Alpair 5 / SDX7 Team

Alpair 5 and SDX7

Markaudio's Alpair 5 Copper-Gold Teams Up With CSS's SDX7 Woofer

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 SDX7's 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.

Build Recommendations

  • Internal Height: 25cm
  • Internal Wilih: 40cm
  • Internal Depth: 16cm
  • Internal sealed compartment for Alpair 5 driver: 0.6~1.0 litres.
  • Port internal diameter: 2.54cm
  • Port length: 4.5cm
  • Port location: Position port with minimum 3cm clearance from internal enclosure base.
  • The Alpair 5 and SDX7 can be placed in any location 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.
Alpair 5 and SDX7

15L Size 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.