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Junior Varsity
X32 Discussion
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<blockquote data-quote="Eric Hill - USA" data-source="post: 60524" data-attributes="member: 2100"><p>re: X32 Discussion</p><p></p><p></p><p></p><p>I can't speak as to what your analog board is doing.</p><p></p><p>That said...</p><p></p><p>The purpose of aux (bus) fed subs is <em>not</em> to have independent direct control of the subs. Nor is the purpose to keep bottom-end out of the tops. The purpose is to keep "non-bottom-end" sources out of the subs. Thus, the subs only have what is specifically being sent to them. The result is a bottom-end that is very clean.</p><p></p><p>For example, the kick and floor toms, bass guitar, keys, and playback could be routed to the subs. We could omit the rest of the drums, guitars, and vocals.</p><p></p><p>However, the bottom-end sources must still be included in the L/R buses, and the mono and L/R must still be treated as a bi-amped (or tri-amped) system.</p><p></p><p>In practical terms:</p><p></p><p>1. Attach a tone generator to a channel, and feed it a stable tone.</p><p>2. Route the channel to the mono buss, and the L/R bus.</p><p>3. Use a volt meter to measure the output of the mono bus.</p><p>4. Measure the output of the L bus.</p><p>5. Measure the output of the R bus.</p><p></p><p>Those three buses need to have the same measured voltage.</p><p></p><p>If the channel level is raised, the outputs must still be equal. If the bass EQ on the channel is raised, the outputs must still be equal. If the L/R bus is raised, somehow the mono bus must also be raised.</p><p></p><p>The mono and L/R buses must track together at all times.</p><p></p><p>On the X32, the M/C bus fader always stays at 0 dB, and the option "M/C bus depends on L/R" is set to on.</p><p></p><p>(As an aside, on the X32, linked channels, like coming from a CD player, are set to -6 dB on the M/C bus. They'll correctly sum.)</p><p></p><p>From there, a crossover on the L/R bus signals is used. A crossover is also used on the M/C bus signal. Delay is set.</p><p></p><p>After all that is setup, if just the M/C bus (or just the L/R bus) levels are independently changed, the crossover point will change.</p><p></p><p>Here’s an excellent article on the entire subject:</p><p></p><p><a href="http://www.prosoundweb.com/article/a_detailed_explanation_of_the_aux_fed_subwoofer_technique/" target="_blank">http://www.prosoundweb.com/article//a_detailed_explanation_of_the_aux_fed_subwoofer_technique/</a></p><p></p><p>Bottom line of what we’re discussing on the X32... The routing is functioning just fine. What's missing is the functionality to do the crossover and delay within the X32. The rough abilities are there, they just aren't precise enough.</p><p></p><p>As an aside, this functionality isn't just about aux (bus) fed subs. The flexible routing in the X32 could be used to bi-amp or tri-amp a system.</p><p></p><p>Eric H.</p></blockquote><p></p>
[QUOTE="Eric Hill - USA, post: 60524, member: 2100"] re: X32 Discussion I can't speak as to what your analog board is doing. That said... The purpose of aux (bus) fed subs is [I]not[/I] to have independent direct control of the subs. Nor is the purpose to keep bottom-end out of the tops. The purpose is to keep "non-bottom-end" sources out of the subs. Thus, the subs only have what is specifically being sent to them. The result is a bottom-end that is very clean. For example, the kick and floor toms, bass guitar, keys, and playback could be routed to the subs. We could omit the rest of the drums, guitars, and vocals. However, the bottom-end sources must still be included in the L/R buses, and the mono and L/R must still be treated as a bi-amped (or tri-amped) system. In practical terms: 1. Attach a tone generator to a channel, and feed it a stable tone. 2. Route the channel to the mono buss, and the L/R bus. 3. Use a volt meter to measure the output of the mono bus. 4. Measure the output of the L bus. 5. Measure the output of the R bus. Those three buses need to have the same measured voltage. If the channel level is raised, the outputs must still be equal. If the bass EQ on the channel is raised, the outputs must still be equal. If the L/R bus is raised, somehow the mono bus must also be raised. The mono and L/R buses must track together at all times. On the X32, the M/C bus fader always stays at 0 dB, and the option "M/C bus depends on L/R" is set to on. (As an aside, on the X32, linked channels, like coming from a CD player, are set to -6 dB on the M/C bus. They'll correctly sum.) From there, a crossover on the L/R bus signals is used. A crossover is also used on the M/C bus signal. Delay is set. After all that is setup, if just the M/C bus (or just the L/R bus) levels are independently changed, the crossover point will change. Here’s an excellent article on the entire subject: [URL="http://www.prosoundweb.com/article/a_detailed_explanation_of_the_aux_fed_subwoofer_technique/"]http://www.prosoundweb.com/article//a_detailed_explanation_of_the_aux_fed_subwoofer_technique/[/URL] Bottom line of what we’re discussing on the X32... The routing is functioning just fine. What's missing is the functionality to do the crossover and delay within the X32. The rough abilities are there, they just aren't precise enough. As an aside, this functionality isn't just about aux (bus) fed subs. The flexible routing in the X32 could be used to bi-amp or tri-amp a system. Eric H. [/QUOTE]
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