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

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Revision as of 11:42, 15 March 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 B1s detected

  • 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)

  • 40-180 Hz with different EQ curves

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