Combination of chipamps

[mischa72]

Hello all,

Before I used the name Rallyecoupe, but this registratoin did not give me the opportunity to post (strange), so I made a new account.

Now, to my question:

I am planning to build a chipamp for my Dayton Seventeen speakers. I want to Bi-Amp, so I need 2 Amps for each channel.

For the bass I want to use a dual-mono LM4780 kit, but for High (it´s a 2-way speaker) I am not quite sure which amp to use. Is there a difference in sound between the LM3875 and LM3886?
I want to order the amps at audiosector.com, but here I can´t order the LM3886 kit. Why I prefer this amp? Because I think this one sounds most like the LM4780 (which are 2 LM3886 amps in one housing). At audiosector.com I can only order the LM3875.

The other option is to use 1 LM4780 for both High-channels. At this point I don´t know if the channel separation is as good as with 2 separated amps. For the supply this all doesn´t matter, because I have 2 500VA toroids for the 2 supplies.

So, what would you do and, more important, why?
LM4780 + LM3886
LM4780 + LM3875
LM4780 + ½ LM4780
LM4780 + LM4780 (maybe too much power on the tweeter)

The passive filter will be in the speakers, so I don´t use an active crossover.

Kind regards,
Mischa

[Netlist]

You must have missed your own post.
http://www.diyaudio.com/forums/showt...223#post651223

/Hugo

[Nuuk]

I prefer the sound of the LM3875 to that of the LM3886! However, I am currently using LM3875 for mid/tweeters, and LM3886 for woofers and it sounds fine. ie, I can't say that the woofers sound 'different' to the mid/tweeters!

So I think you will be fine with the combination of LM4780 + LM3875!

[mischa72]

Originally posted by Netlist
You must have missed your own post.
http://www.diyaudio.com/forums/showt...223#post651223

/Hugo

Well, here I asked what I needed beside the kit, now I asked what kits would be best to use. At this moment I allready have the toroids, as you can see in my first post. I have to admit that I haven´t read my old post.

@Nuuk:
What´s the difference in sound? You say you prefer the sound of the LM3875 to that of the LM3886. Why?

Kind regards,
Mischa

[Nuuk]

It's very close and difficult to explain. But to me, the LM3875 is more musical.

[mischa72]

So you say the 3875 is the better sounding one?

If I wouldn't miss the extra power of the 3886 (even if it's only 18W), the choice is easy, then I'll go for the 3875 and I can order everything in one place.

Does someone else have to add something to this?

Regards,
Mischa

[Nuuk]

Just how much is the '"high" part of your speaker going to need?

[Nordic]

I feel the same as Nuuk, its hard to put my finger on it, but I also found the LM3875 easier on the ear...

Also its much easier to work with, when you cut off the NC pins there is only 5 pins to work with, you can even fit that onto veroboard, with a little bending...

No mute pin to contend with etc...

[mischa72]

Originally posted by Nuuk
Just how much is the '"high" part of your speaker going to need?

I really have no idea. I hoperd you could tell me. On the other side, the power supply is heavy enough to use 2 LM4780 amps for each channel, but I wouldn´t know how large the heatsink should be if I did this. The difference in price is not that much, as I have seen.

Mischa

[Nuuk]

Do you have any specs you can share with us on your speakers? That would help in deciding how much power you need, and therefore how big a PSU you need, what chips are best, and what size heat sink you may need.