Audio Asylum Thread Printer
Get a view of an entire thread on one page
|For Sale Ads|
In Reply to: RE: Pure Audio Project Open Baffles & 2 Questions posted by Gerry E. on April 19, 2017 at 14:34:06
I would need to see the impedance curves for both the 15s and the 8" speakers.
Assuming the nominal impedances, 8 ohms in parallel with 4 ohms (from 80Hz down) is 2.67 ohms.
That's probably not the case. Again, you need to look at the impedance curves of the drivers you're using.
The 8" speaker might have a high impedance below 80Hz and the load seen by the tube amp might be around 4 ohms at those frequencies.
4 ohms connected to the 8 ohm tap will show the 300b one half the normal impedance and that will increase the power and increase the distortion.
Have Fun and Enjoy the Music
"Still Working the Problem"
Given that the impedance will be below 4 ohms, WHAT IF... I wired the woofers in series instead of parallel for 16 ohm impedance? Of course I would need to switch to an 8 or 16 ohm low pass filter.
Does series wiring of multiple woofers introduce its own set of issues? Thanks.
Thanks for the response Tre'! The woofer impedance curve is shown below. The Altec 756B bass/mid-range driver is actually 10". It's over 60 years old, so finding an impedance curve won't be so easy. FWIW, I have read that the Altec/WE cone speaker drivers had very flat impedance curves.
Post a Message!
This post is made possible by the generous support of people like you and our sponsors: