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<blockquote data-quote="John Roberts" data-source="post: 114118" data-attributes="member: 126">Re: NAMM 2014 reportI think i already said that but the unfortunate reality is that passive crossovers are pretty much inferior to all but the worst active crossovers (a lousy engineer can screw up anything including an active crossover.). The short list of advantages for active crossovers is 1) better initial accuracy (crossover tuning does not depend on driver impedance). 2) less crossover point shift with use (from drivers and components heating up). 3) improved driver control (like damping) from driving each driver directly from a low impedance source. With passive XO the XO is in series with some of the drivers. 4) ability to execute more complex (better) crossover filters, (Steeper filters with simple active crossovers, incredibly complex filters including delay, phase, etc compensation with DSP).&nbsp;&nbsp; 5) Ability to monitor driver state and back off power if appropriate (this is possible with passive XO too, but passive systems are cruder so less effective, and less graceful). 6). etcI would use a D&amp;B box if someone gave them to me***.I find that I am often at odds with popular opinion (like recent presidential elections). :-( JR*** actually I am more of a designer than user of such things, so please nobody send me D&amp;B boxes. While I am not literally a big dog speaker designer and don&#039;t pretend to be, I do trust my judgement about how things work, just like about every customer. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":-)" title="Smile&nbsp; &nbsp; :-)"&nbsp; data-smilie="1"data-shortname=":-)" /></blockquote>

[QUOTE="John Roberts, post: 114118, member: 126"] Re: NAMM 2014 report I think i already said that but the unfortunate reality is that passive crossovers are pretty much inferior to all but the worst active crossovers (a lousy engineer can screw up anything including an active crossover.). The short list of advantages for active crossovers is 1) better initial accuracy (crossover tuning does not depend on driver impedance). 2) less crossover point shift with use (from drivers and components heating up). 3) improved driver control (like damping) from driving each driver directly from a low impedance source. With passive XO the XO is in series with some of the drivers. 4) ability to execute more complex (better) crossover filters, (Steeper filters with simple active crossovers, incredibly complex filters including delay, phase, etc compensation with DSP). 5) Ability to monitor driver state and back off power if appropriate (this is possible with passive XO too, but passive systems are cruder so less effective, and less graceful). 6). etc I would use a D&B box if someone gave them to me***. I find that I am often at odds with popular opinion (like recent presidential elections). :-( JR *** actually I am more of a designer than user of such things, so please nobody send me D&B boxes. While I am not literally a big dog speaker designer and don't pretend to be, I do trust my judgement about how things work, just like about every customer. :-) [/QUOTE]

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