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Old 5th May 2011, 12:54 PM   #1
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Question CLASS A TUBE AMPLIFIER FOR TWEETER

How many watts are needed in a tube amplifier class A to drive 4 of this tweeters (active crossover with minidsp) ? thanks !

Fountek neo cd 3

Sensitivity
93dB/1m/2.83v

Power handling
17W nominal,40W max

Frequency range
1,400-40,000Hz

Nominal impedance
7 ohm
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Old 5th May 2011, 01:16 PM   #2
adason is offline adason  United States
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are the tweeters in series? parallel? combined?
how many watts it takes depend on the resistance, therefore it depend how they are wired and on spl you need

you need to specify how loud you want, that dictates the watts you need

btw: it does not matter if the amp is class A or not, watts are watts...
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Old 5th May 2011, 01:21 PM   #3
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wired in paralell , 2 for each channel. for bass i have a 150w amp , mids another 150w amp , i need a 3d amp for this tweeters.

Last edited by lduarte1973; 5th May 2011 at 01:27 PM.
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Old 5th May 2011, 01:27 PM   #4
Doz is offline Doz  United Kingdom
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Quote:
Originally Posted by adason View Post
are the tweeters in series? parallel? combined?
how many watts it takes depend on the resistance
? Watts IS watts ...

12 Watts into 7 Ohms is 12 Watts
12 Watts into 3.5 Ohms is 12 Watts
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Old 5th May 2011, 02:42 PM   #5
adason is offline adason  United States
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Originally Posted by Doz View Post
? Watts IS watts ...
watts are watts, no matter what class of amplifier...
go f yourself!

Last edited by adason; 5th May 2011 at 02:45 PM.
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Old 5th May 2011, 02:43 PM   #6
adason is offline adason  United States
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Quote:
Originally Posted by Doz View Post
12 Watts into 7 Ohms is 12 Watts
12 Watts into 3.5 Ohms is 12 Watts
wtf are you telling?

Last edited by adason; 5th May 2011 at 02:50 PM.
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Old 5th May 2011, 02:48 PM   #7
adason is offline adason  United States
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Quote:
Originally Posted by lduarte1973 View Post
wired in paralell , 2 for each channel.
now that's an important information you failed to tell first, I am sure you can figure the resistance!
now when you have resistance, you need to provide an information how loud at what distance...and there you go! from sensitivity you get watts required
congrats!
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Old 5th May 2011, 02:54 PM   #8
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Quote:
Originally Posted by lduarte1973 View Post
wired in paralell , 2 for each channel. for bass i have a 150w amp , mids another 150w amp , i need a 3d amp for this tweeters.
Probably need more than your average small SE will provide I suspect, as you've got 300W below it!

A quick test with any old amp will give you an idea, based on that and the power it was running, design the SE to supply....

Maybe a Big ole 845 amp might do it I dunno...

TOO many variables to say exactly how much power you'll need...

The size, decorations, shape, and floor/wall coverings in/of your room will affect the perceived power of the HF system, as well as speaker-placement In that room, so you really need to do some testing and see....
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Old 5th May 2011, 03:13 PM   #9
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Quote:
Originally Posted by adason View Post
now that's an important information you failed to tell first, I am sure you can figure the resistance!
now when you have resistance, you need to provide an information how loud at what distance...and there you go! from sensitivity you get watts required
congrats!
i dont need great effeciency , I was aming to around 88 db/1m
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Old 5th May 2011, 03:16 PM   #10
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BiAmp (Bi-Amplification - Not Quite Magic, But Close) - Part 1

very interesting discussion on the topic.
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