Crossover: Difference between revisions
Applicability to different models |
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The following is based on information that was available when the {{Classic}} was in production. This information is equally applicable to the {{Model I}}. The {{Model II}} crossover is fixed at 200 Hz and does not vary depending on whether or not {{B1}}s are attached to the Power Stand. | The following is based on information that was available when the {{Classic}} was in production. This information is equally applicable to the {{Model I}}. The {{Model II}} crossover is fixed at 200 Hz and does not vary depending on whether or not {{B1}}s are attached to the Power Stand. | ||
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===Crossover —Definition === | ===Crossover —Definition === | ||
; I'm familiar with the term 'crossover,' but not really with its meaning. | ; I'm familiar with the term 'crossover,' but not really with its meaning. | ||
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When there is nothing attached to Amp 3 output (where we normally connect the blue B1 cable) the Powerstand does this: | When there is nothing attached to Amp 3 output (where we normally connect the blue B1 cable) the Powerstand does this: | ||
==== {{Classic}} and {{Model}} ==== | ==== {{Classic}} and {{Model I}} ==== | ||
* Frequencies above 110 Hz are sent to the L1 Cylindrical Radiator™ This is less of a "crossover" and more of a cutoff just because there's no point sending frequencies to the L1 that it can't reproduce. | * Frequencies above 110 Hz are sent to the L1 Cylindrical Radiator™ This is less of a "crossover" and more of a cutoff just because there's no point sending frequencies to the L1 that it can't reproduce. | ||
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Here's a bit more from Hilmar-at-Bose about the really low notes: | Here's a bit more from Hilmar-at-Bose about the really low notes: | ||
[[Bass Frequencies]] | [[Bass Frequencies]] | ||
==== 24db / ocatve ==== | |||
The crossover in the power stand is a pretty steep one, 24dB/octave. So an octave above crossover, the B1's are 24dB down and below crossover the L1's are 24dB down. They get out of each other's way pretty quickly. — Cliff-at-Bose | |||
<ref>Cliff-at-Bose [http://bose.infopop.cc/eve/forums/a/tpc/f/3976055944/m/5956075005?r=8661022632#8661022632 Phasing on the Personalized Amplification System]</ref> | |||
=== More Bass Talk === | === More Bass Talk === | ||
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The first statement is not particularly bothersome. Your auditory system is well calibrated to that. A voice sounds normal because it sounds like what you are used to, not because it has “constant sound energy” or “constant perceived loudness” with frequency. | The first statement is not particularly bothersome. Your auditory system is well calibrated to that. A voice sounds normal because it sounds like what you are used to, not because it has “constant sound energy” or “constant perceived loudness” with frequency. | ||
The second statement is much more trouble. It basically says that if you amplify an acoustic source (even if you do it perfectly), the perceived spectral balance will change. This is a well known effect, and most of our home entertainment systems have actually and “automatic loudness compensation” that changes the system voicing with overall level. We actually contemplated adding this to the Personalized Amplification System™ but after some soul searching we thought it would be too intrusive on the musician. | The second statement is much more trouble. It basically says that if you amplify an acoustic source (even if you do it perfectly), the perceived spectral balance will change. This is a well-known effect, and most of our home entertainment systems have actually and “automatic loudness compensation” that changes the system voicing with overall level. We actually contemplated adding this to the Personalized Amplification System™ but after some soul searching we thought it would be too intrusive on the musician. | ||
The main corrections are at very low levels, and in most practical live music settings, the effect is pretty minor. | The main corrections are at very low levels, and in most practical live music settings, the effect is pretty minor. | ||
As a rule-of-thumb guideline, turn the bass up a notch as you turn the volume down. | As a rule-of-thumb guideline, turn the bass up a notch as you turn the volume down. | ||
== Crossover with Line Out == | |||
{{:Crossover with Line Out}} | |||
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<references/> | <references/> | ||
[[category:Bass]] | [[category:Bass]] | ||
[[ | [[Category:L1® System]] | ||
[[category:Technical]] | [[category:Technical]] | ||
[[category:Terminology]] | [[category:Terminology]] | ||