NRPavs   SOLD items 2010 archive 1  Spendor  BC1 front speakers details
SOLD items 2010 archive 1 product details : 

Spendor    BC1
front  speakers
Spendor  BC1  speakers : 3-way   cream / blue fleck cloth
Spendor  BC1  speakers  : grilles off
Spendor  BC1  speakers :   drivers detail
Spendor  BC1  : superb woodgrain finish
Spendor  BC1  speakers : upwards view
Spendor  BC1  speaker binding posts replaced
Spendor  BC1  speakers : grilles on
Spendor  BC1  speakers : better sound with the grille off
SOLD May 2010 to Forrest Hill, North Shore City
S/Ns: 1055 / 1056
  Spendor  BC1  front  speakers specifications                  Back to NRPavs Home  
    Spendor  BC1  3-way   monitors
Details for the BC1 model to be updated during testing

There is a great deal of information about Spendor speakers and this BC1 model on the internet and at the Spendor website history section
I will try to edit some comments for this description section - my own initial assessment is that they deserve their ground-breaking reputation, and look forward to further improvement by careful components or hardware updating
The BC1s have now been completely restored : it is a great privilege and pleasure to listen to the BC1s

Specifications :
  -:®:-   Power rating : 15 - 55 watts
  -:®:-   Pair matching: within 1 dB
  -:®:-   Nominal Impedance : 8 ohms  minimum 9 ohms
  -:®:-   Drivers : woofer: Spendor BC1 mid bass 200mm Bextrene cone 26mm coil
  -:®:-   Tweeters : Celestion HP1300 hard dome   Coles 4001G supertweeter
  -:®:-   Crossover Frequencies : 3,000Hz and 13kHz
  -:®:-   Sensitivity : 86.8dB / 1W / 1m
  -:®:-   Frequency response : 50 Hz to 15 kHz, 3dB
  -:®:-   Dimensions [ W x D x H ]: 300 x 300 x 640mm
  -:®:-   Weight : 14.0kg each speaker, 16kg each packed

   Restoration summary :
Modify a test speaker by moving the crossover mounting and replacing connection wires to compare with original,
then modify the other, fit correct ports and optimize the port length

   Feb [2/4] restoration completed :  Both speakers upgraded, sand and oil cabinets finished
Listening tests prior to fitting vents, crossovers moved, new cable, vents fitted and tested 28Hz resonance

  1] Vent tubes missing and internal vent foam - to be replaced, modelling work done for vent length, no foam needed
Vents 50mm diameter inserted - fine tuning of vent length for 28Hz - 110mm is correct length
Initial results give decrease in efficiency, tighter bass, less woofer extension for same source music as original
Further running-in of new crossover wires and added port reveals successful restoration - great deal of improvement so far
Test cd reveals tight bass, excellent attack and damping, crisp upper frequencies - in short, monitor quality
Woofer rotated 144 degrees - occasional rotation recommended to stop any sag from constant gravity pull when not active

  2] Crossover to be re-positioned to minimize wire lengths, wire to be updated on all drivers, components OK
Crossover secured using inductor bolt and fixing wooden block - inductors damped with non-slip matting
Wire runs to each driver are now much shorter and neater
All wire runs are twisted pairs like the original wiring

Test speaker wired with DH Labs silver wire for tweeter and super-tweeter, Mogami wire for posts-to-crossover link and woofer wires

  3] Cabinets sand and teak oil

  4] Speaker binding posts to be updated for larger diameter wire and banana plugs capable
New binding posts fitted - takes 4mm - 5mm cable   banana plugs capable
   Mogami wires from speaker post tags up to the crossover

  5] Grilles off is preferred
Repair to cloth tear - grilles attach simply using velcro strips

   SOLD May 2010 to Forrest Hill, North Shore City


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