Stereo Integrity TM65 MKIV 6.5" Midbass Speaker (Pair) | 150W RMS

Stereo Integrity TM65 MKIV 6.5" Midbass Speaker (Pair) | 150W RMS | 4 Ohm

The Stereo Integrity TM65 MKIV is a powerhouse 6.5" midbass driver, engineered with precision and purpose to deliver rich, detailed low-end and clean midrange—making it one of the most versatile and high-performing speakers in its class. Designed in North Carolina using Finite Element Analysis (FEA), this latest version of the legendary TM65 balances aggressive punch with musical smoothness.

With a 150W RMS rating, 7mm of one-way linear Xmax, and a custom 50mm copper voice coil, the TM65 MKIV produces tight, accurate midbass that hits hard and stays clean. Its pure aluminum cone offers the ideal strength-to-weight ratio for detailed midrange extension and fast transients.

A custom-tooled cast aluminum basket with integrated rain shield keeps the mounting profile ultra-slim at only 2.3" deep, while dual shorting rings lower and linearize inductance, ensuring distortion-free output across a wide bandwidth.

Key Features:

• 150W RMS Power Handling

• 4 Ohm Nominal Impedance

• 50mm Copper Voice Coil on CZA Former

• Pure Aluminum Cone with Rubber Surround

• Cast Aluminum Basket with Integrated Rain Shield

• 7mm Xmax (One-Way, 70% BL), 11mm Xmech

• High BL-to-Le Ratio for Superior Motor Control

• Custom Designed for Infinite Baffle (Car Doors)

• Smooth Midrange Response to 3,500 Hz Off-Axis

• Outperforms Drivers Costing 3–6x More

Performance & Crossover Use:

• Frequency Response (Recommended): 65 Hz – 3,500 Hz

• Frequency Response (Anechoic On-Axis): 65 Hz – 8,000 Hz

• High-Pass Crossover: ≥ 65 Hz @ 24 dB/octave

• Low-Pass Crossover: ≤ 3,500 Hz

Pair with the Stereo Integrity M25 MKII Tweeters or M3 Carbon Loudspeakers for a high-end front-stage setup that rivals components costing significantly more.

Component Speaker Specifications

Quick Info:

• Power Handling (RMS): 150 Watts

• Nominal Impedance: 4 Ohms

• Weight (Each): 4 lbs

• Mounting Depth: 58.3 mm (2.3")

• Outside Diameter (OD): 167 mm

• Cutout Diameter: 143 mm

• Voice Coil Diameter: 50 mm

• Terminal Type: Spring-Loaded

• Number of Mounting Holes: 4

• Basket Flange Thickness: 5 mm

Thiele-Small Parameters:

• Re: 3.2 Ohms

• Fs: 61 Hz

• Qes: 0.82

• Qms: 3.76

• Qts: 0.67

• Le: 0.16 mH

• Sd: 21.1 in²

• Vas: 7.03 Liters

• BL: 6.23 Tm

• Mms: 25.5 g

• Cms: 267 µM/N

• Sensitivity: 88.8 dB

• Xmax: 7 mm (One-Way, 70% BL)

• Xmech: 11 mm (One-Way)

Materials:

• Surround Material: Rubber

• Cone Material: Aluminum

• Voice Coil Material: Copper

• Magnet Material: Ferrite

Enclosure Recommendations:

Sealed:

• Optimal Volume: 0.2 ft³

• Minimum Volume: 0.15 ft³

• Maximum Volume: 0.5 ft³

Ported:

• Optimal Volume: 1.5 ft³

• Minimum Volume: 1.2 ft³

• Maximum Volume: 2.0 ft³

• Tuning Frequency: 30 Hz

• Port Surface Area: 7 in²