Markaudio

Combining the Alpair 5 Copper Gold with the SDX7 presents system builders with a great opportunity to have possibly one of the best 2 way speaker combinations currently available. The Alpair 5’s clarity and detail matched with the SDX’7 powerful tight bass, together delivers superb music reproduction.

System builders have a very wide choice of crossover points, anywhere from 150Hz to 5000kHz depending on personal preferences and box designs.

Suggested Enclosure

Here is a 15-litre size enclosure using the classic ported box design:

These dimensions are a guide and can be varied up to 15 % in box volume for suit personal taste.

Build Recommendations

• Internal Height: 25cm
• Internal Width: 40cm
• Internal Depth: 16cm
• Internal sealed compartment for Alpair 5 driver: 0.6 to 1.0 litres.
• Port internal diameter: 2.54cm
• Port length: 4.5cm
• Port location: position port with minimum 3cm clearance from internal enclosure base.
• Alpair 5 and SDX7 locations = can be placed for personal preference. We recommend the Alpair 5 be fitted into a sealed compartment at the top with the SDX7 in the lower part of the enclosure.
• Material thickness recommendation: MDF board 15mm to 20mm, natural soft woods 20mm, natural hard woods 15mm.
• Damping material recommendation: 25mm thick open cell low-density foam, low-density wool and similar fibres.

Crossover

The crossover point can be very wide (from 200Hz to 5000kHz) giving much personal choice. We suggest crossing over at around 1000Hz using a simple 1st order crossover. The circuit is included in our line drawing.

• Crossover point: 1000Hz
• Resistor recommendation: A resistor will help balance the load between the Alpair 5 and the SDX7. We suggest a 10 watt wire wound type with a value of 4 to 6 ohms.
• Capacitor recommendation: Use a good quality audio cap, values between 100v to 250v and 20.0 uF.
• Inductor recommendation: Use a genuine good quality iron or steel core inductor with an ultra-low DCR with a value around 1.0 to mH.

Please Note: These figures are to use as a guide. It is recommended that system builders do sufficient research to be satisfied with their design. Box dimensions, port size/length and position and crossover points can be varied to suit personal tastes.

Have fun and enjoy the music!

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Package 1 - 2 Pairs of Alpair 5
+1 Pair SDX7 Woofers
Package 2 - 2 Pairs of Alpair 5
+ 2 Pairs of SDX7 Woofers