Component Subwoofer Specs: How to Match Amp, Box, and Depth
A component subwoofer is a raw driver. You supply the box and the amp. Here is how to read the fo...
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Stereo Integrity
Stereo Integrity TM8 | 8 Inch Midbass - Pair
SKU: SI-TM8
$ 499.99
QUICK SPECS
- Type: 8 in midbass, sold as a pair
- Power Handling: 150W RMS, 4 ohm
- Mounting Depth: 58 mm, 183 mm cutout
- Crossover: High-pass above 50 Hz, 24 dB/oct
Stereo Integrity TM8 | 8 Inch Midbass - Pair
Regular price
$ 499.99
Sale price
$ 499.99
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Stereo Integrity
TM8
8 Inch Midbass | Sold as a Pair
Pure Aluminum Cone 50 mm Copper Voice Coil 7.9 mm One-Way Xmax 58 mm Mounting Depth 150W RMS
Big Midbass, Shallow Depth
The TM8 is a completely new, low distortion 8 inch driver that Stereo Integrity designed with Finite Element Analysis in North Carolina. It uses a custom tooled cast aluminum basket with an integrated rain shield and mounts in just 58 mm, so it can bring 8 inch midbass to locations that would not clear a deeper driver.
Its primary role is midbass in a vehicle door, and Stereo Integrity built it to deliver serious output there without giving up mounting depth or budget.
Engineering Highlights
Twin Shorting Rings
A copper pole sleeve and a magnet ID shorting 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 Copper Voice Coil
Solid copper windings on a CZA former drive the pure aluminum cone, and the three work together to move heat away from the coil for better thermal power handling.
Aluminum Cone, Rubber Surround
The pure aluminum cone is shaped for strength to weight and rides on a rubber surround and a Nomex spider for controlled, punchy midbass.
Door Tuned Qts
A door behaves much like an infinite baffle, so Stereo Integrity gave the TM8 a higher than average Qts, in the 0.8 region, for the best balance of extension and output in that space.
Crossover and System Integration
Stereo Integrity recommends a high-pass point above 50 Hz with a slope of 24 dB per octave or steeper. The TM8 covers 27 Hz to 7,000 Hz in a vehicle and extends to 4,500 Hz on axis, and Stereo Integrity recommends a 3,000 Hz crossover point in a 2-way system.
Build a front stage: For a 2-way, pair the TM8 directly with the M28 tweeter. For a 3-way, add the M3 Carbon midrange between them.
Enclosure Options
The TM8 is designed for infinite baffle use in a door, and Stereo Integrity also lists enclosure recommendations: 0.2 cubic feet sealed, up to a maximum of 1.5 cubic feet, or 3.0 cubic feet ported and tuned to 28 Hz with 7 square inches of port area, within a range of 2.5 to 3.5 cubic feet.
Fitment
Outer diameter: 209 mm. Cutout: 183 mm. Mounting depth: 58 mm. Flange thickness: 4.2 mm. Impedance: single 4 ohm. 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 TM8.
| Specifications | ||
|---|---|---|
| Model | TM8 | |
| Size | 8 in midbass, sold as a pair | |
| Impedance | Single 4 ohm | |
| Power Handling (RMS) | 150 W | |
| Sensitivity | 90 dB | |
| Voice Coil | 50 mm (2 in) solid copper on a CZA former | |
| Cone | Pure aluminum | |
| Surround | Rubber | |
| Spider | Nomex | |
| Motor | Ferrite, copper pole sleeve and magnet ID shorting ring | |
| Basket | Custom tooled cast aluminum with integrated rain shield | |
| Terminals | Spring push | |
| Outer Diameter | 209 mm | |
| Cutout | 183 mm | |
| Mounting Depth | 58 mm | |
| Flange Thickness | 4.2 mm | |
| Listed Weight | 4 lb | |
| Thiele-Small Parameters | ||
| Parameter | Klippel Large+Cold | Small Signal |
| DC Resistance (Re) | 4.2 ohm | 3.79 ohm |
| Resonant Frequency (Fs) | 46.0 Hz | 67.4 Hz |
| Electrical Q (Qes) | 0.91 | 1.42 |
| Mechanical Q (Qms) | 3.98 | 4.93 |
| Total Q (Qts) | 0.74 | 1.10 |
| Voice Coil Inductance (Le) | 0.26 mH | 0.26 mH |
| Effective Piston Area (Sd) | 35.16 sq in | 35.16 sq in |
| Equivalent Compliance (Vas) | 24.4 L | 12.57 L |
| Force Factor (Bl) | 6.89 Tm | 6.04 Tm |
| Moving Mass (Mms) | 35.4 g | 32.3 g |
| Suspension Compliance (Cms) | 337 um/N | 172 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 | 89 dB | 89.6 dB |
| Response and Enclosure | ||
| Frequency Response | 25 Hz to 6,000 Hz | |
| In-Vehicle Range | 27 Hz to 7,000 Hz | |
| High-Pass | Above 50 Hz, 24 dB per octave or steeper | |
| 2-Way Crossover Point | 3,000 Hz | |
| Sealed | 0.2 cu ft (up to 1.5 cu ft) | |
| Ported | 3.0 cu ft (2.5 to 3.5 cu ft) tuned to 28 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