Boost your vehicle’s low‑frequency performance with this matched Alpine & BLAM bass package. The Alpine SWT‑12S4 delivers strong, controlled output from its 12" bass‑reflex tube design, offering efficient airflow and punchy response even on modest power. Its 300W RMS / 1000W peak handling makes it a solid performer for daily driving, providing deep bass without distortion.
Powering the system is the BLAM RA251D Class‑D Monoblock Amplifier, engineered for OEM‑friendly integration and compact installations. Despite its ultra‑small footprint, it delivers clean, stable power with excellent efficiency, perfectly suited to driving the SWT‑12S4 to its full potential. The amp’s design allows discreet mounting behind trim panels, under seats, or in tight boot spaces.
Together, this kit provides a reliable, easy‑to‑install solution for customers wanting a noticeable bass upgrade while keeping space usage and complexity to a minimum.
Key Features
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Alpine SWT‑12S4 12" Bass Reflex Tube (300W RMS / 1000W Peak) — efficient ported design for punchy, dynamic bass
-
BLAM RA251D Class‑D Monoblock (250W RMS) — ultra‑compact, OEM‑compatible amplifier with clean, stable output
-
Matched power pairing for daily‑driver bass performance
-
Space‑saving tube enclosure ideal for small boots and quick installs
-
Perfect for OEM‑plus upgrades, discreet installs, and tight‑budget bass enhancement
UK Deliveries: Free UK mainland delivery applies to orders over £30 (exceptions apply to remote regions and islands, which will see a surcharge at checkout).
Orders Under 2kg: Most in-stock items arrive in 2–3 working days. Items held by suppliers take 4–6 working days. (Note: Saturday is not a working day).
Orders Over 2kg: Dispatched via trusted couriers including AMAZON Shipping, Royal Mail, DPD, and UPS.
Royal Mail Specifics: Royal Mail aims to deliver in 1–3 working days, though this is not guaranteed. If your item has not arrived after 7 days, please contact us. We can only replace missing items after 14 days have passed.
More information (including international delivery on our Delivery Information page.
Boost your vehicle’s low‑frequency performance with this matched Alpine & BLAM bass package. The Alpine SWT‑12S4 delivers strong, controlled output from its 12" bass‑reflex tube design, offering efficient airflow and punchy response even on modest power. Its 300W RMS / 1000W peak handling makes it a solid performer for daily driving, providing deep bass without distortion.
Powering the system is the BLAM RA251D Class‑D Monoblock Amplifier, engineered for OEM‑friendly integration and compact installations. Despite its ultra‑small footprint, it delivers clean, stable power with excellent efficiency, perfectly suited to driving the SWT‑12S4 to its full potential. The amp’s design allows discreet mounting behind trim panels, under seats, or in tight boot spaces.
Together, this kit provides a reliable, easy‑to‑install solution for customers wanting a noticeable bass upgrade while keeping space usage and complexity to a minimum.
Key Features
-
Alpine SWT‑12S4 12" Bass Reflex Tube (300W RMS / 1000W Peak) — efficient ported design for punchy, dynamic bass
-
BLAM RA251D Class‑D Monoblock (250W RMS) — ultra‑compact, OEM‑compatible amplifier with clean, stable output
-
Matched power pairing for daily‑driver bass performance
-
Space‑saving tube enclosure ideal for small boots and quick installs
-
Perfect for OEM‑plus upgrades, discreet installs, and tight‑budget bass enhancement
UK Deliveries: Free UK mainland delivery applies to orders over £30 (exceptions apply to remote regions and islands, which will see a surcharge at checkout).
Orders Under 2kg: Most in-stock items arrive in 2–3 working days. Items held by suppliers take 4–6 working days. (Note: Saturday is not a working day).
Orders Over 2kg: Dispatched via trusted couriers including AMAZON Shipping, Royal Mail, DPD, and UPS.
Royal Mail Specifics: Royal Mail aims to deliver in 1–3 working days, though this is not guaranteed. If your item has not arrived after 7 days, please contact us. We can only replace missing items after 14 days have passed.
More information (including international delivery on our Delivery Information page.
