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Bi-amp I have an Adcom 5802 that has bi-amp posts on the back. Do these posts have a crossover for highs and mids or what exactly do they do?

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After examining a picture of a 5802 ( I have been servicing adcom for over 20 years ), these are not bi amp posts, but bi wire posts.

Bi-amp means that 2 amps are being used, one for highs, one for lows. This means that you have no crossovers in the speakers, instead, you have an electronic crossover between the amps and the pre-amp. The highs and lows are separated in the electronic crossover. One amp handles the lows, one handles the highs.

Bi-wire means that you have the crossovers still inside the speakers. The amp handles the full range of music ( highs-mids-lows ). Different kinds of speaker wire produce different results. If you have bi-Wire terminals on your speaker, they come with shorting wires, that tie the tweeter + to the woofer + on the back of the speaker, and the tweeter - to the woofer - . When the shorting wires are removed completely, you have now electrically separated the tweeter and woofer from each other, while maintinaing the crossovers ( inside the speaker ) for each.When this is done, you can now bi-wire the speakers and amp, and use different kinds of wire for the lower frequencies and the upper frequencies, depending on your ears ( everyone hears a little differently, thats why there are so may makers of components, and wire ).

Why do we have crossovers?.....the tweeter voice coils ( the things that make the sound ) are made of hair thin wire. This wire cannot handle much power and if you were to put bass in to a tweeter, you would burn the tweeter out almost instantly. A tweeter is a very light, fast moving device which can react very quickly to high frequency sounds ( symbols, triangles, guitar strings....). Woofers are more rugged. They have voice coils made of heavier wire and are designed for larger movements that Bass demands. Subsequently, woofers aren't very good for high frequencies because they are slower devices.

So what do we do ?.....Keep the lows away from the tweter and the highs away from the woofer.....thats the job of the crossover.

In the event that your speaker has the crossover OUTSIDE the speaker box, you should check ( as always ) with the manufacturer of the speaker to see how it can be changed to suit your needs. Remember to always read and follow your owners manual. Good luck....Rob

Posted on Mar 03, 2008

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Hi,i hear alot about bi wireing could someone explain what it actually is used for and what's it meant to do could I'm thinking bout trying it on my speakers?


It's a big job, but the results are great. Bi amp-ing is where the tweeters and mid range speakers are separated and connected to separate amplifiers. You'll need to have the correct gear before messing inside your speakers. You'll need to have another amplifier. Not knowing what amp you have now, getting a stereo signal into the second amp may be a problem since you'll need a line level signal into the second amp. An external crossover is best. Technically, you could use the ones in the speakers, since you'll be removing them anyway. Now for the speaker mods: On the panel where the posts for the speaker wires are you'll need to install another set of binding posts. We're assuming you have separate subs. Open the speakers and remove the cross over. The wires from the original posts should now connect to the mid range speaker. Add wires from the second set of posts and wire it to the tweeters. Now connect the output of the amp to the removed cross over and wire the mid range out on the cross over to the posts that connect to the mid range speaker. Do the same for the tweeters.If you have three way speakers, you'll have to run a 3rd set of wires from the crossover to the woofers in the cabinet using another set of binding posts. Controlling the volume on the second amp will be difficult since you'll have to adjust it manually. Remote control volume level will be lost on the second amp.

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Hi bongodboss

The user manual for this amp has good instruction on how to connect it. You can download a copy from here.

Page 9 has info about using the amp for "bi-amping" The amp is only a stereo unit, so to do a 3-way system, you will need at least 1 amp mono in bridge mode for lows, and other stereo amp for mods, and another stereo amp for highs. You could use the internal low pass filter for the bottom end, and a 2 way crossover for the mids and highs. Much simpler doing a 2 way system with composite bins for mids and highs, and subs for lows. You only need the 2 amps and use the low and high pass filters inside the EP2500. If you need anymore help on this, I am happy to talk to you more.

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