Difference between revisions of "L1® Model II Power Stand / Bass Line Out"
m (link to Activating B1 EQ Curves) |
m (180 Hz is 200 Hz for Model II) |
||
Line 3: | Line 3: | ||
<table><tr> | <table><tr> | ||
<td valign="top" width="250">__TOC__ | <td valign="top" width="250">__TOC__ | ||
− | Most of the information here was originally written for the {{Classic}} and {{Model I}}. I have verified with MikeZ-at-Bose, that this is applicable to the {{Model II}} as well. There is a little more detail about the {{Model II}} crossover at the end. [[User:ST|ST]] | + | Most of the information here was originally written for the {{Classic}} and {{Model I}}. I have verified with MikeZ-at-Bose, that this is applicable to the {{Model II}} as well except that the crossover point is 200 Hz. The Classic/Model I crossover is 180 Hz. There is a little more detail about the {{Model II}} crossover at the end. [[User:ST|ST]] |
</td> | </td> | ||
<td valign="top">[[Image:ModelIIBassOutputs.png|Model II Bass Outputs]] | <td valign="top">[[Image:ModelIIBassOutputs.png|Model II Bass Outputs]] | ||
Line 17: | Line 17: | ||
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. | 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. | ||
− | '''Note''' all the references to | + | '''Note''' all the references to 200 Hz below may actually be 200 Hz. We are just waiting for MikeZ-at-Bose to confirm one way or the other. |
=== Without Bass Line out === | === Without Bass Line out === | ||
− | * 1 x B1: 40Hz- | + | * 1 x B1: 40Hz-200Hz, B1 specific EQ, some nominal gain that we call 0dB |
− | * 2 x B1: 40Hz- | + | * 2 x B1: 40Hz-200Hz, B1 specific EQ, -6dB as compared to nominal |
=== With Bass Line Out === | === With Bass Line Out === | ||
− | * 0 x B1 connected to Power Stand: 40Hz- | + | * 0 x B1 connected to Power Stand: 40Hz-200 Hz, flat, roughly the same gain as 2 B1 |
− | * 1 x B1 connected to Power Stand: 40Hz- | + | * 1 x B1 connected to Power Stand: 40Hz-200Hz, B1 specific EQ, -6dB as compared to nominal |
** If you use a {{A1 EB}} this is a total of 3 B1s | ** If you use a {{A1 EB}} this is a total of 3 B1s | ||
− | * 2 x B1 connected to Power Stand: 40Hz- | + | * 2 x B1 connected to Power Stand: 40Hz-200Hz, B1 specific EQ, -12dB as compared to nominal |
** If you use a {{A1 EB}} this is a total of 4 B1s | ** If you use a {{A1 EB}} this is a total of 4 B1s | ||
Line 44: | Line 44: | ||
== {{Model II}} Crossover {{L1 CR}} == | == {{Model II}} Crossover {{L1 CR}} == | ||
− | There is no change in crossover frequency for the Cylindrical Radiators® depending on the presence/absence of | + | There is no change in crossover frequency for the Cylindrical Radiators® depending on the presence/absence of {{B1}}s attached to the Bass Module output. This is due to the design change (Cylindrical Radiator® is not ported whereas Classic and Model I are.) The {{Model II}} is designed to always be used with at least one B1, whereas the {{Model I}} / {{Classic}} was designed to used with or without a {{B1}}. |
Line 51: | Line 51: | ||
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 | + | Output if no {{B1}}s detected |
− | * 40- | + | * 40-200 Hz Bandpass (that is: NO B1 EQ) |
− | If one or two | + | If one or two {{B1}}s detected (or resistors used across NL4 2+ / 2- pins to emulate detection) |
− | * 40- | + | * 40-200 Hz with different EQ curves |
− | For details on how to do this see: [[Activating B1 EQ Curves]] | + | For details on how to do this see: [[Activating B1 EQ Curves]] and [[Using a Different Sub]] |
<noinclude> | <noinclude> |
Revision as of 03:54, 16 October 2007
ContentsMost of the information here was originally written for the L1 Classic and L1 Model I. I have verified with MikeZ-at-Bose, that this is applicable to the L1 Model II as well except that the crossover point is 200 Hz. The Classic/Model I crossover is 180 Hz. There is a little more detail about the L1 Model II crossover at the end. ST |
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.
Note all the references to 200 Hz below may actually be 200 Hz. We are just waiting for MikeZ-at-Bose to confirm one way or the other.
Without Bass Line out
- 1 x B1: 40Hz-200Hz, B1 specific EQ, some nominal gain that we call 0dB
- 2 x B1: 40Hz-200Hz, B1 specific EQ, -6dB as compared to nominal
With Bass Line Out
- 0 x B1 connected to Power Stand: 40Hz-200 Hz, flat, roughly the same gain as 2 B1
- 1 x B1 connected to Power Stand: 40Hz-200Hz, B1 specific EQ, -6dB as compared to nominal
- If you use a PackLite® power amplifier model A1 Extended Bass Package this is a total of 3 B1s
- 2 x B1 connected to Power Stand: 40Hz-200Hz, B1 specific EQ, -12dB as compared to nominal
- If you use a PackLite® power amplifier model A1 Extended Bass Package this is a total of 4 B1s
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.
L1 Model II Crossover L1 Cylindrical Radiator® loudspeaker
There is no change in crossover frequency for the Cylindrical Radiators® depending on the presence/absence of B1 Bass Modules attached to the Bass Module output. This is due to the design change (Cylindrical Radiator® is not ported whereas Classic and Model I are.) The L1 Model II is designed to always be used with at least one B1, whereas the L1 Model I / L1 Classic was designed to used with or without a B1 Bass Module.
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
- 40-200 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)
- 40-200 Hz with different EQ curves
For details on how to do this see: Activating B1 EQ Curves and Using a Different Sub
- ↑ Hilmar-at-Bose A1 PackLite Questions and More Bass Talk
- ↑ Hilmar-at-Bose Third Party Woofers
- ↑ Hilmar-at-Bose Third Party Subwoofers