Audaphon Pro PA Kit D3672-2-K12

D3300-2-K12
Technical data:
- Nominal power handling: 800 Watt
- Impedance: 4 Ohm
- Nominal SPL (2.83V/1m): 103 dB
- Maximum SPL: 130 dB (peak/1m)
- Frequency range (-8dB): 60-16 000 Hz
- Crossover frequency 1270 Hz
- Size (HxWxD): 94 x 41.6 x 30 cm

D3672-2-K12 is a high performance full range loudspeaker with 2 x 12'' / 1 x 1.4'' drivers. This speaker shows a wide dispersion over the entire frequency range.

... A feature seldom found on high performance speakers this size: the phase response is correct from 2 metres to beyond 20 metres (for measuring and theory see below).

This speaker was designed for high power handling and absolute hi-fi; applications: PA, cinema, monitoring as well as reproduction of classical music in large listening rooms. The original cabinets (see picture) were designed without the projecting side panels to ensure absolute top performance.

When using this type of speaker certain rules should be followed: For top hi-fi reproduction the horn should be at ears' height. To have the loudspeaker at ears' height is sufficient at a distance of more than 4 metres.

As tweeter the D3672, a 1.4'' Oberton driver with Oberton H955 Horn was chosen. This is the best 1.4'' tweeter we could find in this price range.

Two Eminence Kappa 12 were used for bass, a well priced and very efficient driver.

Trapezoid Cabinet
If several loudspeakers need to be placed side by side the cabinets should be of trapezoid form.

Frequency response

The following frequency response was measured with a calibrated Clio microphone, without any projecting edges. The cabinet was not damped (for PA speakers that's common).
  Frequenzgang

Picture above: the frequency response with very small irregularities; when measuring with third noise the small is drop is hardly noticeable (upon request we'll mail the measuring result to you).

The crossover is exceptional: both drivers are in phase (the intersection of both lines is approx. 6 dB below the total frequency curve).

Picture below: below 0, 15, 30, 45 degree angle (horizontal deviation) from the axis, the lower crossover frequency becomes noticeable. At this frequency the 12'' drivers (they are working up to 1.3 kHz) are still radiating with a wide dispersion.
  Frequenzgang

 
Sound pressure level
(height in the picture)
was chosen arbitrarily.

Important for excellent sound is the quick excursion of drivers shown in the following diagram as rapidly declining volume toward the front. This is successfully achieved.
 

Distance to speakers

Large arrays of drivers where the mid frequencies (e.g. 2 kHz) are produced by more than two speakers show the inherent, distance related fault (some theoretical information) of cancelling out frequencies just above or below the crossover frequency between drivers.

A great deal of energy has been mustered to eliminate this fault.

Picture left:
Frequency response
depending on listener
position respectively
measuring distance.

Sound pressure level
(height in the picture)
was chosen arbitrarily.

After a long time of research the dependency is perfectly low: at 2 metre distance a small anomaly is noticeable at 1200 Hz; the red line shows a slight drop of the sound pressure level.

The cabinet


The cabinet consists of 19 mm boards; it's easy to build since all panels are fitted in a right angle. The bass reflex port entry should be countersunk by cutting the baffle and the side wall at an angle ensuring a port that is 50 mm wide.

The crossover components should be mounted on a wooden board and then fitted in empty space. The terminal should be mounted on the rear panel of the cabinet.

The napped foam should be cut in half ad fitted to the rear wall leaving the bass reflex port uncovered.

If the speaker is transported frequently 4 magnet carriers should be attached: the two panels in the drawing that are attached to the rear wall extend from the left bracing panel to the right bracing panel. Two additional panels may be fitted to prevent lateral movement.

Trapezoid cabinet: woodworking experts prefer to build a trapezoid cabinet: either with 5 degrees angle on both sides or 10 degrees on one side (opposing the side where the bass reflex port is). The cabinet's rear wall will then be 4.9 mm smaller than the baffle. In order to keep the same volume the cabinet should be made 3.5 cm deeper, resulting in a real wall that is 5.6 smaller than the baffle.

Satellite application: in case the loudspeaker is always used in conjunction with a subwoofer, the bass reflex port may be omitted. The cabinet may then be build to a size just big enough for accommodating the drivers. Even with its small 44 litre trapezoid cabinet the frequency range starts at 60 / 100 Hz (at -8 / -3 dB). Woodworking experts prefer to build a trapezoid cabinet: either with 5 degrees angle on both sides or 10 degrees on one side (opposing the side where the bass reflex port is). The cabinet's rear wall will then be 4.9 mm smaller than the baffle. In order to keep the same volume the cabinet should be made 3.5 cm deeper, resulting in a real wall that is 5.6 smaller than the baffle.

The crossover

The crossover consists of high quality components (foil capacitors, air core coils and one i-point core coil.

Our kit

The D2544-D10 Kit consists of:
- 1 x Oberton H955, 1.4 '' Horn
- with D3672 Oberton driver
- 2 x Eminence Kappa 12 bass driver
- 2x Neutrik Speakon NL4MPR socket, round
- 1/2 sealing tape
- 1/2 mat napped foam N25
- 16 x Allen screws 5 x 30 mm
- 12 x PAN screws 3.5 x 17 mm
- 3 metre cable 2 x 1.5 mm2
- building instruction

  and for the crossover,
  to be mounted on wood:
- protection element
- 2 x high power handling i-point core coils
- air core coil 1.2 mH / 1.0 mm
- air core coil 0.27 mH / 1.0 mm
- 47 uF / 160V MKT capacitors
- 2x 3.9 uF / 400V MKP capacitor
- 6.8 uF / 400V MKP capacitor
- 15 Ohm resistors, 20 Watts
- 6.8 Ohm resistors, 20 Watts

Price per unit without cabinet and wood:   EUR 658,00 excl. VAT: € 552.94 / $ 516.77

Hint: upon request we also supply - instead of Speakon connector - a terminal with 2 gold plated brass binding posts at no additional charge.

If you prefer to mount the crossover components on a Cu PCB instead on wood:
Price for PCB 205 x 140 mm EUR 11,70 excl. VAT: € 9.83 / $ 9.19

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