P-SB11-ANC Spirit Box - SB11 with Adjustable Noise Control

In this review of the P-SB11-ANC Spirit Box the bottom line is straightforward: this deluxe SB11 is aimed at serious users who want cleaner, more controllable scanning audio for investigative or experimental listening. The reviewer found the standout advantage to be the Adjustable Noise Control, which noticeably reduces scan noise and makes possible phrases easier to separate from static. It keeps the essential dual channel SB11 behavior while adding tactile + and - controls for noise level on each AM and FM channel, so users who value clarity and tweakability will appreciate the update.

Key Features

• ANC Adjustable Noise Control: lets the user reduce unwanted background noise during station sweeps so potential messages are more distinct.
• Dual Channel Sweep: FM and AM channels can be scanned simultaneously so overlapping signals can be compared in real time.
• Adjustable Scanning Speed: each channel has independent sweep speed settings so timing and cadence can be matched to the listener's preference.
• Direction Control per Channel: both FM and AM channels are scannable forward or backward, giving more options when trying to elicit responses.
• ATDD Temperature Alerts: Automatic Temperature Deviation Detection warns of roughly 5F temperature changes that may be relevant during a session.
• Battery Powered: runs from a standard 9V alkaline battery for easy field use without needing mains power.

Who It's For

The P-SB11-ANC is best for experienced users and field investigators who already understand dual channel spirit box operation and want finer control over noise and sweep parameters. The added ANC and separate noise controls for each channel make it a good pick for sessions in noisy environments where separating signals matters.

Less technical users who prefer a plug-and-play, minimal-control device might find the multiple knobs and direction/speed options more complicated than necessary. Those who require rechargeable or mains-powered gear should look elsewhere because this unit is designed around a single 9V alkaline battery power source.

Pros & Cons

Pros

• Adjustable Noise Control dramatically reduces unwanted noise during scans for clearer audio.
• Independent FM and AM sweeping with adjustable speed and direction gives flexible investigative options.
• ATDD temperature deviation alerts add a useful environmental cue during sessions.

Cons

• Runs on a single 9V alkaline battery, so continuous long sessions require spare batteries.

Specifications

Model	P-SB11-ANC Spirit Box
Brand	Spirit Box
Noise Control	Adjustable Noise Control (ANC) with + and - buttons per channel
Channels	Dual Channel Sweep: FM and AM
Scan Controls	Adjustable sweep speed per channel; forward or backward scanning
Environment Alert	ATDD Automatic Temperature Deviation Detection (~5F change)
Power Source	9V Alkaline Battery

Our Verdict

The P-SB11-ANC is a worthwhile upgrade for anyone who used the original SB11 and wants cleaner, more controllable audio during sweeps. With independent noise control, sweep speed and direction for each channel plus temperature alerts, it brings practical improvements without changing the core SB11 workflow, making it good value for focused investigators and hobbyists who need better signal separation.

Frequently Asked Questions

Does the ANC require special setup?
The ANC works out of the box with preset levels, and the user can fine tune noise using the + and - buttons on the back for each channel.

Can FM and AM be scanned at the same time?
Yes, both channels can be scanned simultaneously and each channel's sweep speed and direction are set independently.

What powers the device?
The unit runs from a single 9V alkaline battery for portable use; spare batteries are recommended for extended sessions.