Experience Nobility

POSITIV-I Photo

As a connoisseur of good music, you demand the nobility of full-bandwidth sound and superb stereo imaging. We provide it. The POSITIV-I satellite speakers are the perfect companion to T-TECH's Prestant-I subwoofers.

Each satellite unit features an 8 inch mid-bass driver having a Kevlar* composite cone and back-vented pole piece, a 5 inch poly midrange with large excursion capability and forward-vented voice coil for extremely low distortion, and a tweeter featuring a ferrofluid cooled voice coil and titanium* composite dome for excellent transient and off-axis response. The POSITIV-I satellites also feature time-aligned drivers (see photo of unit without front grill cloth cover). Time-alignment of drivers is obtained by a "terraced" driver mounting panel, but a flat front grill permits a classic cabinetry appearance that avoids the "tech" look of other time-aligned systems.

A special crossover network reduces the error at the crossover points in both amplitude and phase. Crossover points are 1 KHz and 5 KHz in the POSITIV-I and 125 Hz for the PRESTANT-1. The crossover components are physically distributed between subwoofers and satellites, so that the system wiring can be branched from the amplifier or from either subwoofer or satellite, making installation effortless and without clutter.

The system crossover is totally passive, but bi-amping is also possible via multiple binding posts on the rear panel of the satellite units. The satellite units can be operated without their built-in high-pass filters, permitting staged up-grade to complete the system by adding subwoofers at a later time.

THE "PDS" DESIGN APPROACH

All cabinetry features walnut veneered l-inch thick walls. Construction follows the PDS ("plenty darn stout") philosophy. Instead of the usual 1/16 inch printed circuit board thickness, the crossover network uses 1/8 inch thickness. This greatly stiffens the fiberglass printed circuit board, which is then mounted to the interior of the cabinet using a compressive sound absorbing gasket sheet to prevent rattles and buzzes. Inductors, circuit breakers, resistors, and capacitors also follow the "PDS" philosophy. Special high-temperature "SONEX" sound absorbing material is employed in the interior of the cabinet for back-wave damping.

A mid-bass 8 inch driver is employed in order to reduce cone excursion to insignificance, thus practically eliminating distortion between 125 and 900 Hz (a difference you can hear on choral and operatic crescendos or kettle-drums). The midrange driver has an extended pole piece and rubber surround, and its excursion in actual operation is small compared to its capability. This over-design makes possible the ability to handle large musical transients and crescendos effortlessly. The titanium-composite dome tweeter high frequency response rolls off only slightly off-axis compared to on-axis. This spreads the stereo image and reduces the "critical listening position" problem. A midrange "phasing plug" also provides wide bandwidth on and off-axis.

The result of "PDS" over-design can be appreciated in laboratory measurements, but becomes even more evident to the ear. Our competitors' smaller speakers sound disappointing on musical crescendos. Compared to the POSITIV-I speakers, they provide sound that resembles a pocket "transistor radio".

SMALL-SIGNAL VERSUS LARGE-SIGNAL RESPONSE

Small speakers can be made to have flat frequency response at low loudness. An extreme example of this is a pair of headphones. At low loudness, headphones can exhibit flat response, but if asked to fill the whole room with sound, they deliver severe frequency response limitations and distortion. Flat frequency response at high volume (loudness) is difficult to achieve, and conflicts with the desire for miniaturization. Cabinet weight is also important. A competitor's "foot-stool"-sized subwoofer is so lightweight that at Iow-frequencies and high volume it nearly becomes a "hover craft"! (Its downward firing woofer cone produces enough air pressure to visibly move the cabinet vertically)

A "trade-off", or compromise, is invoked by most manufacturers between small size and high performance, but T-TECH has vowed to make compromise a word foreign to our vocabulary.

Although our approach to the design has been "no holds barred". we know of no other way to bring you the nobility of sound you demand as a true connoisseur. Audition the full POSITIV-I and PRESTANT-I full-bandwidth (16 Hz to 21 KHz) system and "EXPERIENCE NOBILITY".

* Kevlar is a material used in bullet-proof vests. It is extremely light weight, yet incredibly strong. Titanium is one of the strongest light-weight metals known, and because of this it is excellent for tweeter domes, when suitably damped to avoid ultra- sonic ringing.

SPECIFICATIONS:

Bandwidth: (A) With built-in highpass filter (activated via jumpers on rear panel):
               
               125 Hz to 21 KHz (low end ext'd to 16 Hz with PRESTANT-1 subwoofers)

           (B) Without built-in highpass filter (jumpers on rear disconnected):
               
               60 Hz to 21 KHz (usable to 40 Hz with a suitable graphic equalizer)
                  
                  
Impedance:  8 ohms nominal, increasing below 125 Hz highpass corner frequency
  
Size:       24" high x 14.25" wide x 11.25" deep

Weight:     50 pounds each

    
Maximum power for minimal distortion:    200 watts at 150-500 Hz
                                         55 watts at 2 KHz
                                         25 watts at 10 KHz

Sensitivity: 91 dB SPL for 2.83 volts RMS at 1 meter

DISCLAIMER: Specifications subject to change or improvement without obligation to incorporate those improvements in previously sold units. T-TECH is a trademark. This page is copyright-protected.


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