Sub1/Sub2

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Training

Firmware Updates

Sub1 Sub2 USB C service port

Version 5.06

May 26, 2021

  • Fixes an issue that allows users to disable Low Power Standby mode.
  • Allows wider range of Standby button press lengths when powering on product.
  • Implements timed audio output mute when powering on product.
  • Updates to green/red signal/clip LED threshold.

Installation

  • Use a USB C cable (click the picture to the right to see where it connects on the Sub)
  • Go to http://btu.bose.com using a PC or Mac
  • Follow the prompts on the screen
  • Instructions

Comparisons Sub1/Sub2 Subwoofers

SpecificationB1B2Sub1Sub2F1 Subwoofer
dB SPL at 1 meter
Continous/Peak
n/a 115 dB (continuous)
121 dB (peak)
118 dB (continuous)
124 dB (peak)
123 dB (continuous)
129 dB (peak)
124 dB (continuous)
130 dB (peak)
Watts RMS
Active/Passive
125
Passive
250
Passive
480
Active
1000
Active
1000
Active
Weight pounds 28 45 35.5 51.7 55
Drivers Two 5.25" Two 10" One 7"x13" RaceTrack One 10"x18" RaceTrack Two 10"
Cardioid Mode n/a n/a Yes Yes n/a
Compatibility with Bose Products L1 Legacy L1 Legacy L1 Pro, L1 Legacy, S1 Pro, L1 Compact L1 Pro, L1 Legacy, S1 Pro, L1 Compact L1 Pro, L1 Legacy, S1 Pro, L1 Compact
Compatibility with non-Bose products No
passive, no low-pass filter
No
passive, no low-pass filter
Yes
active, switchable low-pass filter
Yes
active, switchable low-pass filter
Yes
active, switchable high-pass filter
Two Sub1s or Sub2

Two Sub1s have approximately the same membrane surface area (180 square inches).

The power difference is negligible (960 watts RMS compared to 1000 watts RMS).

Two Sub1s tightly coupled (stacked or side-by-side) should provide up to +6 dB[1] over a single Sub1 (118 + 6 = 124). The Sub 2 is 123 dB SPL. The difference is negligible.


The Sub1 goes down to 40 Hz. The Sub2 goes down to 37 Hz (-3 dB). The difference is due to the larger physical volume of the Sub2 enclosure. Running two Sub1s does not change the frequency response.

RaceTrack Woofer

RaceTrack Woofer
Unique RaceTrack woofers integrated in the Bose Sub1 and Sub2 modular subwoofers deliver powerful bass, have an optimized center of gravity, and save a lot of space. This slim design means you get the full impact of a conventional subwoofer without the cumbersome size, freeing up room in your vehicle and on the stage, and making every carry in between — home to car, vehicle to venue — much easier. [2]

Although the comparisons are approximate and this assumes that other variables like input power are similar:

  • The 7"x13" RaceTrack woofer in the Sub1 is comparable to 12" round driver.
  • The 10"x18" RaceTrack woofer is comparable to a 15" round driver.

Note: Both the Sub1 and L1 Pro8 use a 7"x13" RaceTrack woofer. The L1 Pro8 is rated at 240 watts RMS to the subwoofer. The Sub1 is rated at 480 watts RMS.


Cardioid Mode

Cardioid Mode

Cardioid Subs Explained

A cardioid sub configuration allows for a coverage pattern that is not unlike a cardioid microphone pickup pattern. This coverage pattern allows for most of the sound energy to be focused in front of the sub module stack while drastically reducing the sound energy that is propagated behind the subwoofer stack. This contrasts with a standard subwoofer configuration that will act in an omnidirectional coverage pattern where sound energy propagates equally in all directions for the sub module. The main benefit of the cardioid setup is that the low frequency sound energy from your performance will be focused on the audience and not back onto the stage. This is especially helpful when amplifying large resonant acoustic instruments like drums or an upright bass. This coverage pattern is achieved by changing the direction of the second sub module driver and time aligning it using a small delay to the front facing sub module driver. This will create destructive interference behind the sub stack and results in phase cancellation of the sound energy while creating constructive interference between the modules in front of the sub stack resulting in phase summation and increased sound energy.

To accomplish this, stack two matching sub modules on top of one another as shown here. Make sure that the module facing away from the audience is at the bottom of your stack. This configuration allows for a 10 dB SPL down point located directly behind the subwoofer stack. This configuration is possible with both the Sub1 and Sub2 modules when stacked with an identical module as seen to the left. This can be accomplished without any extra AC power runs thanks to the SubMatch cabling innovation that transmits both power and audio signal to the second subwoofer module.

Cardioid Subs 1.jpg

Connecting and Setting Up

Connecting and setting up To configure cardioid subs, stack two identical modules as seen to the left, connect the top sub module to an L1 Pro32 via a SubMatch cable or an external source and A/C power. Next set the top sub to positive polarity and the bottom sub to cardioid mode by pressing and holding the polarity button until the CARDIOID LED is illuminated.

Make sure that the LEVEL settings are matched across the sub modules as mismatching them will skew the performance of cardioid mode. Once this setup has been completed a 10dB down point will be present directly behind the sub stack. This performance will be extremely beneficial if your performance includes any large resonant instruments such as an upright bass or a drum set.

Cardioid Subs 2.jpg

Note: Bose does not claim Cardioid mode increases the Sound Pressure Level (SPL) in front of the subwoofers. The main benefit is that it reduces the SPL behind the subwoofers.

See the tutorial in the video below starting at 4:05.

Level Control

Sub1 Sub2 Level Control.jpg
Question
Why have a LEVEL control on the Bose Sub1/Sub2? This can also apply to other subwoofers as well.
Answer
Equal-loudness contours from ISO 226:2003 shown with original ISO standard.

At lower volume, the Equal Loudness contour[3] shows that humans don't perceive bass as well as mid-highs. You can compensate for this by turning up the Sub1/Sub2 LEVEL Control.


Other times bass may seem excessive

  • At higher volumes
  • Due to boundary effects (proximity to walls and corners)
  • On a resonant stage

You can compensate for this by turning down the Sub1/Sub2 LEVEL Control.


Recommended Settings
Sub1Sub2 Level Control.jpg
  1. Set the Sub1/Sub2 Level control at 12:00 o'clock[4].
  2. Raise/lower the volume of the L1 Pro32 as required.
  3. Adjust the Sub1/Sub2 Level control to balance bass level with the mid-high level from the L1 Pro 32.



Comments


Sub2 with Sub1

You can use a Sub1 and Sub2 together. The connection will be L1 Pro32 to Sub2 to Sub1

  • Connect the L1 Pro32 to the Sub2 (use the SubMatch cable)
  • On the Sub2 set the Line Out EQ to HPF (High Pass Filter)
  • Connect the Sub2 Line Out to the Sub1 (optional: use a SubMatch cable to the Sub1)
  • Level - set to 12:00 o'clock on both. If adjustments are necessary - keep the Level Control the same on both Subs
  • Polarity: Plus on both

For more information start at 1:23 in the video below.


S1 Pro system with Sub1/Sub2

Preferred Method

Connections with Sub1 or Sub2 and the S1 Pro system

For best results, the signal flow should go from

  1. Sub io panel
    The signal source (e.g., ToneMatch Mixer[5], mixer, DJ console) output to
  2. The Sub1 or Sub2 subwoofer LINE IN 1 ()
  3. The Sub1 or Sub2 subwoofer LINE OUT 1 to
  4. The S1 Pro system with channel volume set to 10 o'clock.
Note these settings on the Sub1 or Sub2
👉 Set LINE IN EQ to L1
👉 Set LINE OUT EQ to S1 (Press and hold LINE OUT EQ button for 4 seconds)

Set up this way,

  1. The Sub1 or Sub2 handles frequencies from 40 Hz (Sub1) 37 Hz (Sub2) to 150 Hz
  2. The S1 Pro system handles frequencies above 150 Hz

The picture shows a stereo setup, but illustrates the principles for mono. The signal flow is from left to right.

S1 Pro with Sub.jpg

S1 Pro with Sub HPF.jpg

Recommended cable

Use an XLR to 1/4 inch (6.35 mm) Tip-Ring-Sleeve cable for best results.

XLRFemale to 14trs.jpg

If you use an XLR to XLR cable, the signal may be too hot for the S1 Pro system.

Alternative Connection

Can I connect the S1 Pro Line Out to the Sub?

The method described above is preferred, but you can use the S1 Pro system as the sound source (e.g., microphone and guitar and backing tracks via Bluetooth) Note the following:

  1. The S1 Pro system will sound the same as without the subwoofer (62 Hz - 17 kHz)
  2. The Sub1 or Sub2 will cover from 40 Hz (Sub1) 37 Hz (Sub2) to 150 Hz
  3. You will be able to push S1 Pro system harder (louder) if you route the signal as described at the top of this article

L1 Compact with Sub1/Sub2

Please see L1 Compact with Sub1 or Sub2

L1 Model II with Sub1/Sub2

If you have a T1 ToneMatch mixer:

  1. DO connect the T1 Main Output (1/4 Tip Ring Sleeve) to Sub1/Sub2 Input 1.
  2. On the Sub1/Sub2 set the LPF setting to L1.
  3. DON'Tconnect Sub1/Sub2 to the L1 Model II Bass Line Out. That output is EQd for the B2 or B1.

If you have a third-party mixer:

  1. Connect a sub or aux line out to Sub1/Sub2 Input 1.
  2. On the Sub1/Sub2 set the LPF setting to L1.
  3. DON'Tconnect Sub1/Sub2 to the L1 Model II Bass Line Out. That output is EQd for the B2 or B1.

Cooling

Question

How are the Sub1/Sub2 cooled?

Answer

Sub1 and Sub2 have extruded aluminum heat sinks mounted to the backside of the I/O panel. This pulls heat out of the electronics and transfers some to the air moving through the acoustic volume of the sub and helps to cool.[6]


Running Multiple Subwoofers

If you are running two or more subwoofers, you want to read these articles:


Comparing L1 Pro Power Stands to Subs

The L1 Pro8 and Sub1 use the 7" x 13" Racetrack transducer. The L1 Pro16 and Sub2 use the 10" x 18" Racetrack transducer. The following is a comparison of the performance of the L1 Pro power stands and the Sub1 and Sub2


L1 Pro8 Power Stand compared to Sub1

Both use the 7" x 13" Racetrack transducer

The L1 Pro8 power stand is 31 pounds. The Sub1 is 35.5.

The L1 Pro8 power stand is slightly smaller than the Sub1.

The L1 Pro8 power stand bass amp is 240 watts RMS. The Sub1 is 480 watts RMS.

The L1 Pro8 is 112 dB SPL continuous. The Sub1 is 118 dB SPL continuous.

The L1 Pro8 goes down to 45 Hz (-3 dB). The Sub1 goes down to 40 Hz (-3 dB).

L1 Pro16 Power Stand compared to Sub2

Both use the 10" x 18" Racetrack transducer

The L1 Pro16 power stand is 41.4 pounds. The Sub2 is 52.

The L1 Pro16 power stand is slightly smaller than the Sub2.

The L1 Pro16 bass amp is 1000 watts RMS. The Sub2 is 1000 watts RMS.

The L1 Pro16 is 118 dB SPL continuous. The Sub2 is 123 dB SPL continuous.

The L1 Pro16 goes down to 42 Hz (-3 dB). The Sub2 goes down to 37 Hz (-3 dB). The difference is due to the larger physical volume of the Sub2 enclosure.

Questions about this article

Questions about this article?