More Model 19 questions

**les winter** · November 22nd, 2010, 03:35 PM

My 19's are clones, with 416Z woofers and 9028A horn drivers. Presently they are tri-amped with the horn/woofer x-over at 24 db/oct 1200 hz. Sounds really nice.

But I have a curiosity as to what the originals sounded like. I'd like to try the passive crossovers. So I have an 8ohm horn driver and a 16-ohm low frequency speaker.

Can I build the original x/o and hang a 16 ohm resistor across the woofers? Swap the woofers for 8 ohm versions? Build the Zilch version and adjust for the higher woofer impedance?

Any input appreciated.

thanks
Les

**ZilchLab** · November 22nd, 2010, 04:26 PM

Originally Posted by les winter

Can I build the original x/o and hang a 16 ohm resistor across the woofers? Swap the woofers for 8 ohm versions? Build the Zilch version and adjust for the higher woofer impedance?

Unless you have HF compensation in your active setup, you're not hearing M19 performance.

Build Z19s, doubling the L and halving the C in the lowpass for 16 Ohm woofers. If the HF ends up out of the adjustable range (too "hot"), lower the bridge cap from 6uF to 4 uF to increase the overall HF attenuation....

**les winter** · November 22nd, 2010, 04:55 PM

Thank you Zilch. I should have included that I am using the compensation from the original 19's for the horns. Has anyone listened to both the Z19's and the originals and commented? I searched around but didn't see anything posted.

thanks again.
Les

**ZilchLab** · November 22nd, 2010, 06:17 PM

One or two builders have compared them. I suspect a large element in their preference for Z19s is that the components are all new, and to spec. Nobody's done the Solen vs. Dayton vs. whatever thing yet.

The alternative source of HF drive in Z19 results in a wider range of adjustability and reduced interdependence of the controls, i.e., they're easier to get "right." They are also biampable, for those who might desire even further SPL freedom, or prefer to run the HF on toobes....