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PostPosted: 25 Jan 2009, 19:22 
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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.

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PostPosted: 25 Jan 2009, 19:25 
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Gio, I dont know much about multi amping. Can you explain why?
Ri

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PostPosted: 25 Jan 2009, 20:17 
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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.

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PostPosted: 25 Jan 2009, 21:15 
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@gmilitano: Your talking about something like ESP's Project 9 correct? http://sound.westhost.com/project09.htm


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PostPosted: 25 Jan 2009, 21:21 
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So, why no passive crossover? What happens that makes it more difficult, or is that just it, its more difficult?
Ri

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PostPosted: 26 Jan 2009, 09:55 
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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

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PostPosted: 27 Jan 2009, 16:55 
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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?


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PostPosted: 27 Jan 2009, 19:22 
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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.

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PostPosted: 05 May 2009, 17:37 
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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?


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PostPosted: 05 May 2009, 19:32 
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Hi Sabs, what will the supply voltage be and what speaker load will you be driving?

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