PS1 Powerstand
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Connections
- Interactive view of the connections
- PS1 Powerstand Connections
- PS1 Powerstand/Signal Flow for information about how your input signal flows through the PS1 Power Stand (Classic) / Model I
- Preventing Incorrect Connections
What do the LEDs mean?
Signal/OL LEDs: Channels 1 and 2
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
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.
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.
Bass Line Out and B1 behavior
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 | Output | EQ | 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 | Output | EQ | 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 -6 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 4 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.
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
- 40-180 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)
- 40-180 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 speaks about the heat in the Bose® Musicians Community Message Boards
- ↑ Cliff-at-Bose talks about the door in the Bose® Musicians Community Message Boards
- ↑ Thanks to Joseph for this one in the Bose® Musicians Community Message Boards
- ↑ Hilmar-at-Bose: Posted Fri July 07 2006Spillage in the Bose® L1® Systems Users Forum
- ↑ Hilmar-at-Bose talks about battery power in the Bose® Musicians Community Message Boards
Phantom Power
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 [1]
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 [2]
"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
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.
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
Obstructions in the L1® boot
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 [4] The best way to deal with a beverage accident is to
- Please, shut the system of immediately (liquid in the PS1 is a potential safety hazard)
- If you have the opportunity pour clear water after the beverage (to rinse out sticky stuff)
- wiggle a little to make sure all the water comes out of the drain holes in the bottom.
- 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 [5]
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.
- ↑ Hilmar-at-Bose speaks about the heat in the Bose® Musicians Community Message Boards
- ↑ Cliff-at-Bose talks about the door in the Bose® Musicians Community Message Boards
- ↑ Thanks to Joseph for this one in the Bose® Musicians Community Message Boards
- ↑ Hilmar-at-Bose: Posted Fri July 07 2006Spillage in the Bose® L1® Systems Users Forum
- ↑ Hilmar-at-Bose talks about battery power in the Bose® Musicians Community Message Boards
Categories: Bose Reviewed | A1 PackLite® | PS1 Powerstand | Classic | Model I | Model II | Bass | B1 | L1® System
