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Parts
List 

 

  

  
Part
  
  

  
Qty.
  
 
 

  

  
Scan-Speak
  18W/8535
  
  

  
2
  
 
 

  

  
Scan-Speak
  D2010/8513
  
  

  
2
  
 
 

  

  
Cabinets
  
  

  
2
  
 
 

  

  
3.4 µf capacitor
  
  

  
2
  
 
 

  

  
4.7 µf capacitor
  
  

  
2
  
 
 

  

  
7 uf (8.5 µf Chinese crossover) capacitor
  
  

  
2
  
 
 

  

  
47 ohm / 5 W resistor
  
  

  
4
  
 
 

  

  
5-9 ohm / 5 W resistor
  
  

  
2
  
 
 

  

  
0.25 mH inductor (air core)
  
  

  
2
  
 
 

  

  
0.82 or 0.83 mH inductor (air core)
  
  

  
2
  
 
 

  

  
1.8mH (1.5 mH Chinese crossover) inductor (air core)
  
  

  
2
  
 
 

  

  
Spikes
  
  

  
1 set
  
 
 

  

  
Terminal jacks, internal cabling
  
  

  
 
  
 
 

  

  
 
  
  

  
 
  
 


 

Optional
Modifications/Tweaks

Flared port;

Hi-end internal cabling like Nordost Blue Heaven, Audioquest etc;

Driver gaskets, (added routing depth required)

Air-core inductors of 12-13 gauge copper

Audiophile capacitors like Crescendo, Aeon, Solen etc. To save the cost of
using full uf value higher quality metal film capacitors you can simply connect
a low value 0.1uf capacity in parallel with a lower quality capacitor to
improve sound quality. This is highly recommended in the tweeter crossover
section.

 

Dimensions 
Width:
225mm

Height:
1020 mm

Depth:
255mm

Compensate
for any major internal volume (2 litres or more) changes if adding extensive
bracing.

Approximate
weight of finished speaker should be around 24kg/53lb, however choice of
lighter weight materials may not affect the sound. 

Port is
140mm long by 75mm internal diameter and located about 350mm from top of
cabinet, and if desired with internal flanges placed at both port ends inside
the cabinet to reduce air turbulence (use either 100 x 100mm square MDF which
can also brace side walls or PVC pipe flange) 

Tweeter
positioned 50mm from top of cabinet and off set 35mm from side edge (Note: CAD
drawing mistake should read 84mm from side of cabinet not 74mm), with 10mm gap
between drivers. Woofer located 25mm from side edges or centred in middle of
cabinet and 160mm from top. Both drivers are recessed into the cabinet.  

Cabinet
material and bracing: 25mm medium density fibreboard (MDF) front and back, 18mm
sides/top and bottom, single 150mm wide brace around the port or none at
all. 

It appears
some ProAc 2.5 models were braced while others are not and the choice is
entirely yours to make. Reports from builders indicate both sound very good.
CAD drawing brace shown is positioned under the port in the middle of the
cabinet height.  

Cabinet
lining is 3-5mm bituminous felt damping or similar mass loaded material,
30-50mm polyester (Dacron 200g/m2 density) stuffing/lining. Wall lining and
damping is added to all internal walls, except the front wall. It is important
not to over specify or use too much lining so the correct amount and density of
lining is used in order to maintain the same voice balance of the speaker. This
can have more effect on the sound than other over specified and expensive
crossover parts (capacitors and inductors). Over stuffed cabinets will result
in undesirable and constrained sounding speakers with less bass and midrange
voicing. If you cannot find the correct density or thickness, simply peel away
estimated amounts of lining.  

Cabinet
internal volume is 34 litres after wall damping is inserted. However, up to 38
litres volume have been reported to offer deeper bass extension. Changes to
cabinet dimensions for this should be done by increasing the depth and keeping
the front baffle dimension the same at 225mm.  

Install
25mm thick plinth that overlaps by 20mm on all sides, on spikes which improves
stability and bass response.