Just some points :So I don't think I want to do a ground up plan for the woofer module... I was thinking of using Jeff Bagby's design or the CSS woofer module design and skip the passive crossover section. I was reading Jeff's white paper and he said he found his CSS woofer module didn't work well for the kairos, but great for the continuum. He felt his woofer module with the sb29nrx worked better with the Kairos. Either way, I'm leaning heavily toward a passive radiator built. I don't want sealed and I want to avoid port noise.
Jeff also made a comment about his crossover affecting the impedance of the Kairos... I really don't know how it will affect the LS50 meta... I'm worried it will drop it's impedance too much.
1. Is there any reason to use the passive crossover or can I simply use a minidsp 2x4hd and 2 stereo amplifiers to cross the LS50 meta with the module?
2. Would the CSS sdx10 or SB29NRX be a better choice for a woofer module?
1. A passive radiator is NOT better sounding than a proper bass reflex with a flared ( on both sides ) tube .
The opposite is true . A passive radiator is only usable if you want a really small box .
2. If using a passive filter as I suggested , there are some benefits .
A mini dsp gonna delay the signal and the delay is bigger if using high order crossover topology . Crossing at 100 Hz with minidsp and 24 dB linkwitz Riley filtering with no HP filtering for the metas gonna delay the signal to the subwoofers and you will hear it . If you want to cross the Ls50 with minidsp and use HP filtering with minidsp and thus avoid the delay, the minidsp is not transparent enough .
The passive approach that I suggest ( one big Aircoil for each subwoofer, one capacitor in series with each Kef ) is working really good If you use the subwoofer as a stand to each ls50 , and If you have a separate power amplifier in stereo for the separate subwoofer stands .
You can get inspiration from KEFs own R3 .
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