G.

On the other hand, you don't care about the whole curve, just an average impedance value, yes? Looking at it that way, you have a loudspeaker with 8 ohms advertised impedance and another with 16 ohms advertised impedance, connected in parallel.

So use the forumla Zt = 1 / (1 / Z1 + 1 / Z2), and you'll find that Zt is 5.3 ohms.

In practice you'll find a little different story. This 5.3 ohm impedance will be in the 100 to 500Hz range, where your four π speaker's impedance is closest to 8 ohms and your JBL 3677's impedance is closest to 16 ohms. Below 100Hz, you'll have several impedance peaks - two from each loudspeaker. Above 500Hz, the impedance of the woofers starts to rise, approaching an open circuit where other components are dominant. By the crossover frequency, the tweeter circuits provide most of the load, which is of a slightly higher but relatively linear impedance.

So all that to say no matter how we slice it, a loudspeaker's impedance curve is more like a roller coaster than it is a fixed resistance.

And you can hear those notes with 6.5" speakers if you do it right. Maybe not loud, but right enclosure, right speaker, it's perfectly plausable.

Adam

A complete four π loudspeaker, assembled and ready to play, costs less than the JBL 2242 woofer from a Professional Series four π-18. The cost of a pair of these Theater Series four π speakers plus the ultra-expensive palletizing and trucking them across country is still hundreds of dollars less expensive than a single TAD 4001 compression driver, without its required horn. So really, it's not a "fair fight" to compare a component that costs a hundred or two-hundred dollars to one that costs several hundred or even a few thousand dollars.

I certainly wouldn't feel "disheartened" to own speakers with Eminence components. I'll tell you what would disgust me. To purchase a single 50 watt speaker motor that costs more than $15,000.00 would disgust me. That's what I mean by "price/performance ratio."

I will give you a pat on the back... I placed my satelites on their sides on top of the two 10 pi enclosures to give them some treble, and the whole system has just completely come alive... The bass is tight, punchy, it sounds deeper, midrange is great... its all just great... I can't wait to get the horns in.

My friend has been helping me (doing most of the tough work) get the bracing finished on the second set... We should be done that up by tomorrow.

I'm very excited!!!

Adam