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Monacor DT-99 Tweeter

25mm Pure Silk Dome Tweeter with 100mm Faceplate.

A good value replacement for old 100mm tweeters such as the Audax HD100 series, Peerless DT-100 and LR-10-DT, as found in many 1970s/80s designs.

The DT 99 has an excellent radiation pattern with a smooth rising response curve and offers a level of performance that is is unparalleled at this price point.

Key Features:

  • Smooth frequency response
  • 25mm Pure Silk Dome
  • Wide Dispersion
  • Good efficiency
  • Great value for money
  • Ferrofluid cooled

Basic parameters:

Resonant frequency (fs) 1500 Hz Nominal impedance (Zn) 8 Ω
Effective diaphragm diameter 25mm DC resistance (Re) 5.7 Ω
Ferrofluid ? Y/N Yes
Max power handling 80 W
Recommended crossover 2.5kHz/12dB Faceplate diameter 100 mm
Sensitivity (2.83V/1m) 93 dB Cutout hole diameter 70 mm

Here's the full datasheet:

.pdf link

Customer Reviews

Based on 1 review
Great choice for low cost replacement ( but beware )

Be aware this may physically replace the DH100T ( 811815) and many other 100mm face plate tweeters but there the similarities stop. Electrically and acoustically they are worlds apart from the early Peerless offerings . The DT99 has a rising frequency from 3K up to 20K to a mind boggling 96 db . It is a 92db driver but at 3k so be warned if a direct swop for a DH100 is envisaged . A few tweaks to the cross over, mine at 3500hz ( at 12db/ octave ) , plus a gargantuan lpad of 5/ 10 ohm and measurement wise it all fell into place . Measurement wise its not too bad . Listening wise ,no smearing and captures trailing cymbols / highs nicely . The manufacturers FR is a bit choppy but baffled up it measures not to bad apart from the slight drop of 2db at 5k plus ish . This drop is not too wide and could you hear it ... I doubt it . Off axis ( which the manufacturer isnt keen on showing ) again is pretty good up to 45 degrees . it nose dives after that at 7 K plus . ) Perfect it aint . but at this money ..?.May be really well suited to a 2 way BBC smiley face FR monitor than 3 ways IMHO. Listening wise could you tell the difference , if unamended in the cross over definitely . Corrected ,,, the jury is out . Great value though and well put together . Thanks Will for pulling the stops out on this and continued top grade service .

Thankyou for your review !
Will & Caroline