Difference between revisions of "Template:L1® Classic, Model I, and Model II Acoustical Output"

From Bose Portable PA Encyclopedia
Jump to: navigation, search
m
 
(5 intermediate revisions by the same user not shown)
Line 2: Line 2:
 
The maximum output volume of the {{Classic}}, the {{Model I}}, and the {{Model II}} are virtually identical.
 
The maximum output volume of the {{Classic}}, the {{Model I}}, and the {{Model II}} are virtually identical.
  
−
In the {{Classic}}, the {{L1 CR}} is powered by two (2) 250 Watt amplifiers. In the Model I and Model II, the {{L1 CR}} is powered by one (1) 250 Watt amplifier. The Classic, the Model I, and the Model II all use a second 250 Watt amplifier to power one or two B1 bass modules.
+
In the {{Classic}}, the {{L1 CR}} is powered by two (2) 250 Watt amplifiers. In the Model I and Model II, the {{L1 CR}} is powered by one (1) 250 Watt amplifier. The Classic, the Model I, and the Model II all use a second 250 Watt amplifier to power one or two B1 bass modules (update: or a single B2 Bass Module).
  
−
Although these numbers serve as a point of reference they do not tell the whole story. During the design of the {{Model I}} and the {{Model II}} the impedance of the {{L1 CR}} was lowered. As a result of the lower impedance, a single 250W amplifier now powers the system to within 1.75 dB of the max [[SPL|Sound Pressure Level]] of the {{Classic}}. Several other changes were made to the signal processing and acoustical sections to further reduce this small difference. Particular attention was paid to this change and many A/B comparisons were conducted by Bose to confirm that there was no significant audible difference between the two systems.  
+
Although these numbers serve as a point of reference they do not tell the whole story. During the design of the {{Model I}} and the {{Model II}} the impedance of the {{L1 CR}} was lowered. As a result of the lower impedance, a single 250W amplifier now powers the system to within 1.75 dB of the max SPL of the {{Classic}}. Several other changes were made to the signal processing and acoustical sections to further reduce this small difference. Particular attention was paid to this change and many A/B comparisons were conducted by Bose to confirm that there was no significant audible difference between the two systems.  
  
−
— Source: [[Template talk:L1® Classic, Model I, and Model II Acoustical Output|Neil-at-Bose]]
 
  
−
 
+
— Source: [[Template talk:L1® Classic, Model I, and Model II Acoustical Output|Ken-at-Bose, Neil-at-Bose]]
−
 
 
−
 
 
−
<html>
 
−
<blockquote>
 
−
The difference between 500 Watts and 750 Watts is 1.75 dB. This is barely audible, if we did nothing to improve the efficiency. But we did! We made up the difference through tweaking the impedance of the driver and a few other subtle adjustments in the power amps.
 
−
<br />
 
−
I was probably the most rigorous in making the engineering team prove to me that we were at parity with the Classic -- that any differences were negligible. I was completely convinced of this as were others on the team.
 
−
<br />
 
−
I don't know what's going on exactly in the setups you're comparing. But to resolve any difference, you're starting by splitting hairs (1.75 dB) and working to even more subtle differences given the gains we got in efficiency.
 
−
 
 
−
</blockquote>
 
−
 
 
−
<br />
 
−
Source &mdash; <a href="http://bose.infopop.cc/eve/forums/a/tpc/f/3976055944/m/5271022035?r=7991022035#7991022035">Ken-at-Bose</a>
 
−
<br />
 
−
</html>
 
−
 
 
−
 
 
−
<html>
 
−
<blockquote>
 
−
The two amps in the Classic power stand that drive the two sections of the Classic Cylindrical Radiator speaker are capable of delivering 500 Watts, but because of the exact impedance of the speakers, they actually deliver 370 Watts.
 
−
<br />
 
−
 
 
−
In contrast, the single amplifier in the Model I power stand that drives both sections of the Model I Cylindrical Radiator speaker is capable of delivering 250 Watts and delivers the full 250 Watts when needed.
 
−
<br />
 
−
 
 
−
This amounts to a difference of 1.7 dB = 10 * Log (370/250).
 
−
<br />
 
−
 
 
−
(Note that in both the Classic and the Model I a separate 250 Watt amplifier is dedicated to powering one or two B1s.)
 
−
<br />
 
−
 
 
−
I realize that these further details do not resolve the different experiences being reported. I do feel, however, that they may provide some additional clarity to those that are interested in learning more.</blockquote>
 
−
<br />
 
−
 
 
−
<br />
 
−
Source &mdash; <a href="http://bose.infopop.cc/eve/forums/a/tpc/f/3976055944/m/5271022035?r=2661004235#2661004235">Ken-at-Bose</a>
 
−
<br />
 
−
</html>
 
 
<noinclude>
 
<noinclude>
 
----
 
----

Latest revision as of 15:19, 26 March 2017

This Page Reviewed By Bose

The maximum output volume of the L1 Classic, the L1 Model I, and the L1 Model II are virtually identical.

In the L1 Classic, the L1 Cylindrical Radiator® loudspeaker is powered by two (2) 250 Watt amplifiers. In the Model I and Model II, the L1 Cylindrical Radiator® loudspeaker is powered by one (1) 250 Watt amplifier. The Classic, the Model I, and the Model II all use a second 250 Watt amplifier to power one or two B1 bass modules (update: or a single B2 Bass Module).

Although these numbers serve as a point of reference they do not tell the whole story. During the design of the L1 Model I and the L1 Model II the impedance of the L1 Cylindrical Radiator® loudspeaker was lowered. As a result of the lower impedance, a single 250W amplifier now powers the system to within 1.75 dB of the max SPL of the L1 Classic. Several other changes were made to the signal processing and acoustical sections to further reduce this small difference. Particular attention was paid to this change and many A/B comparisons were conducted by Bose to confirm that there was no significant audible difference between the two systems.


— Source: Ken-at-Bose, Neil-at-Bose

Retrieved from "https://toonz.ca/bose/wiki/index.php?title=Template:L1®_Classic,_Model_I,_and_Model_II_Acoustical_Output&oldid=18492"