line array impedance issue

[toobhed]

I'd like to build a small speaker with 3 indentical 3" drivers, each 8 ohms. I'm having a hard time figuring out how the amp will see between 4 - 8 ohms.

I could parallel two of them for 4 ohm, but this will mismatch with respect to the third 8 ohm. Could I use a resistor leading to the two paralleled drivers to bring the pair up to 8 ohm and then parallel this 8 with the other single 8?

If not, is there any other way to get 3x 8ohms to be seen by the amp anywhere between 4 - 8ohms. Thank you!

[chrisb]

Originally Posted by toobhed

I'd like to build a small speaker with 3 indentical 3" drivers, each 8 ohms. I'm having a hard time figuring out how the amp will see between 4 - 8 ohms.

I could parallel two of them for 4 ohm, but this will mismatch with respect to the third 8 ohm. Could I use a resistor leading to the two paralleled drivers to bring the pair up to 8 ohm and then parallel this 8 with the other single 8?

If not, is there any other way to get 3x 8ohms to be seen by the amp anywhere between 4 - 8ohms. Thank you!

actually why not use this as an opportunity to power taper -as per page 6 of
http://www.madisound.com/pdf/TheCHRA...lan-250811.pdf


while these plans are specifically for the MA CHR70.3, the wiring logic would work equally for triples of any driver - and let's assume that there could be advantages to power tapering a triplet of small/full range drivers in a compact line array

[toobhed]

Thanks for the tip Chris, I'll study the plan and hopefully implement. But just out of curiosity, would the resisitor approach function?

[toobhed]

Chris please disregard my previous post...I looked at p6 and it is the perfect solution! Thanks again for your prompt help!
Regards,
Mario

[chrisb]

Originally Posted by toobhed

Chris please disregard my previous post...I looked at p6 and it is the perfect solution! Thanks again for your prompt help!
Regards,
Mario

actually thanx should go to Dave & the other real brains behind the design