I found them to be a really good deal at only $35ea.  Came out of my own pocket, but client's ecstatic, landed 4 more contracts for new-builds.

YMMV




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Craig Hauber
CSA Productions Inc.
Ventura-Santa Barbara CA
www.csaproductionsinc.com

Hal Bissinger/COMSYSTEC

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Re: need help with a 70volt speaker install
« Reply #9 on: June 23, 2008, 12:05:58 pm »

Might be worth a try. Looks like the went up in price though.

-Hal
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