Inductors for line-level passive crossover?
Posted: Fri Feb 19, 2010 11:02 pm
Yo, Dave - Greetings from Raleigh, NC
I'm in the middle of updating my Azurahorn setup, currently using a 170Hz line-level high-pass between the preamp and 'il monstro' to power Fostex 206ES-r drivers in the horns and bi-amping with 70W single-ended MOSFET amps for the open-baffle 15 inch woofers for bass.
Riiiight.
The current not-so-matic preamp uses 27 tubes with 150H parafeed chokes into Altec 15095 outputs (15k:600)
Il Monstro has Altec 15095 as stepup input trannies (600:15k) into an 845 driver and output, with tweaked parafeed caps to roll off bass at ~120Hz.
Today, line-level bump-in-the-cable has 2.2uF cap in series and 2400 ohm resistor in parallel with 600:15k input tranny. OK so far, but mebbe can be better -- still getting a lot of energy from the Azuras below 150Hz.
Thinking about a second-order bump-in-the-cable with a 1.1uF cap in series and a 750mH L in parallel with the 600:15k input tranny.
27 preamp will soon be replaced with a parafeed 46 version using remote-controlled slagle-formers from John Chapman that have been sitting on the shelf since last VSAC. Not sure what that will do to the output impedance and match up into il monstro, but hey, life is an adventure.
Comments? Tut-tuts? What would a pair of your wound nickel beasties run for such a task?
/pRC
I'm in the middle of updating my Azurahorn setup, currently using a 170Hz line-level high-pass between the preamp and 'il monstro' to power Fostex 206ES-r drivers in the horns and bi-amping with 70W single-ended MOSFET amps for the open-baffle 15 inch woofers for bass.
Riiiight.
The current not-so-matic preamp uses 27 tubes with 150H parafeed chokes into Altec 15095 outputs (15k:600)
Il Monstro has Altec 15095 as stepup input trannies (600:15k) into an 845 driver and output, with tweaked parafeed caps to roll off bass at ~120Hz.
Today, line-level bump-in-the-cable has 2.2uF cap in series and 2400 ohm resistor in parallel with 600:15k input tranny. OK so far, but mebbe can be better -- still getting a lot of energy from the Azuras below 150Hz.
Thinking about a second-order bump-in-the-cable with a 1.1uF cap in series and a 750mH L in parallel with the 600:15k input tranny.
27 preamp will soon be replaced with a parafeed 46 version using remote-controlled slagle-formers from John Chapman that have been sitting on the shelf since last VSAC. Not sure what that will do to the output impedance and match up into il monstro, but hey, life is an adventure.
Comments? Tut-tuts? What would a pair of your wound nickel beasties run for such a task?
/pRC
