Hello:
Does anyone have the diagram showing the Dynaco A25 speaker in multiple hookup arrangement, such as stacking 4 or more speakers per channel. I recall that it is a combination of series and parallel wiring mode. I once saw the Dynaco's stacked at the Philadephia Hi-Fi show back in 1976.

hmm, i thought we had this posted somewhere, but apparently not. it is available though from the good folks at The Classic Speaker Pages

http://www.classicspeakerpages.net/IP.Boar...pe=post&id=3166

Series adds impedance, parallel inverses.

8 ohms + 8ohms in series = 16 ohms
Two set like that, run in parallel, will get you back to 8 ohms.

You also need to know if your amp series or parallels the A/B switch.

An ohm meter is your friend. Better safe than sorry.

Larry check out the wiring diagram for this array, its neither in series or parallel.

Yes it it, just in a different configuration, and a smoother wiring system than I suggested (less wire). In the case if the stack of four (bottom right), the top two speakers are parallel, as are the bottom, but the connector between the two sets (+ to -) is the series connection.

8 + 8 in parallel = 16

Two 8 ohm sets in series = 8.

yes but i was speaking from the perspective of a doofus who barely understands the basic meaning of wiring in series and parallel, because the drawing for the Dynaco array looks different than either method to me.

And you think I just looked at it and figured it out? I think not!

What's confusing is the way the diagram is laid out. It was done the most efficient way, using the least wire. If you separate the four speakers, it's easier to see.

Don't worry, it took me awhile to trace it all out.

the instructions specify a range of Dynaco speakers that can be wired this way, but i wonder if other two-way speakers like Advent etc. can be done the same way?

Yep. Ohms is ohms.
Are Advents 8 ohm?

I should qualify that, because I'm not an expert. The speakers you put in array like that also have to have the capability of the wattage, too. A 20w speaker in series with 100w power is going to act like a fuse.

the Large Advent is 8 ohm. a stacked pair wired in parallel sounds really nice, i'm wondering how 3 pair wired in this configuration would sound...

Two in parallel with one in series (per channel) should (?) show a 6 ohm load, if your system likes that.

i have the amps to do it just fine, but i dont have enough Large Advents... yet.

Problem is, as a line array, there are problems with directivity and boost to the lows but no boost of the highs. I'd be very interested to hear the results since it's only theory to me outside of concerts.

In a parallel circuit the resistance is less than the least amount. in a series circuit the resistance is the total of all resistance. can't remember the formula just the rule.