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LM3886 Chipamp Kit and optional Ci (feedback capacitor)
http://diyaudioprojects.com/Forum/viewtopic.php?f=10&t=366
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Author:  Gio [ 25 Jan 2009, 19:22 ]
Post subject:  Re: LM3886 Chipamp Kit and optional Ci (feedback capacitor)

megamahi wrote:
@gmilitano: Yup, not much at all. I'm not familiar with Polk as I'd like to be. I know Boston and Focal well, I have a set of Polk reference monitors, but they don't get used much as I'm not back home, and they are connected to a working system. When they show up I'll have to take off the binding post block and look to see if there is a XO in there somewhere.

I would not work about biamping unless you have plans to use a digital crossover unit instead of a passive XO, but it should help a bit.

Author:  RiGuy [ 25 Jan 2009, 19:25 ]
Post subject:  Re: LM3886 Chipamp Kit and optional Ci (feedback capacitor)

Gio, I dont know much about multi amping. Can you explain why?
Ri

Author:  Gio [ 25 Jan 2009, 20:17 ]
Post subject:  Re: LM3886 Chipamp Kit and optional Ci (feedback capacitor)

When you go from a source, say a CDP into a digital XO, your output will be broken into lows and highs (assuming 2-way) which each need to go into a amplifier and then to the LF and HF drivers.

Author:  megamahi [ 25 Jan 2009, 21:15 ]
Post subject:  Re: LM3886 Chipamp Kit and optional Ci (feedback capacitor)

@gmilitano: Your talking about something like ESP's Project 9 correct? http://sound.westhost.com/project09.htm

Author:  RiGuy [ 25 Jan 2009, 21:21 ]
Post subject:  Re: LM3886 Chipamp Kit and optional Ci (feedback capacitor)

So, why no passive crossover? What happens that makes it more difficult, or is that just it, its more difficult?
Ri

Author:  Gio [ 26 Jan 2009, 09:55 ]
Post subject:  Re: LM3886 Chipamp Kit and optional Ci (feedback capacitor)

Yes, an active unit like that shown as ESP. The high and low will need it's own output. You could also do the same with a passive XO.

Here is a good article on biamping: http://sound.westhost.com/bi-amp.htm

Author:  the.sabs [ 27 Jan 2009, 16:55 ]
Post subject:  Re: LM3886 Chipamp Kit and optional Ci (feedback capacitor)

This is good,

I've just read that biamping link, and interesting stuff. like i said i would mind trying an HT after this build, using the same chipamps for the channels.

Again like Ri asked why no passive XO?

Author:  Gio [ 27 Jan 2009, 19:22 ]
Post subject:  Re: LM3886 Chipamp Kit and optional Ci (feedback capacitor)

the.sabs wrote:
Again like Ri asked why no passive XO?

Personally, I don't think it is worth the cost for the minor gain.

From the ESP page as well:
Quote:
Passive biamping (where two amplifiers are used in a bi-wiring connection) is, IMHO, a waste of money. Although there may be some moderate sonic benefits, they are not worth the expense of the extra amplifier.

Author:  the.sabs [ 05 May 2009, 17:37 ]
Post subject:  Re: Sabs Phono Preamplifier Kit

Hey Gio,

Just been looking at my possible heatsink problem with this build. The details for the sink give a dissapation of 8.6°C/W. from what i can make out on the LM3886 datasheet, i'm within the limits.
Did i read the correct graph?

Author:  Gio [ 05 May 2009, 19:32 ]
Post subject:  Re: LM3886 Chipamp Kit and optional Ci (feedback capacitor)

Hi Sabs, what will the supply voltage be and what speaker load will you be driving?

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