PS1 Powerstand

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

PS1 Powerstand

How to Tell the Difference Between L1 Models

This is how to tell which L1® unit you have.

 
2003 - 2007 Classic30.pngRounded front. The Output Panel has Amp1 Out, Amp2 Out, Amp3 Out
2007 - 2012 ModelI30.pngRounded front. The Output Panel has no outputs for Amp1, Amp2, Amp3.
The Output Panel and L1 Cylindrical Radiator® loudspeaker sections have orange L1® markers.
2012 - Present MII32.pngExtending legs, one Cylindrical Radiator® (Top Array), Bottom Extension
2007 - Present MII32.pngExtending legs, two Cylindrical Radiator®s, Bass Line Out,
2003 - Present B1 Bass ModuleUp to two per Power Stand (above). More if using the PackLite® power amplifier model A1. 2 x 5.25" drivers, 26.6 lb
2012 - Present B2 Bass ModuleUp to one per Power Stand (above). More if using the PackLite® power amplifier model A1. 2 x 10" drivers 45 lb. 3 position switch.
2005 - Present  Allows bass expansion for L1® Classic L1® Model I L1® Model II (not L1® Compact not L1® Model 1S)
2007 - Present T1® ToneMatch Audio EngineT1 ToneMatch Audio Engine
2009 - Present L1® CompactIntegrated Power Stand and Bass Unit, two Extensions
2015 - Present F1 Model 812 and F1 SubwooferFlexible Array Loudspeaker

Connections

Classic This information is applicable to the L1® Classic

What do the LEDs mean?

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


Signal/OL LEDs: Channels 1 and 2

SignalOLLED.png

There are two LEDs on the PS1 Power Stand (Classic) / Model I near the Trim knob labelled Signal/OL -- one for Channel 1 and another for Channel 2.

These LEDs indicate when the signal level channel's preamplifier reaches certain important thresholds. The trim controls located near the LEDs adjust the amount of gain in the preamplifier.

The LEDs turn from off → green when the signal level exceeds a small amount.
The LEDs turn from green → red when the signal reaches a level that's about 10 dB below a level that would clip the preamp and cause objectionable distortion.

When the LED is off (but you are playing an instrument you think is connected to the PS1 or singing/talking into a microphone you think is connected): Increase the level of the trim control. If the LED still does not turn green or red, check instrument/microphone and cables to the PS1.

When you see green only: This indicates that there's some signal in the channel but not enough. While singing or playing the loudest you ever plan to in the performance, increase the trim level until the LED is only flickering red. This is the optimal gain.

When you see red most of the time: Decrease the trim level until you see only flickering red. This is the optimal gain.


Phantom Power LEDs: Channels 1 and 2

Phantom Power LED and Switch

The LEDs near the Phantom Power button are either off or red when phantom power is turned on. — more information about Phantom Power

Power / System Status LED

This LED normally is a steady green when the power is on.

Power LED

If it is not lit or if it is yellow/amber, contact Support.

Note: This LED may briefly flicker yellow /amber when the power is first turned on; this is normal. Within a couple of seconds, it should settle to a steady green.


This Page Reviewed By Bose



Bass Line Out and B1 behavior

Model I right side Input/Output panel


The behavior of the bass line out and B1 Bass Module outputs on the L1® Classic / L1® Model I / L1® Model II are based on the philosophy that adding B1 Bass Modules should give the user more dynamic range (can play louder) but should not alter the tone of the instrument, including tone adjustments made using the R1 Remote, the T1 ToneMatch Audio Engine or other tone-shaping equipment.

This philosophy is notably different from other manufacturers, who take the approach that it's okay (or desirable) that adding more bass speakers causes the instrument tone to become "bassier".

With this philosophy in mind, here is how the bass line out and B1 outputs work.

No cable plugged into the Bass Line out

B1s connected OutputEQ Bass Signal Gain Notes
1 40Hz-180Hz B1 specific EQ Reference Level
2 40Hz-180Hz B1 specific EQ Reference Level -6 dB Why? Because when you add a second B1, if you did not change the signal strength you would get 6 dB more bass relative to the mids and highs. This would alter the tone of the instrument. To keep the tone the same, while still allowing the more dynamic range (system can play louder by 6 dB) the signal level must be reduced by 6 dB.


Cable connected to the Bass Line Out

B1s connected OutputEQ Bass Signal Gain Notes
0 40Hz-180Hz Flat EQ Reference Level -6 dB
1 40Hz-180Hz B1 specific EQ on Bass Line Out and B1 Out Reference Level - 6 dB If you are using a PackLite® power amplifier model A1 Extended Bass Package this is a total of 3 B1s (2 on the A1 and 1 on the Power Stand)
2 40Hz-180Hz B1 specific EQ on Bass Line Out and B1 Out Reference Level -12 dB If you are using a PackLite® power amplifier model A1 Extended Bass Package this is a total of 4 B1s (2 on the A1 and 2 on the Power Stand)

With More Than 4 B1s

The Power Stand does not measure the exact number of PackLite® power amplifier model A1s, 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 heavy.

B2 EQ

Bass Line Out: Model II post firmware 1.4 with System EQ 1.04

Model II Bass OutputsB2 Bass Level Switch


September 2012

Bose released Model II Power Stand Model II firmware 1.4 with System EQ 1.04 to support the B2 Bass Module with the three position Bass Level Switch ( + Normal - ). Note: Support and behaviors for B1(s) is unchanged.
The behavior of the bass line out with the B2 Bass Module Bass Module outputs on the Model 1S and Model II are based on the philosophy that adding B2 Bass Modules should give the user more bass output immediately. This changes the tonal balance as soon as you add a second B2 using an PackLite® power amplifier model A1 connected to the Bass Line Out. This is unlike the behaviour with B1 bass modules where the signal is attenuated as you add more B1s to maintain the tonal balance at lower volume levels.
Note: If no bass modules are detected at the Bass Module Output the Bass Line Out EQ will be set to the B2 curve with the B2 switch set to Normal.
— Source Craig-at-Bose

No cable plugged into the Bass Line out

B2 Bass Modules connected Output EQ Bass Signal Gain Notes
1 40Hz-200Hz B2 specific EQ as set by the B2 Bass Level Switch ( + Normal - ) is present at the Bass Module Out and the Bass Line Out Reference Level There are three B2 EQ settings possible using the B2 Bass Level Switch ( + Normal - )

Cable connected to the Bass Line Out

B2 Bass Modules connected Output EQ Bass Signal Gain Notes
0 40Hz-200Hz B2 EQ as though B2 attached and B2 Bass Level Switch set to Normal position Reference Level This presents the B2 EQ with the B2 Bass Level Switch set to the Normal position. (No resistance detected between the 2+ and 2- pins of an NL4 plug)
1 40Hz-200Hz B2 specific EQ as set by the B2 Bass Level Switch ( + Normal - )
is present at the Bass Module Out and the Bass Line Out
Reference Level If you are using a PackLite® power amplifier model A1 Extended Bass Package this is a total of two B2s (one on the A1 and one on the Power Stand)

Powered Subwoofers

The Model II is an integrated system that supports Bose B1 and B2 bass modules. Connecting powered subwoofers to the Model II Power Stand Bass Line Out is not supported because EQ curves for the B1 or B2 are present at the Bass Line Out. This may or may not result in good results with a powered subwoofer.

If you want to use a powered subwoofer, connect your signal source to the subwoofer and connect the subwoofer high pass filter output to the L1® (any model).

Output if no B1 Bass Modules detected at the Bass Module Output (powered output) the signal at the Bass Line Out is:

  • 40-180 Hz with B2 EQ applied if you have the current L1® Model II Power Stand Firmware Updates
    • If you do not have the current firmware the signal at the Bass Line Out is: 40-180 Hz Bandpass (that is: NO B1 EQ) [1]
  • The system Crossover for the Cylindrical Radiator®s is 180 Hz

If one or two B1 Bass Modules is detected or emulated using resistors across NL4 2+ / 2- pins

  • 40-180 Hz with different EQ curves
  • The system Crossover for the Cylindrical Radiator®s is 180 Hz

For details on how to do this see: Activating B1 EQ Curves and Using a Different Sub


Note — Operation of the B2 with the Model I/Classic is only supported with the B2 Bass Level Switch set to Normal.
See: Is the B2 Bass Module Compatible with the L1® Classic or Model I


Bass Module Output (powered output)

For the sake of those attaching third party passive speakers (an unsupported application), the output characteristics are the same as for the the B2 Bass Module (section immediately above).



  1. Hilmar-at-Bose intelligent crossover
    A) When there are no bass sources attached, lower the crossover and try to get as much bass out of the L1 as is reasonably feasible (110 Hz) in this case
    B) If there are bass sources bring the crossover up to 180 Hz (where the L1 starts to get really efficient) AND adjust the bass gain so that the overall spectral balance is maintained no matter how many bass sources are attached.


Original Source - Hilmar-at-Bose




Use the proper cables

Warning - Use Blue B1 Cables NL4 cables with your L1® Classic / L1® Model I / L1® Model II

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

If you are using a B1 Bass Module with your Power Stand it is ESSENTIAL for proper operation that you use the BLUE B1 cables supplied with the B1 Bass Module. This is required so that the L1® Classic or L1® Model I or L1® Model II Power Stand can correctly identify when there are B1 Bass Modules connected to it and if so, how many.

B1 Cable


Please click the picture above for ordering information.

See: PS1 Power Stand / Bass Line Out for details about how the Power Stand adapts to the number of B1 Bass Modules that are connected to it.

You may also use high quality NL4 cables (four conductor cables). Alternate and longer cables for B1s




Crossover

If you don't plug in a B1 and connect a powered sub to the bass line out, the cross over will be at 180 Hz and the "Bass Line Out" will deliver a flat 40Hz to 180 Hz signal. The 110 Hz is only used when there is no B1 AND nothing connected to the "Bass Line Out". In this case we assume that the L1s have to provide full bandwidth to the best of their ability.[1]


Phantom Power

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

Hilmar-at-Bose posted a great message about phantom power (and why the Bose system is 24 volts)[1].

Let me add some technical ramblings to the 48/24 discussion. Condenser microphones require phantom for a couple of reasons

a) power an internal pre-amp

b) supply polarization voltage to the capsule

c) run an internal DC-DC converter that in turn fuels either preamp, capsule or both

Most condenser mics fall in category a). In this case, reducing the phantom from 48V to 24V has virtually no effect. In theory you can get higher voltages out of a 48V supply, but at this point you would clip the input of you mic preamp anyway.

In category b), the effect of dropping the phantom is that the overall sensitivity of the mic goes down by 6 dB. On the other hand, the max SPL goes up by 6dB. In general, you will simply have to turn up the trim a little more, but there shouldn't be any other effects.

Case c) is basically hit or miss. Either it works just fine or it doesn't work at all. I don't think there is any in-between.

Again, most mics these days fall in category a) and that's one of the reason why the the International Engineering Consortium (IEC) in it's standard 61938 (1996) in section 7.4.5. explicitly recommends

quote: Although 12V and 48V systems are still in use, 24V systems are preferred for new developments

and that's why we've chosen 24V.


Leaving it in the bag

It is okay to do this if you like (and personally I find it a lot quicker for setup/teardown)

Heat

Hilmar-at-Bose speaks about the heat [2]

The PS1 does have fans, but they are only kicking in when you work the system pretty hard. The power amps are very efficient, and a nice side effect of high efficiency, is that there is a lot less heat to get rid off. So unless you are hitting it very hard, the fans will be off and at that kind of volume level, the fans are pretty much inaudible.

Leaving the system inside the bag is perfectly fine. The vents are above the mixer section and if the bag is open enough so you an insert any cables, than its also open enough to get appropriate ventilation.

If possible you should avoid exposing the PS1 (or any kind of electronics for that matter) to direct blazing sunlight. That can generate enormous amounts of heat inside the system to the point where it actually has to shut down (to protect some of the internal components). As a general rule, if it's too hot for you as the performer, than it's probably also too hot for the system. Finding a little shade will certainly help in a scenario like this.


Access Door / Flip Up Panel

Cliff-at-Bose talks about the door [3]

"I took my cover off right away and couldn't even tell you where it is right now. The carry bag for the PS1 seems to do a good job of keeping things clean in storage, the trunk, in transit. For the upper L1 section, turn it upside down, grab it by the bayonet, lower it into the bag and the bayonet should tuck into the top just fine.

Preventing Incorrect Connections

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

Cover Unused Inputs

To avoid mishaps at a gig cover or plug the unused inputs on your PS1 Powerstand. This picture shows white nylon caps in the lesser used inputs of a L1® Classic Powerstand. The L1® Model I does not have the inputs in the white area near the top right.

Bosewplugsr640.png

Here is a link to the full sized version of the image.

This tip is from Dan Cornett - see Dan's original tip about plugs for unused inputs


No Sound

Damaged Connections in the L1® boot

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

Inspecting for damaged connectors in the PS1 Powerstand boot.

Image2%5B1%5D.jpg

Obstructions in the L1® boot

Classic This information is applicable to the L1® Classic

Look down the well - Thanks to Joseph for this one [4]

Set up my Bose as usual just before an early gig tonight and except for the sub-woofer (B1 Bass Module), there wasn't any sound coming out from the line array when plugging in the guitar directly (without the usual PODxt Live in front of it).

Whool! I was definitely started to freak... I surely didn't want to pull my van around again and have to get out the Roland Keyboard back-up amp.

The anguish I was going through just imagining having to use anything other then the Bose was excruciating.. to think that I might have to play the next run of back to back gigs (five of 'em to be exact) without my baby Bose...:-(

Trouble shooting all possibilities, nothing-nada was happening ... no beauteous guitar sound whatsoever!...

The one thing I did notice however, was that the pole was wobbling just a tiny bit. Whenever I would take it apart and put it back together again, there seemed to be the slightest, almost imperceptible of wobbles.

Finally, after taking it apart and putting it back together again for the third time I looked into the power base (PS1 Power Stand (Classic) / Model I) fitting and saw one of my picks lying there. Sure 'nuff... the pick was blocking the connection. This thin little pick was just enough to prevent the Bose from making full contact.

So be forewarned guitarists ... stray picks can be a threat to your total Bose sound fulfillment.

More Troubleshooting

Please see: Troubleshooting

Liquids

Hilmar-at-Bose [5] The best way to deal with a beverage accident is to

  1. Please, shut the system of immediately (liquid in the PS1 is a potential safety hazard)
  2. If you have the opportunity pour clear water after the beverage (to rinse out sticky stuff)
  3. wiggle a little to make sure all the water comes out of the drain holes in the bottom.
  4. Let the system dry out throroughly for at least one day, several days are better


Battery Power

Hilmar-at-Bose tells us that battery power is not recommended [6]

A sufficiently sized generator will work with our system although they tend to be fairly noisy.

Car battery converters (so called "inverters") are a little problematic. Most inverters don't work well with our highly-efficient Switch Mode Power Supplies and need to be 2 to 3 times oversized. That draws really big amounts of current from the car battery and the wiring from the battery to the inverter needs to be able to handle that. This is by no means a trivial job, so we recommend against it.