Bass Reflex Tuning Port Tube Vent BR-100HP

Monacor Bass Reflex Tube BR-100HP - Art. No. 0128600

Description
The Monacor BR-100HP is a high-performance bass reflex port tube engineered for high-output loudspeaker enclosures and subwoofer builds. Moulded from durable black plastic, it features a flared outer outlet with a soft, rounded edge designed to streamline high-velocity airflow and drastically reduce port turbulence and "chuffing" noise. Featuring an internal diameter of 93 mm and an overall length of 140 mm, this port tube provides a generous cross-sectional area to prevent port compression in high-power applications. The tube can also be cut shorter to precisely adjust the resonant tuning frequency of your cabinet.

Key Features:

• Flared Outlet Design: Soft, rounded flare at the port exit minimises air turbulence and chuffing noise at high volume and high driver excursion.
• High Airflow Capacity: Generous 93 mm internal diameter provides an effective opening area of approx. 69.4 cm² for unrestricted low-frequency output.
• Customisable Tuning Length: Straight section of the tube can be easily cut down to shorter lengths to fine-tune the enclosure resonant frequency.
• Rigid Plastic Construction: Moulded from high-grade black plastic for rigid, resonance-free performance inside the enclosure.
• Flush Flange Edge: 143 mm outer flange provides a clean, professional finish across the speaker baffle or rear panel.

Technical Specifications:

• Model / Order Code: Monacor BR-100HP / 0128600
• Material: Black plastic
• Inside Diameter (ID): 93 mm
• Outside Tube Diameter (OD): 138 mm
• Flange Outer Diameter: 143 mm
• Overall Length: 140 mm
• Opening Surface Area (SV): Approx. 69.4 cm²
• Mounting Method: Glued into cabinet panel cutout

Why Use a Flared Bass Reflex Port?

• Extended Bass Response: Allows a vented enclosure to reproduce significantly deeper, punchier low-end frequencies than a sealed box of similar size.
• Eliminates Port Chuffing: Standard straight-cut pipes create harsh air whistling and distortion when air moves rapidly. The flared outlet smooths air exit and entry for clean, natural bass.
• Higher System Efficiency: Harnesses the rear energy of the woofer cone to boost total bass output without requiring extra amplifier power.

Suggested Uses & Applications:

• High-output Hi-Fi floorstanding speakers, studio monitors, and custom PA loudspeaker cabinets.
• Home theatre subwoofers and automotive vented bass enclosures requiring high acoustic output.
• Upgrading or replacing un-flared, small-diameter ports to eliminate chuffing distortion in existing speaker boxes.

Installation & Mounting Tips:

• Precise Hole Cutout: Requires an accurate circular cutout (approx. 138 mm) in the speaker baffle or cabinet wall to ensure a snug fit for the main tube body.
• Airtight Adhesive Seal: Apply a suitable plastic-to-wood adhesive or construction sealant around the outer body when mounting to guarantee an airtight, vibration-free join.
• Length Adjustment: If your enclosure calculations call for a shorter port length to raise the tuning frequency, carefully shorten the straight end of the tube using a fine-tooth saw.
• Internal Air Clearance: Ensure the inner open end of the tube has at least 90 - 100 mm of clear space from internal cabinet walls or dampening materials to allow unobstructed airflow.