On my searching I found this great thread, along with a LOT of information on line arrays. I have stumbled upon a large batch of fullrange drivers I want to use for this purpose. The question I just can't seem to find an answer to is that with series/parallel (especially series...) arrangements and fullrange drivers I would think the inductance of the voice coils is going to act as a lowpass filter?😕
How does one regularly work around that? Using a whole bunch of separate amplifier channels? Parallel them all and use a VERY stable amplifier?😱 I would think a big bunch of separate time aligned channels would do the job real nice?
How does one regularly work around that? Using a whole bunch of separate amplifier channels? Parallel them all and use a VERY stable amplifier?😱 I would think a big bunch of separate time aligned channels would do the job real nice?
they don't......
some of the early bose 901 had all 9 drivers (1 ohm) wired in series.
Looking at the inductance it wood seem that way, but wiring 2 drivers in series doesn't remove highs.
Some have prefered 2 series groups of 2 paralleled drivers.
Norman
some of the early bose 901 had all 9 drivers (1 ohm) wired in series.
Looking at the inductance it wood seem that way, but wiring 2 drivers in series doesn't remove highs.
Some have prefered 2 series groups of 2 paralleled drivers.
Norman
Hey thanks, that's good to know! I just didn't find that much info on this particular aspect, but as it's not an issue I now understand. So yo basically just wire them to form a good final impedance....
But I would think that them all in parallel has advantages over them all in series for instance. The resistance of a driver in series will raise the Q of the electrical system. The amount I'm planning to drive can be driven in parallel to the amp that I plan to use. Although the low resulting impedance will then raise THD+N of the amp. What would be a greater disadvantage? Of course the acoustical Q I can still adapt to the electrical Q by building the right enclosure for the drivers....
it is up to you.
if you are driving 2 speakers, then you can do either depending on what you want to do.
I had a friend who barely fixed a marantz amp and brought it to a marantz fair (actual techs). Eventhough his distortion was .5% versus the stock .005%, nobody could hear a difference.
Some say the back emf of 2 drivers in series can sound worse than when 2 drivers in parallel.
Norman
if you are driving 2 speakers, then you can do either depending on what you want to do.
I had a friend who barely fixed a marantz amp and brought it to a marantz fair (actual techs). Eventhough his distortion was .5% versus the stock .005%, nobody could hear a difference.
Some say the back emf of 2 drivers in series can sound worse than when 2 drivers in parallel.
Norman
I guess it'll come down to a lot of experimenting and measuring curves then... I planned to use a four channel amplifier which is 1 ohms stable on each channel. The input impedance of the amp is really high, so that should not present any trouble for the source. Then I have eight 3" drivers per speaker. So I can parallel four speakers for each amplifier channel, two groups of four per speaker driven by two amplifier channels per speaker.
Or run the amplifier at a higher voltage so it is 2 ohms stable per channel and do groups of 2s2p per amplifier channel....😕
I guess I fear raise in Q more than raise in THD indeed, so the first option is probably best.
I shall post my findings here...
Thanks for the help so far.😎
Or run the amplifier at a higher voltage so it is 2 ohms stable per channel and do groups of 2s2p per amplifier channel....😕
I guess I fear raise in Q more than raise in THD indeed, so the first option is probably best.
I shall post my findings here...Thanks for the help so far.😎
np, I've run 2 of the tb bamboo 4" and then a focused array of 4 drivers using the same drivers.
Norman
Norman
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