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[Tim Weaver]

If I have 9 speakers in a grid pattern in a room one of them falls right over where the podium normally lives.

If I tapped 8 of these speakers at 16 watts, and the one over the podium at 1 watt, does that make the one speakers quieter? Or it doesn't change it's sensitivity, but will run out of headroom way before the others?



I'm guessing that there's no free lunch here and I'll have to run a volume control for that one speaker.........

[Kurt J Nemer]

Think of them as light bulbs- the 1 watt speaker should have  about 12dB less output if I remember my decible formula correctly.

[Tim Weaver]

Think of them as light bulbs- the 1 watt speaker should have  about 12dB less output if I remember my decible formula correctly.

Neat!

[Brian Jojade]

That's one of the coolest things about 70v systems. Need it quieter or louder in an area, tap it accordingly.  Of course, if you need to be able to adjust it after the install, a separate volume control would make more sense.

[Scott Holtzman]

That's one of the coolest things about 70v systems. Need it quieter or louder in an area, tap it accordingly.  Of course, if you need to be able to adjust it after the install, a separate volume control would make more sense.

Your total tapped watts should be close to the amps output however if the amp is 3db less than total that's no big deal as I doubt you are going to be running the system at FTB*


FTB=Full Tilt Boogie

[Mike Caldwell]

That's one of the coolest things about 70v systems. Need it quieter or louder in an area, tap it accordingly.  Of course, if you need to be able to adjust it after the install, a separate volume control would make more sense.

I was going to mention the same thing or just an on off switch for the speaker over the podium.

[Brian Jojade]

Your total tapped watts should be close to the amps output however if the amp is 3db less than total that's no big deal as I doubt you are going to be running the system at FTB*


FTB=Full Tilt Boogie

You shouldn't EXCEED the total watt rating. There should be no issue staying below the rating of the amp.

If you tap less watts, that's just less of a load on the amp. Kind of like using a 16 ohm speaker on the amp instead of 4 ohm speakers.  Load it down below 4 ohms and the amp may not like it much.

The only thing different about a 70v system is that there's a transformer that ups the output voltage (at full power) to 70v, no matter what the initial voltage is.  10 watt amp, 70 volts. 1200 watt amp, 70 volts.  Note that an amp rated at 1200 watts at 4 ohms outputs approximately 70 volts, therefore can be directly dropped into a 70v system.

The cool thing is that if you've got say a 100 watt amp that dies and you drop a 200 watt, or 1200 watt amp in its place, the final output on the speakers ends up being exactly the same.

Yes, using a 1200 watt amp here probably means spending more on the amp than you needed to, but it won't hurt anything.

[Mike Caldwell]

70 volt systems sometimes get a bad rap because of using crappy amps, under powered amps and no proper processing of at least a high pass filter.
Done right with good parts they can work well.

[Scott Holtzman]

You shouldn't EXCEED the total watt rating. There should be no issue staying below the rating of the amp.

If you tap less watts, that's just less of a load on the amp. Kind of like using a 16 ohm speaker on the amp instead of 4 ohm speakers.  Load it down below 4 ohms and the amp may not like it much.

The only thing different about a 70v system is that there's a transformer that ups the output voltage (at full power) to 70v, no matter what the initial voltage is.  10 watt amp, 70 volts. 1200 watt amp, 70 volts.  Note that an amp rated at 1200 watts at 4 ohms outputs approximately 70 volts, therefore can be directly dropped into a 70v system.

The cool thing is that if you've got say a 100 watt amp that dies and you drop a 200 watt, or 1200 watt amp in its place, the final output on the speakers ends up being exactly the same.

Yes, using a 1200 watt amp here probably means spending more on the amp than you needed to, but it won't hurt anything.

You won't always reach the 70 volts until you reach a certain level.

[Mike Caldwell]

You won't always reach the 70 volts until you reach a certain level.

I have ran into a few people who thought....maybe still think that you should be able to always measure 70 volts on a 70 volt system!!

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