Stereo Integrity TM65 mkIV 6.5″ Midbass Speaker (Pair)

Stereo Integrity TM65 mkIV Midbass Speaker (Pair)

Welcome to the TM65 mkIV loudspeaker. A completely new low distortion driver designed in Finite Element Analysis here in comfy North Carolina. Dedicated to keeping the legendary TM65 aggressive midbass performance while also providing smooth midrange with on-axis extension out to 5,000 Hz.

Our TM65 mkIV uses our custom tooled cast aluminum basket with an integrated rain shield and a very shallow mounting depth of only 2.28″.

Twin shorting rings (one copper pole sleeve and one magnet ID ring) lowers and linearizes inductance for an Xmax:Le ratio only found in significantly higher priced loudspeakers. And with 7 mm of Xmax via 70% BL one-way the TM65 mkIV keeps the pant-leg-slapping midbass that you are used to with the previous versions but with smoother sound reproduction largely due to its 50 mm diameter CZA former voice coil with solid copper windings mated to the pure aluminum cone body.

The pure aluminum cone body was carefully designed with the best strength-to-weight ratio to allow for proper frequency extension and strength for midbass / deep bass extension. Perhaps most importantly is the pure copper voice coil, CZA former, and aluminum cone also offer tremendous thermal advantages as they all work in tandem to extract and disperse heat from the voice coil which increases thermal power handling.

We designed our TM65 mkIV with a higher-than-average Qts. The main install location for our TM65 mkIV’s is in a vehicle door. A vehicle door is a very lossy enclosure that closely mimics an Infinite Baffle alignment.

To achieve the most performance from an Infinite Baffle alignment you want your Qts to be as close to the ideal 0.707 Qtc alignment of a sealed enclosure, which is why our TM65 mkIV’s Qts is in the 0.65 region. With our Qts close to a 0.7 it yields the best combination of low-frequency extension and natural output capability. Our TM65 mkIV is for those of you who want a plethora of midbass capability without sacrificing mounting depth and/or price.

Midrange fluidity is presented with the TM65 mkIV’s smooth frequency response up to 3,500 Hz off-axis. Couple the TM65 mkIV to our M3 Carbon loudspeaker or our M25 mkII tweeter and you have a world-class front stage.

Anechoic frequency response is 65 Hz to 8,000 Hz on-axis. Recommended frequency response is 65 Hz to 3,500 Hz with the use of high-pass and low-pass crossovers. Recommended high-pass crossover slope is equal to, or greater than, 24 dB/octave.

Specifications:

Quick Info

• Weight 4 lbs
• Dimensions (OD) 167 mm
• Dimensions (Cutout) 143 mm
• Mounting Depth 58.3 mm
• RMS 150 watts
• Impedance 4 Ohms

Materials

• Surround Material Rubber –
• Cone Material Aluminium –
• Voice Coil Material Copper –
• Magnet Material Ferrite

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 square inches
• Vas 7.03 Liters
• BL 6.23 Tesla Meters
• Mms 25.5 grams
• Cms 267 µM/N
• Xmax 7 mm one-way 70% BL
• Xmech 11 mm one-way
• SPL 88.8 dB

Enclosure Recommendations

• Sealed Enclosure Volume 0.2 cubic feet
• Minimum Sealed Enclosure Volume 0.15 cubic feet
• Maximum Sealed Enclosure Volume 0.5 cubic feet
• Ported Enclosure Volume 1.5 cubic feet
• Minimum Ported Enclosure Volume 1.2 cubic feet
• Maximum Ported Enclosure Volume 2.0 cubic feet
• Ported Enclosure Tuning 30 Hz
• Port Surface Area 7 square inches

Performance & Compliance

• Frequency Response Minimum 30 Hz
• Frequency Response Maximum 6000 Hz
• Sensitivity 89 dB

Additional Specifications

• Voice Coil Diameter 50 mm
• Terminal Type Spring –
• Basket OD Flange Thickness 5 mm
• # of Mounting Holes 4 –

Sold As Pair