If you horizontally bi-amp (one amp for woofs, one for tweets) with anything other than an amp with the same gain (not necessarily same output power) you will need an active crossover or other level matching device.
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I enthusiastically second Dave's comment about biamping with one or more subwoofers. Great best-bang-for-the-buck upgrade. Pick up the Paradigm X-30 subwoofer controller (if you're using unbalanced connections between preamp and amp; NHT X2 otherwise or anyway) and a Paradigm sub like the Seismic 12 or Servo 15. Removing the bass from the 60s will really let them shine.
You need an ACTIVE crossover or other level matching device unless the gain of the two amps is identical. Otherwise either the highs or the lows will be at a higher volume than the other. Some would also argue that you should physically separate the woofers and tweeters and do the crossover before the amps, to gain maximum benefit. Personally, if you want to go this route and can get matched amps, I would vertically bi-amp with each amp driving one channel. then the rights (or left) of one amp would drive the highs (or lows) of one speaker the other channel of the same amp would drive the other.
very pleased with the amp section so far, I would say the cd player is the weakest link at this point. Not sure if it would be better to get a dac or just a new player in itself? As far as the bottom end of the sound, I am very happy with it, I dont think spending the money alot of money that is on a sub would do much for me. The reasoning for the question was to find what a difference biamping the speakers would be. And to see where I could make some better improvements, Right now it is a little to bright for me and would like to improve on the soundstage.
Please take the time to read a couple of the subwoofer reviews on the Stereophile web site. It's not just about the bottom end. Adding a properly setup sub impacts most of the audio band. Soundstaging in particular has been my experience -- that of the reviewer as well.
Biamping with the amp in a subwoofer will let your 200 watt amp go further by taking the bass load off the speakers and the amp. This also decreases the distortion being produced by the woofers in your main speakers and to a lesser degree your amp.
Adding a sub increases the "weight" of the sound which to me makes it sound warmer, less clinical.
I used a Cambridge Audio D500SE player in my main system for several years; not sure if that's the model you have. Swapping it out for an Arcam FMJ CD23T (that I used for 4 years) was a nice change to my ears and now using a Benchmark DAC1 is better still.
However, adding an M&K pro sub years ago has had with out doubt the largest positive impact on my system.
I have an opportunity to buy a vintage Kinergenics sw150 passive sub with the seperate amp thats been used probably ten times. Perhaps I will audition it first and see what kind of difference it will make. How hard will this be to match up to the mains as far as frequency roll off? Also not sure if the Kiner amp has inputs for the main amp driving the main speakers. How do I go about choking the woofers on the paradigms?