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Old 19th August 2011, 02:48 PM   #1
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Default Prefered type of amplifier

I want to triamplify 2 sets of 3 way speakers with minidsp.What type of amplifier should i choose for each driver ? i have 2 active subwoofers (Class d).

Class D or hybrid for bass ? i need 200W rms.

tube for mid and tweeters ?

Last edited by lduarte1973; 19th August 2011 at 03:00 PM.
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Old 20th August 2011, 09:48 PM   #2
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Originally Posted by lduarte1973 View Post
Class D or hybrid for bass ? i need 200W rms.
?
I am on the same road map than you.
My DCX2496, 2X ways enclosures, Class D system project
On my opinion, Class D has a lot of advantages, here.
Very high damping factor, good to control the HP.
Very good efficiency (>80%), where you need most of the power.
Very, very little distortion.

And, because you don't need high bandwidth you can adapt filtering (if necessary) to reduce the résidual switching frequency to near 0.

Of course, if you like smoother basses, you can make an other choice, to reduce dumping factor. Or use less diameter for your wires.
What will be your cutting frequencies ?
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Old 21st August 2011, 06:05 AM   #3
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0-80 subs
80-250 woofers
250-3500 mids
3500-20000 tweeters

the tweeter value can lower since i will replace the tweeters soon , i have fontek ribbons but i´m considering aluminium domes or soft domes like 810921 Peerless

i want to keep crossover value outside the 300-3000 zone.
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Old 21st August 2011, 10:10 AM   #4
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There is quite a wide philosophical gap between tubes and class D solid state...
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Old 21st August 2011, 11:32 AM   #5
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Originally Posted by ingenieus View Post
There is quite a wide philosophical gap between tubes and class D solid state...
Lot of people say that good class D amps give some kind of "tube" sound. What did-you mean by "philosophical" ? For sure, tube is an obsolete technology, and class D the latest one...
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Originally Posted by lduarte1973
i want to keep crossover value outside the 300-3000 zone. .
On my side, i would avoid cross over between 2500 5000, where the ear is the most sensible. And i find it is more important to keep coherency between fundamentals and harmonics of an instrument than in the fundamental range itself. I prefer a meduium up to 16000 than a tweeter down to 3500.
And i do not care too much at what happens over 16000. I use a motor+horn, between 1000 and 20 000, and i never use the tweeter i can add for the very high. That's just a personal position, of course.
For your amps, why do not first try a pair of cheap good class D amps, one on your basses you will keep for sure, trying the other on each way of the same enclosure to see how it sound in medium and treble ?
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Old 22nd August 2011, 02:31 PM   #6
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i could cross to the tweeter till 8khz . i have a cambridge audio 740c and a tube preamp i was hoping to use maybe for bass or midrange
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Old 22nd August 2011, 02:41 PM   #7
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Crossing the tweeter higher reduces the power requirement a lot. Some tests I have made on some modern over compressed and clipped cds have found that at only 2KHz the amplifier has to swing as much as the LF amplifiers.
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Old 22nd August 2011, 02:56 PM   #8
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Originally Posted by davidsrsb View Post
Crossing the tweeter higher reduces the power requirement a lot. Some tests I have made on some modern over compressed and clipped cds have found that at only 2KHz the amplifier has to swing as much as the LF amplifiers.
That is fore sure. Reason why i prefer horns for medium and trebles, 12db of more efficiency divide the electric power by 16. .I chose my amps for they can deliver the same acoustic level whatever the frequency. On some of my best mixes the sampled 1/3oct peak levels of a tune were near flat from 40 to 10000hz.

Last edited by Esperado; 22nd August 2011 at 03:04 PM.
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Old 22nd August 2011, 03:02 PM   #9
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thank god 95% of my cd´s are before 1992 , my ideia was something like 200w for bass , the ca740a (150w)+pre for mid + and class a tube amp for tweets. i´ll be using tweters 10-15w rms not that much power needed
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Old 22nd August 2011, 03:15 PM   #10
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Originally Posted by lduarte1973 View Post
thank god 95% of my cd´s are before 1992 , my ideia was something like 200w for bass , the ca740a (150w)+pre for mid + and class a tube amp for tweets. i´ll be using tweters 10-15w rms not that much power needed
It was before 1992;-) and a nightmare for the vinyl mastering guy. Peak levels on fast transients.
That why the RIAA curve was done for vinyl.
Drums 's cymbals can generate some kind of HF energy ;-)
Tube amps can handle such peak levels, even with a low RMS power ability.

Last edited by Esperado; 22nd August 2011 at 03:18 PM.
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