Stereo Passive Equalizer


The Bettermaker® Stereo Passive Equalizer (SPE) is for those who seek outstanding EQ quality with the convenience of fast and precise recall and automation. The SPE offers a 100% analog signal path of legendary passive filters. All this with mastering grade sound and patented recall with the speed of a native plugin.

– 100% analog audio signal path

– USB connectivity with MAC/PC

– all parameters are digitally controlled by DAW (with dedicated plugin)

– stereo passive equalizer with extended hi-boost section (air bands: 20 and 28 kHz)

– adjustable output level (+/- 8dB)


Digital Section

The sound of the Stereo Passive Equalizer is based on its high-quality analog filters, precisely matched capacitors and inductors. But all the control and user interactions can be performed in the digital domain. This allows for options and possibilities not found in any standard analog equalizers:

– Instant reset of all parameters

– Rapid, precise and repeatable adjustments

– Precisely linked stereo operation with the ease of a single control

– DAW automation and recall of all available parameters

The digital section of the Stereo passive Equalizer is based around a high speed, 32-bit micro-controller, with dedicated firmware programmed into its memory (with the possibility of updating the firmware via USB connection). It controls the parameters of analog filters, watches over the user interface, USB connectivity and other SPE functions.



DAW Integration

The Bettermaker Stereo Passive Equalizer can communicate with your DAW via USB connection.

The unit appears as a HID device and can be managed via the Bettermaker Stereo Passive Equalizer Plugin.


click here for product manual PDF


bettermaker downloads link


REVIEW by Recording Magazine PDF


Maximum input level: +24 dBu (balanced with 48kΩ input impedance)
Maximum output level: +27 dBu (balanced with 50Ω + 50Ω output impedance)
Nominal audio level: +4 dBu
Frequency response: 7Hz – 30kHz (-0.5 dB, ISO-R40 sweep)
Frequency flatness: +/- 0.2 dB (20Hz – 20kHz, ISO-R40 sweep)
Dynamic range: 101 dB (20kHz bandwidth, +24dBu)
THD+N ratio: 0.009 % (20kHz bandwidth, +4dBu, 1kHz)
THD ratio: 0.0025 % (+4dBu, 1kHz)
CMRR: > 70dB (20Hz – 20kHz, IEC 60268-3)
Crosstalk: > 88dB (20Hz – 20kHz, +18dBu, channel to channel)
Max LF boost: 15 dB (set to 100 Hz)
Max LF cut: 16 dB (set to 100 Hz)
Max HF boost: 18 dB (all frequencies)
Low boost/cut frequencies: 20, 30, 60, 100 Hz
High boost frequencies: 3, 4, 5, 6, 8, 10, 12, 16, 20, 28 kHz
High cut frequencies: 5, 10, 20 kHz
Control Resolution: 101 steps (Lo Boost, Lo Cut, Hi Boost, Bandwidth) & 34 steps (Hi Cut)
Output gain: +/- 8 dB (0.1 dB resolution)
Unit height: 2U
Depth: 140 mm
AC power consumption: 15W (2W in standby, with included 100-240VAC power adapter)