The lower the DCR of the woofer trap inductor, the sharper and deeper the trap. The main difference between a 20 gauge air coil and an iron core will be the DCR. John built his woofer trap counting on a DCR of about 0.15 ohm. As with all crossovers - especially this one - you should experiment. Start with the published values then tune to your room, your drivers, your ears.
FYI, the trap works at ~2000Hz to kill some noise from the woofer.
FYI, the trap works at ~2000Hz to kill some noise from the woofer.
Hi;
I havn't see anything elsewhere, (doesn't mean it isn't) but I'm wondering about the suitability of an Eminence Alpha 3-8 3" full range in place of the TC9. Anyone tried the Eminence?
I havn't see anything elsewhere, (doesn't mean it isn't) but I'm wondering about the suitability of an Eminence Alpha 3-8 3" full range in place of the TC9. Anyone tried the Eminence?
Tonight I finished the Manzanita build, I think. It's been a long but funny journey.
From day one, the Manzanitas created a soundstage with plenty of width, height, and depth. Unfortunately, they sounded a bit muddy.
Was the integrated Burmester too weak? Well, I ordered a power amp. A 2x350W class D power amplifier based on Hypex NCore NC502MP kept the 15" woofers in an iron fist, but still a muddy midrange...
Tonight I finalized the crossovers with proper inductors and terminal blocks for easy resistor change. The former bass trap inductors (tiny 24AWG, 0.89 Ohm) were replaced with heavy (AWG13, 0.11 Ohm) inductors from Jantzen. Would I hear any difference?
Damned I do! I finally got a clean midrange. DCR matters and the bass trap is a must on the GRS woofer. John was right, no doubt.
These are the resistor values I use for the moment:
R1 8.2 Ohm, R2 6.8 Ohm.
From day one, the Manzanitas created a soundstage with plenty of width, height, and depth. Unfortunately, they sounded a bit muddy.
Was the integrated Burmester too weak? Well, I ordered a power amp. A 2x350W class D power amplifier based on Hypex NCore NC502MP kept the 15" woofers in an iron fist, but still a muddy midrange...
Tonight I finalized the crossovers with proper inductors and terminal blocks for easy resistor change. The former bass trap inductors (tiny 24AWG, 0.89 Ohm) were replaced with heavy (AWG13, 0.11 Ohm) inductors from Jantzen. Would I hear any difference?
Damned I do! I finally got a clean midrange. DCR matters and the bass trap is a must on the GRS woofer. John was right, no doubt.
These are the resistor values I use for the moment:
R1 8.2 Ohm, R2 6.8 Ohm.