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Old 20th September 2004, 02:37 PM   #31
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Quote:
Originally posted by ebijma
Why is 12 watts more power more serious?
LM3875 has enough power for me.
And i doubt that the LM3886 will sound better at normal listing levels, with not to difficult speakers.
So................

It's not a question of 12 watts more power.
It's a question of current output.
Around double the current of the LM3875.
What speakers do you have?
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Old 20th September 2004, 02:53 PM   #32
sek is offline sek  Germany
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Quote:
Originally posted by carlosfm
It's not a question of 12 watts more power.
It's a question of current output.
Yep, because the current capability determines the dynamics of your amplifier-speaker system 'before' clipping.

Erwin, even if you don't consume higher power levels, having more dynamic headroom available and keeping the SPiKe-Protection out of the way can greatly help the sound.

Regarding the difference in sound between the different LM38xx-ICs, you have to judge by yourself (just do a pin-by-pin setup to compare), because it's a matter of taste (it's not even for shure that they'll sound different at lower or medium power levels). After all, it shall become a 'serious amp', right?

Ciao,
Sebastian.
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Old 20th September 2004, 03:46 PM   #33
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Both chips should sound the same if well implemented. Except if you have current hungry speakers or listen to music at high levels.

If your speaker woofer is larger than 8" it may be wiser using a 3886 or a parallel set of them.

One thing you can do, if possible, is going to the store with a DMM and measuring the DC resistance at the speaker's terminal posts. Easy to do if the speaker is bi-wire ready. This measurement will not tell you the impedance but it's usually a tell-tale of what it may be.

Or check if there are any tests around for the speakers.

Having some power available, even if you don't use it, means that the amp will be working at its most linear response. Particularly not allowing any clippling that sounds nasty on these chips.



Carlos
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Old 20th September 2004, 04:27 PM   #34
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Quote:
Originally posted by carlmart
Except if you have current hungry speakers or listen to music at high levels.
I say that any modern bass-reflex loaded speaker benefits the extra current of the LM3886.
Independently of the "average" impedance and sensitivity that the manufacturers claim.
I'm only excluding very sensitive speakers (92~93db and up), IF they don't have big impedance dips, specially in the lower frequencies.

Btw, when an amp is not driving a pair of speakers properly it shows even at low level.
It may be subtle, and you only figure it out when you upgrade... the amp.

All, test this with music with strong bass content and dynamics, not choral music.
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Old 20th September 2004, 06:01 PM   #35
ebijma is offline ebijma  Netherlands
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I got some infinity two way speakers here.
Nothing special but they sound very nice.

In the future im planing on building my own set of full range
single driver speakers.
But thats for the future.
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