Hi-Vi  Trinity 6



When I bought these in 2011, I had a notion to buy 4 but being a point source driver, a pair in each channel would have defeated that.  White it's considered a full range tri-axial, it's very weak in the lower end which was expected due to the small effective radiating area of the woofer, 14 in^2, 7% larger than that of a 5 inch unit.

Mixed reviews, few that I found, commented not only on the weak bass but also the tweeter.  Their hearing, most likely better than mine which falls fast after about 12 khz, may be more sensitive to the 3 dB peak between 7 khz and 9.6 khz. (see fig. 2  blue trace)

The mid-range seemed flawless (fig. 2  red trace).  The crossover used was passive, second order and the filters were designed for 700 hz and 10 khz, thus attenuating the aforementioned tweeter peak by the action of the tweeter high pass filter.

The woofer section was limited to about 200 hz with a second order high pass filter section.  A pair of 10 inch woofers in 3 ft^3 of reflex loading provided the band below 200 hz.  Given the efficiency of the Trinity, the bass had to be slightly boosted to keep up with the Trinity.  Later, an electronic crossover made it easy to tone down the 200 hz and above passband.  I don't particularly care for the use of fixed resistor L or T pad attenuators and much less the variable L-pad.  The latter tend to get flaky at the of rotation.

Overall, even with the dead tweeter, these little guys are incredible even at SPLs approaching 100 dB on transients, as long as the bottom end is filtered at about 200 hz. especially reproducing drums, like Gene Krupa,  Buddy Rich, Mick Fleetwood and Dave Brubeck's drummer, Joe Morello especially in 'Take Five".






The dent in the tweeter was caused by a hex key which slipped from my fingers while tightening a screw. The strong magnet grabbed it.  End of tweeter.








The impedance curves for all three sections of two units.  The woofer curves were stopped at 100 hs due to the fact that the woofer would be filtered at 200 hz.  Note the woofer's nominal impedance of about 3.7 ohms around 300 hz.








The response curves, gated, showing the tweeter's linearity to 20 khz. (blue)







A gated frequency response above 400 hz.  The similarity between the two speakers is quite remarkable.  The 400 hz limit is due to the proximity of the speaker and microphone from reflecting surfaces in a room.  This room measures 20' x 17'. Measured at 1/4w 1/2 meter which is sonically equivalent to 1w 1m.

These response curves were run WITHOUT the tweeter.  With an upper crossover frequency around 5 khz, the dip at 7 khz is not there nor is the peak between 12 khz and 17 khz. (See fig. 2)

This high frequency peak, though, is probably advantageous to those over 45 as high frequency sensitivity decreases with age.  I knew a fella in the 70's who couldn't hear anything above about 13 khz.  the4 reason he gave me was "too many rock concerts".

Hearing damage is not reverseable.


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