L1 Model II

Let's talk about the L1® Portable Line Array Systems

Using proprietary Bose® technology, L1 systems combine  PA and monitors into a single, highly portable unit. The  loudspeaker can be positioned behind or to the side —and you hear what the audience hears.

Highly portable PA and monitor combined for solo performers, DJs and general-purpose use. Fixed vertical control with 180° horizontal coverage Reduced vulnerability to feedback.

Three systems to choose from (Compact, Model 1S, Model II)
Two passive bass module options (B1 or B2)
Consistent coverage and tonal balance, portability and easy setup.

Preamps

Mike Z, in regards to preamps, wrote
quote:
Yes, on the model I they're exactly the same as the Classic.

On the T1(tm) they're different, but are designed to the same standard as the Classic pre's.


Could you please explain how they are different.

Robert L
Functionally they are basically the same in terms of frequency response, input impedance, noise performance, max gains etc.

The difference comes in how we get there. Ill try not to go into horribly boring detail. The name of the game is tradeoffs, and in the end the design constraints dictate the *best* type of circuit used for *this* particular situation. Here are a couple of the many factors that dictate the differences:

Gain structure. The internal components of the T1(tm) are different that the model I/Classic and need to have signals fed to them in certain ways. Diffrerent designs are more suited to the levels needed than others.

Physical layout of the circuit on the board. There are four channels in a tighter space in the T1(tm). Again, certain designs lend themselves to be better at this than others.

After evaluating all of the factors that go into the design of a preamp we are using another proven circuit that relies more on discrete transistors rather than op-amps. It fits our needs better for this design situation. The preamp design itself is not necessarily any better or worse. There are *many* ways to skin the cat of preamp design to achieve a desired performance.

Will it sound different? No...I certainly cannot hear a difference playing through it. Can't measure one either.

Hope this sheds some light on it,
MikeZ
another question on these preamps if i may in the T1.
first in most situations i find setting the trims on the classic pretty straight forword. Albeit if they are set too low, one does get that pumping type of effect if the green light is allowed to go on and off at all. Is this a direct result of the Op amp you describe in the design of the classic pres? Like when a signal is just on the threshold, maybe as an end of a note that gradually descends in volume at the end of a sustain. usually noted at quieter gigs.
Just wondering if the transistors used in the T1(transister) preamps are more forgiving, and maybe treat these type of signals with a gentler rolloff, and also the reason for the response being better in the controls of th T1, and negating the lag in the original remote.
usually in most situations it wouldnt be noticeable. but if one seems to have a loud part in a performance and sets the trim accordingly, but then wants to play a very soft part, its where it usually shows up. I am guessing some slight compression would solve this, but just curious if one wasnt or doesnt use compression if the pres react any different in the T1.
hmmm, wfs, im not familiar with the pumping you are desrcribing. I have never experienced it. Can you describe it a bit more in detail, maybe there is something else going on here?

As a musician, I do not notice any difference in how the preamps in the T1(tm) and the Classic/model I operate sound wise.

They do have a different LED readout. On the T1(tm) there's a green to indicate signal, yellow to indicate a good level, and red to signal turn down. The Classic only has red and green.

On the classic a little red is OK, on the T1(tm) it means you are running the trim too high.

MikeZ
well when i first got the system, and also had tried another ( was thinkin maybe doin stereo) they both seemed to do it. I first noticed it when running preprogrammed music through the system...if the levels(trims) were not set high enough, the music would almost sound as if a compressor was set improperly...and the volume would kinda go in and out at ya. once the level was up a bit more on trim it would disappear. But if you would play preprogrammed music and set the trims to where the green light would go off and on and not stay lit all the time the system acted as if it kinda dropped the signal a bit and then when the green light came back on, one would hear the little volume changes from when the green was on or off.
I chalked it up the preamps being kinda digital as with the way the tone controls and volume worked on the remote, thought it was like a small delay in the signal getting reognized as it would rise and fall with the green on and off. I have never noticed it on regular analog mixer amps. the signal would just be less strong, but not a noticeable kinda letting go of the signal if the gains were not set just perfect in their stageing.
if i set the trims now on the classic till i get some red , but not consistant, it seems to not happen very often....maybe only if there is a really significant change in the dynamics of my playing.
I now tend to use my ears and not the leds, as one can hear the distortion if its set to high. I just run the master really low till i hear the distortion just start, then back the trim a bit and all is good. then use volumes as necessary.
but it does seem that on the classic, if the trims arent set just so, it does have some artifacts other than just not giving one the best signal to noise ratio.
As i said, on any other mixer i have ever used, even if one was way off on their gain staging, all that was really sacrificed was the signal to noise ratio. but even at the worst gain staging scenarios i never heard the signal tend to kinda drop off a bit....it doesnt disappear altogether, just sounds as if someone is like messing with a volume control and turning it up and down a little bit....its what i have described as the pumpmping in the other post. just seems with the classic its very sensitive to setting the proper gain, maybe with the 3 leds and not the 2 it smooths it out on the new T1.
So i was just wondering if the transistors vs. the op amps may have somethin to do with the difference.....as hilmar i believe said there is very little lag in the controls of the T1....not noticeable as in the original remote.

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