How to Choose the Right Subwoofer Enclosure for Your Car
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Stereo Integrity
Stereo Integrity TM65 mkIV | 6.5 Inch Midbass - Pair
SKU: SI-TM65MKIV
$ 469.99
QUICK SPECS
- Type: 6.5 in midbass, sold as a pair
- Power Handling: 150W RMS, 4 ohm
- Mounting Depth: 58.3 mm, 143 mm cutout
- Recommended Range: 65 Hz to 3,500 Hz, 24 dB/oct high-pass
Stereo Integrity TM65 mkIV | 6.5 Inch Midbass - Pair
Regular price
$ 469.99
Sale price
$ 469.99
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On orders to the lower 48
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Product Details
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Stereo Integrity
TM65 mkIV
6.5 Inch Midbass | Sold as a Pair
Pure Aluminum Cone 50 mm Copper Voice Coil 7.9 mm One-Way Xmax 58.3 mm Mounting Depth 150W RMS
Aggressive Midbass, Smoother Midrange
The TM65 mkIV is a completely new, low distortion 6.5 inch driver that Stereo Integrity designed with Finite Element Analysis in North Carolina. The brief was to keep the aggressive midbass the TM65 line is known for while adding smoother midrange, with on-axis extension out to 5,000 Hz.
It mounts in just 58.3 mm thanks to a custom tooled cast aluminum basket with an integrated rain shield, which makes it a practical upgrade for factory door locations.
Engineering Highlights
Dual Shorting Rings
A copper pole sleeve and a magnet ID ring lower and linearize inductance. Stereo Integrity says the resulting Xmax to Le ratio is usually found only in far more expensive drivers.
50 mm CZA Former Voice Coil
Solid copper windings on a 50 mm CZA former drive the cone. The copper coil, CZA former, and aluminum cone work together to pull heat away from the coil and raise thermal power handling.
Pure Aluminum Cone
The cone body is shaped for the best strength to weight ratio, giving it the stiffness for midbass and deep bass along with proper frequency extension.
Tuned for the Door
A vehicle door is a lossy space that behaves much like an infinite baffle, so Stereo Integrity gave the TM65 mkIV a higher Qts, in the 0.65 region, for the best mix of low frequency extension and output there.
Crossover and System Integration
Stereo Integrity recommends running the TM65 mkIV from 65 Hz to 3,500 Hz with high-pass and low-pass crossovers, using a high-pass slope of 24 dB per octave or steeper. Its anechoic on-axis response runs from 65 Hz to 8,000 Hz, and it stays smooth to 3,500 Hz off-axis.
Build a front stage: Pair the TM65 mkIV with an M22 or M28 tweeter for a 2-way, or add the M3 Carbon midrange, which Stereo Integrity recommends alongside it, for a 3-way.
Enclosure Options
Most TM65 mkIV installs go in the door, but Stereo Integrity also publishes enclosure recommendations: 0.2 cubic feet sealed, with a range of 0.15 to 0.5, or 1.5 cubic feet ported and tuned to 30 Hz with 7 square inches of port area, with a range of 1.2 to 2.0 cubic feet.
Fitment
Outer diameter: 167 mm. Cutout: 143 mm. Mounting depth: 58.3 mm. Mounting holes: 4. Flange thickness: 5 mm. Sold as a pair.
Authorized Stereo Integrity Dealer
Audio Intensity is an authorized Stereo Integrity dealer, and we build enclosures around their drivers.
Call 931-563-5151 and we will help you plan a front stage around the TM65 mkIV.
| Specifications | ||
|---|---|---|
| Model | TM65 mkIV | |
| Size | 6.5 in midbass, sold as a pair | |
| Impedance | 4 ohm | |
| Power Handling (RMS) | 150 W | |
| Sensitivity | 89 dB | |
| Voice Coil | 50 mm solid copper on a CZA former | |
| Cone | Pure aluminum | |
| Surround | Rubber | |
| Motor | Ferrite, copper pole sleeve and magnet ID shorting ring | |
| Basket | Custom tooled cast aluminum with integrated rain shield | |
| Terminals | Spring | |
| Outer Diameter | 167 mm | |
| Cutout | 143 mm | |
| Mounting Depth | 58.3 mm | |
| Mounting Holes | 4 | |
| Flange Thickness | 5 mm | |
| Listed Weight | 4 lb | |
| Thiele-Small Parameters | ||
| Parameter | Klippel Large+Cold | Small Signal |
| DC Resistance (Re) | 3.79 ohm | 3.79 ohm |
| Resonant Frequency (Fs) | 43.3 Hz | 56.7 Hz |
| Electrical Q (Qes) | 0.74 | 0.90 |
| Mechanical Q (Qms) | 3.76 | 3.97 |
| Total Q (Qts) | 0.62 | 0.73 |
| Voice Coil Inductance (Le) | 0.22 mH | 0.24 mH |
| Effective Piston Area (Sd) | 21.0 sq in | 21.09 sq in |
| Equivalent Compliance (Vas) | 12.67 L | 8.10 L |
| Force Factor (Bl) | 6.37 Tm | 6.18 Tm |
| Moving Mass (Mms) | 27.8 g | 25.5 g |
| Suspension Compliance (Cms) | 480 um/N | 309 um/N |
| Linear Excursion (Xmax) | 7.9 mm one-way (70% Bl) | 7.9 mm one-way (70% Bl) |
| Mechanical Excursion (Xmech) | 11 mm one-way | 11 mm one-way |
| SPL | 86.5 dB | 87.43 dB |
| Response and Enclosure | ||
| Frequency Response | 30 Hz to 6,000 Hz | |
| Recommended Use | 65 Hz to 3,500 Hz with high-pass and low-pass crossovers | |
| High-Pass Slope | 24 dB per octave or steeper | |
| Sealed | 0.2 cu ft (0.15 to 0.5 cu ft) | |
| Ported | 1.5 cu ft (1.2 to 2.0 cu ft) tuned to 30 Hz | |
| Port Area | 7 sq in | |
| Figures as published by Stereo Integrity. Large+Cold values are Klippel large-signal measurements; small signal values are the conventional set most modeling tools report. | ||
See every Stereo Integrity subwoofer box and enclosure, each cut for a specific Stereo Integrity driver.
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Check back soon, or reach out and we'll walk you through it: 931-563-5151
