Fantastic deal on MB Quart 95-6814, 8Ω, 2″ titanium dome midrange!

Legendary M.B. Quart Quality.

Engineered and manufactured in Germany. (!!)

2″ Titanium Dome with soft polymer (rubber-like) suspension for optimal damping.

Shallow chamber on the back to lower the resonance.

Unusually clean, detailed reproduction of midrange frequencies.

Metal grill with black diffuser under the grill.  Exceptional off axis response.  (See curve.)

Faceplate (overall) diameter 5.2″/132mm.

103mm cut out diameter (slight notches for terminals required.)  42mm mounting depth.  8Ω impedance. 

Square faceplate versions, without the diffuser, are also available here [8-ohm model # 95-7048] and here [4Ω model # 95-7045].

This unit is similar to the MB Quart MCD-51M, but with added the chamber.  It can be used as a substitute / replacement, in most instances, if the faceplate permits.  (If the faceplate / mounting is not compatible, you may want to look at one of the square faceplate models noted above.)

Individually inspected and tested @ PR Audio.

$37.00 each, any qty.; Matched pairs (±1dB 500-5000 Hz) $90/pr.;  Matched pairs (±1/2 dB 500-5000 Hz) $110/pr.  (Regular distributor price was $64.00 ea., retail - who knows?) 

For additional Ordering Information please click here.

Notes:

This driver is very clean and not harsh, even at quite high levels, with proper crossover.  However, due to the exceptional off axis response, a “hard” listening room may sound more so.  If your room tends that way, consider a midrange with less dispersion/higher directivity.  A vertical line or partial line source with multiple closely spaced drivers, is useful where floor and ceiling reflections are a problem.

Also note that the excellent dispersion/off axis response makes this a great midrange in car audio applications where the listener is off axis to the midrange speakers.  See the curves below. (Click the image for a clearer / enlarged graph.):

Red= close mic’d response, 1.414 volts.

Blue= 1.414 volts, 1/2 meter, 0°, raw data (no smoothing at all)

Magenta= 1.414 volts, 1/2 meter, 30°, raw data (no smoothing at all)

Yellow= 1.41. volts, 1/2 meter, 0°, .3octave smoothing, -10dB offset.

Note: The driver was not recessed into baffle (that would likely smooth the response somewhat, by eliminating diffraction effects at the outer edge of the unit.)  Also note 1.414 volts, 1/2 meter ≈ 2.828 volts, 1 meter, and 2.828 volts is a nominal 1 watt into a nominal 8Ω load.

We can provide pairs or sets with (slight) deliberate mismatch of the level (but very similar curves otherwise.)  This may be useful in certain applications.  (The mismatch will only be 2 dB or so, as these units have been testing unusually consistent in all regards.)  Contact Us for details.  A curve on a couple of well matched units (+/- .5 dB, 500-5000 Hz) can be viewed here: http://praudio.com/site/wp-content/uploads/2009/10/quart-98-6814-13-curve01024.gif
(This curve was taken @ 15 degress off axis, with .3 octave smoothing applied.)

Here are some more pictures, including several that detail the internal design of this unit.  Note for example the usage of two different damping materials:  Foam in the pole vent, and a batting-like material in the rear chamber.  Also of interest is the assymetrical bracing of the rear chamber which appears to also provide multiple sub-chambers of varying volume and damping:

(Click an image to enlarge it.  New images being uploaded, 10/3/09)