How to run in your REL Reference Series subwoofer for long-term performance
A question that comes up regularly among serious audio enthusiasts is, “Does my new subwoofer need a break-in period, and how should I approach it?”
With the Reference No.36 and No.35, the answer is yes. Both the electronics and the drive unit benefit from an initial period of carefully controlled use. These are sophisticated sub-bass systems, engineered to work as an integrated whole, and giving them time to run in is an important first step toward years of exceptional performance.
The temptation with a new Reference subwoofer is understandable. You have invested in a remarkable piece of audio engineering, connected it to your system, and want to experience everything it can do. But before reaching for the volume control, it is worth taking a more measured approach.
The goal is not to push your new REL to its limits. It is to give the electronics and drive unit time to settle into regular operation, without placing unnecessary stress on the system.
Contents:
- Why Break-In Matters
- The Right Approach to Break In Reference
- What Not To Do During Break-In
- Final Result
Why Break-In Matters
A subwoofer is much more than a driver in a cabinet. It is a complete audio system in its own right, combining an input filter circuit, a powerful amplifier and power supply, a dedicated drive unit, and a carefully engineered enclosure.
The No.35 and No.36 are designed around the principle that these elements must work in harmony to deliver the fidelity, control and integration expected of a REL Reference subwoofer.
During the initial running-in period, both the electronics and the drive unit benefit from carefully controlled use. REL's operating instructions also note that the substantial power supplies in these models may take several days to fully charge and form their capacitors.
This is why patience matters. Rather than immediately demanding maximum output, allow your new Reference subwoofer to become accustomed to operation gradually.
Breaking In Your No.35 or No.36: The Right Approach
REL's guidance is straightforward: take care during the initial period of use and resist the temptation to run the subwoofer at excessive volume.
1. Begin with a Properly Connected System
Before playing music, confirm that your Reference subwoofer is connected correctly and that your system is ready for use.
For conventional stereo systems, REL recommends the High Level connection using the supplied cable and Neutrik® SpeakOn® connector as the first choice, where compatible. Low Level RCA or XLR connections are available when High Level is not an option. For home theater, the dedicated .1/LFE input accommodates the signal from your surround-sound processor.
Always switch off your system before disconnecting any wires, and follow the connection instructions in your No.35/No.36 operating manual.
Once everything is connected, begin with a sensible listening level. Your first objective is to confirm normal operation, not to test the limits of your new subwoofer.
2. Start at a Moderate Volume
When a new Reference subwoofer first begins producing sound, give it time to operate at a comfortable, moderate listening level.
Avoid the urge to turn the system up aggressively simply because the subwoofer is capable of substantial output. REL specifically cautions that running a unit at too high an initial volume can cause damage.
The No.35 and No.36 are engineered to deliver extraordinary bass performance, but that does not mean maximum output is the appropriate starting point. A controlled beginning is the better approach.
3. Let the Subwoofer Run In Through Normal Listening
There is no need to turn the break-in process into a complicated ritual. Play music with meaningful bass content and allow the subwoofer to operate as part of your system at sensible levels.
Music with a repetitive, low-frequency percussion line is particularly useful when listening critically and preparing to position or tune your REL. One track recommended in the Reference operating instructions is “Cosmo…Old Friend,” track four from the Sneakers soundtrack.
Its recurring bass drum provides a consistent reference when assessing placement and, later, phase and crossover settings.
During the initial running-in period, however, the priority is controlled use rather than aggressive output. Allow the system to operate without repeatedly pushing the volume higher.
4. Give It Time: Approximately 24 Hours of Actual Use
REL's operating instructions recommend approximately 24 hours of actual use for the initial running-in period.
This is a guide to operating time, not a requirement to play the subwoofer continuously at high volume or to complete the process in a single session. The manual also notes that the power supplies may take several days to fully charge and form their capacitors.
Allow the system to accumulate operating time through sensible listening sessions. Do not rush the process, and do not assume that a short demonstration immediately after installation represents the subwoofer's final performance.
Care during this initial period is intended to support long-term reliability and the subwoofer's eventual performance potential.
5. Fine-Tune Your System as You Become Familiar with It
Break-in and system setup are related, but they are not the same task.
Your room, loudspeakers and listening position all influence how bass is perceived. Once your subwoofer is connected and operating normally, careful positioning and tuning will help it integrate with the rest of your system.
For the No.35 and No.36, REL recommends beginning with a position in a front corner behind the main speakers, then making small placement adjustments while listening to a suitable bass-rich track. A stereo pair may benefit from placement in the front corners or slightly behind and outside the main speakers, depending on the room.
The Reference remote allows you to adjust the High/Low Level, crossover frequency and phase. Make adjustments methodically, listening for bass that is deep, articulate and properly integrated with the main speakers rather than simply seeking the greatest output.
As you gain experience with the system, you can make subtle refinements to achieve the balance that works best in your room.
What Not to Do During Break-In
Knowing what to avoid is just as important as knowing what to do.
Don't turn the volume to maximum straight away. REL specifically warns against running a new No.35 or No.36 at excessive initial volume. Start conservatively and increase the demands on the system sensibly.
Don't confuse break-in with setup. A louder setting does not automatically produce better integration. Placement, phase, crossover and level all contribute to the final result.
Don't deliberately drive the subwoofer into overload. The Reference models incorporate thermal overload protection. If the protection activates and output is interrupted, treat this as a warning that the unit is being overdriven and reduce the level to a safe setting.
Don't rush the process. The initial running-in period is an opportunity to let the electronics and drive unit settle into use. Give the system time rather than trying to force an immediate result.
The Reward: A Reference System Ready for the Long Term
The No.36 and No.35 represent the Reference approach to bass reproduction: exceptional output paired with control, precision and integration. Getting the best from them begins before the final crossover adjustment or the first full-volume listening session.
By ensuring the system is correctly connected, beginning at moderate volume, allowing approximately 24 hours of actual use for the initial running-in period, and avoiding excessive output, you are following REL's recommended approach to preparing your subwoofer for long-term use.
After that, take your time with placement and setup. Listen carefully. Make small adjustments. Allow the subwoofer to complement your main loudspeakers rather than overwhelm them.
The result is a more considered approach to experiencing what the Reference Series was designed to deliver: bass that is powerful when the music demands it, articulate when the performance calls for delicacy, and seamlessly connected to the entire listening experience.
A Reference subwoofer deserves a Reference approach. Give your No.35 or No.36 the time it needs, and enjoy the journey toward exceptional bass performance.
For complete instructions on connection, positioning, tuning and safe operation, consult the operating manual supplied with your REL Reference No.35 or No.36.
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