Big Sound, Compact Control: Inside the SPL BiG [STUDIO] Stereo Image Enhancer

If you're looking to add depth, clarity, and size to your mixes without overcomplicating your workflow, SPL's BiG [STUDIO] may be the tool your studio needs. Housed in a sleek 19" rack format, this analog stereo image enhancer does just what its name implies, makes your mixes sound bigger, more vivid, and harmonically rich.

Precision Stereo Imaging with Simple Controls

At the heart of BiG [STUDIO] is its intuitive three-knob interface:

• Range lets you select which part of the frequency spectrum gets processed.
• Stage allows you to shift that frequency band forward or backward in the stereo field.
• Bigness adjusts the overall intensity of the stereo widening effect.

Together, these controls offer powerful stereo manipulation without a steep learning curve.

Unique Analog Signal Path – Not Just M/S

Unlike typical mid-side processors, BiG [STUDIO] uses a completely new analog approach. It works by isolating a difference signal from the input, processing it through a filter network, and blending it back in using a custom mixing stage. The result? A dramatic stereo effect that stays phase-accurate even when collapsed to mono.

Tube Harmonics and Bass Boost

Want to add warmth and presence? Engage the Tube Harmonics section. With a dedicated control and a switch to activate the tube circuit, this feature generates harmonics that enrich your signal without harshness. You’ll know the tube is warming up when the indicator blinks. Need more bottom end? A Bass switch at the end of the chain adds a subtle low-end lift, modeled after SPL’s IRON Mastering Compressor’s AirBass filter.

Build Quality That Lasts

With a 4mm anodized aluminum front panel, solid aluminum knobs, and a powder-coated steel housing, BiG [STUDIO] is designed to endure years of use in professional environments. It’s built in Germany using high-quality through-hole components that are selected by ear for their sonic character.

Flexible I/O and Ground Lift

All connections are Neutrik XLR and TRS, electronically balanced at a nominal +6 dB. Inputs and outputs are paralleled, and a Ground Lift switch on the back helps eliminate hum-causing ground loops.

Technical Highlights

• Frequency range: 10 Hz – 200 kHz
• Max gain: +22.5 dBu
• THD + N: 0.0035%
• Dynamic range: 120 dB
• Harmonics boost: up to 9 dB at 6 kHz
• Bass boost: +2 dB at 42 Hz
• Dimensions: 19" rack mount, 1U height
• Power: Internal linear PSU with toroidal transformer

If you're after analog warmth, modern stereo expansion, and intuitive control in a premium build, SPL’s BiG [STUDIO] is ready to be your next rack favourite.