New Heathkit AS101 owner - First post.

[voice of the theater]

I find tweeters ruin the imaging of horn based systems ( unless crossed above 10K ) / so I discourage their use .

Also, since I like the sound of aluminum diaphragms much more than the plastic type frams, I'd be inclined to seek out an 802 / 902 variant that could work with your AS101's .

I agree--I'd replace your 806 drivers with 802-8G drivers (or 902-8A). Both have a nice extended high frequency response and will sound great with your 416 woofers. I own a pair of Altec Model 14's with 902-8A drivers and two pair of Model 19's with 802-8G drivers and both have a great extended H.F. response--plenty of sizzle and no need for a tweeter. Just ask AB about his Model 19's. The AS 101's are great speakers with great bass, mids, and treble up to around 13-14k. Past that is their weak point. As AB stated, the 806 drivers roll off at around 13-14k. I know the specs for them say up to 22k, but the response past 13 or 14 k drops off steadily and isn't really usable. BTW, I mentioned this potential upgrade to you on page one of this thread (in post number 2 of this thread). Zilch was a Valencia owner, and this was part of his recommended upgrade for Valencias. Since you're biamping, you won't need to replace the AS 101 crossover with the Model 19 crossover--which was the other part of Zilch's recommendation for this upgrade.....

...Down the road, there are other mods you can try. Zilch (who you noticed chimed in with some advice for me in my LH thread), owned Valencias and had suggested as a possible upgrade for Valencias/AS 101's replacing the stock 806 drivers with 802-8g drivers and replacing the stock crossover with Model 19 crossovers or Z19's (his version of the Model 19 crossover). If you ever decide to try this, Great Plains Audio (former Altec employees using authentic vintage Altec designs and tooling) makes brand new 802-8G drivers and brand new Model 19 crossovers or you could buy vintage Altec 802-8G drivers and Altec Model 19 crossovers on ebay. Selling your 806 drivers would give you a decent chunk of change towards 802-8G drivers. However, if you try this upgrade, I recommend keeping the 806's should you ever want to return the speakers to their "stock" configuration (if you want to sell them some day, etc.) This upgrade extends your h.f. response--you end up with speakers that are very similar to Altec Model 19's (416 woofer with the same h.f. driver and crossover that are in Model 19's)....