Difference between revisions of "PS1 Power Stand / Bass Line Out"

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m (setup up labelled section transclude <section begin=Bass Module Output />)
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For the sake of those attaching third party passive speakers (an unsupported application).
 
For the sake of those attaching third party passive speakers (an unsupported application).
  
Output if no B1s detected
+
Output if no {{B1}}s detected
 
* 40-180 Hz Bandpass (that is: NO B1 EQ)
 
* 40-180 Hz Bandpass (that is: NO B1 EQ)
  
If one or two B1s detected (or resistors used across NL4 2+ / 2- pins to emulate detection)
+
If one or two {{B1}}s detected (or resistors used across NL4 2+ / 2- pins to emulate detection)
 
* 40-180 Hz with different EQ curves
 
* 40-180 Hz with different EQ curves
  

Revision as of 00:41, 20 December 2008


Classic This information is applicable to the L1® Classic
L1 Model I This information is applicable to the L1 Model I

Model I right side Input/Output panel

Bass Line Out and B1 behavior

Hilmar-at-Bose[1]. This is based on the design goal that “You should always sound the same; no matter how much Bass stuff is attached” I can try to explain my view of why this is a good design goal (of which you may disagree) but let’s look at the actual behavior first.

Without Bass Line out

  • 1 x B1: 40Hz-180Hz, B1 specific EQ, some nominal gain that we call 0dB
  • 2 x B1: 40Hz-180Hz, B1 specific EQ, -6dB as compared to nominal

With Bass Line Out

What this complex behavior does is the following. No matter if you attach 1, 2, or 4 B1s, you will get pretty much the same balance between all combined B1s and the L1s. It’s a little off for 3, 5, 6, 7 & 8 B1s, but still reasonably close.

It’s true that the user doesn’t have to re-EQ our systems if you add more B1s or even a PackLite with another pair of B1s. But that’s unique to our system, because we were actively measuring the number of B1s attached. So re-EQ is required, but the system is doing it by itself without any user involvement required. [2]


With More Than 4 B1s

A little more insight. [3] We actually can't measure the exact number of PackLites, so there is a slight error if you use anything but 1,2, or 4 B1s. For 6 B1s you will be 3.5 dB bass heavy, for 8 B1s it'll be 6 dB. However, these are rare cases, and if you go through the trouble to hook up 8 B1s, I guess you are actually looking for something more bass heavy.

Don't ask how I know.


Bass Module Output (powered output)

For the sake of those attaching third party passive speakers (an unsupported application).

Output if no B1 Bass Modules detected

  • 40-180 Hz Bandpass (that is: NO B1 EQ)

If one or two B1 Bass Modules detected (or resistors used across NL4 2+ / 2- pins to emulate detection)

  • 40-180 Hz with different EQ curves

For details on how to do this see: Activating B1 EQ Curves