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Multi-Way Conventional loudspeakers with crossovers

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Old 28th December 2003, 01:29 PM   #1
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Join Date: Dec 2003
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Default proac info.

hmmm just been looking for some stuff and seen how many questions realate to proac. I thought I would share a little of my hard earned knowledge.
for some great proac klones check this out.

http://audioclone.free.fr/scanspeak.html

Older proacs are divided into 3 ranges,

1/the tablette
2/studio
3/ response

tablette 3, 50, 2000 inc. signatures use seas woofers and seas or scanspeak tweeters...2010 on signatures.

studio 1, 100, 200 use scanspeak 8543 paper woofers and seas tweeters
studio 125 are like the tablette 2000, and use seas woofer
studio 150 use seas p14 woofers, and scanspeak 2008 tweeter.

response 1s use seas t14 woofer, scanspeak 2010 tweeter,
reponse 2.5, well you know!!
reponse 3 and 3.5 both scanspeak polypropylene woofers, scanspeak 9000 series tweeters
response 3.8 uses 2x 8535 woofers, 9300 tweeter
response 5 2x8535, atc mid, 2010 tweeter
response 4 atc 9 inch short voice coil woofers, atc mid, scanspeak tweeter.

crossovers: the standard proac crossover is 2nd order in the bass, 3 order in the tweeter, with one attenuation resistor as the first component in the tweeter. No L-pads here.

They are in phase, but the components are the opposite way around, ie in the negative path rather than the positive.

With the 2.5, the bass is 3rd order,a change for proac with a 47 ohm resistor across the first inductor.

The 3.8 crossover is 2nd order on the bass unit, at 300 hz, and the rest I think is identical to the 2.5 ie 3rd order midbass, 3rd order tweeter.

With the scanspeak woofers, no resonant filter is used, but with seas, a series RLC circuit in that order R, then iron core L, then C is used, ACROSS the woofer.

The cabinets are lined with bitumen and acoustic foam, terminals are michell rhodium plate.

latest response d100 uses Volt 2500 woofers, atc mids.
tablette R8 uses vifa premium line 14 woofer, and premium line tweeter.

series RLC on the seas woofers comes after the bass inductor but before the parallel capacitor.

Values are typically: 4.7 ohms for the tweeter resistor, 5uf cap, choke, 6.8uf cap

woofer: choke, 10 ohm resistor, choke, 20-40uf cap in parallel with woofer, 5uf cap parallel with woofer.


that's about it, good luck....
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