T-1 Mk. IV Ribbon Tweeter

Designed by Dick Sequerra

Dick Sequerra has been in the forefront of producing loudspeakers ever since the introduction, in 1976, of the first T-1 ribbon speaker. The T-1 has become the reference standard for ribbon speakers. MIT, Bell Labs, Bruel & Kjoer are among the prestigious institutions now using the T-1.

For 1998 we proudly present the T-1 Mk. IV.

T-1 MKIV RIBBON TWEETER TECHNICAL SPECIFICATIONS

• Sensitivity: 1w /1 meter 10kHz 96dB SPL.
• Polar Response: 10kHz Vertical 90 - Horizontal 170.
• Frequency Response on Axis: 2dB 1.6kHz to 60kHz.
• Level Attenuator: "T" Pad 2dB steps for a 10dB total.
• Impulse Response: 10% - 90% Less than 3 microseconds.
• Impedance: 8 ohms.
• Maximum peak pink noise power: 250 watts.
• Maximum average power: 1.6kHz to 60kHz - 40 watts RMS.
• Harmonic distortion: @115 dB - less than .15%.
• CCIE Intermodulation distortion: @115dB - less than .1%.
• Flux density in air gap: 3300 Gauss.
• Crossover frequency: 1.8 kHz.
• Crossover Slope: 1st Order Electrical, 2nd Order Acoustical.

T-1 MKIV RIBBON TWEETER MECHANICAL SPECIFICATIONS

• Ribbon Size: 1" Wide x 7 1/2" Long.
• Ribbon Mass: Less than 7 milligrams.
• Magnet assembly weight: 24 Lbs.
• Net weight each: 31 Lbs.
• Height: 9.25".
• Width: 6.25".
• Depth: 13 1/8".

LIMITED WARRANTY AND MANUFACTURING INFORMATION

• T-1 Mk. IV Ribbon Tweeter Warranty: Unconditionally to the original owner for a period of (5) years against any manufacturing error or defect.
• Sequerra Associates, Ltd. Reserves the right to change and/or modify the T-1 Mk. IV Ribbon Tweeter at anytime without notice.

WHITE PAPER ON RIBBON LOUDSPEAKER TECHNOLOGY

• We present a White Paper on ribbon loudspeaker technology.
• Also available for download (shift-click) in Word or Rich Text Format

T-1 MKIV RIBBON TWEETER PRICE AND PURCHASE INFORMATION

• Price: US$ 4,000.00 (per pair).
• Please contact Sequerra Associates to audition and purchase the T-1 Mk. IV Ribbon Tweeter.