Does anybody know where I can find the specs for a Focal 7C013 woofer and a Focal T121 tweeter?
I have embarked on a speaker refurbishing project and planned to get some crossovers specifically designed.
The current crossovers are away from the cabinet, however the previous owner must have run out of funds/diligence because some cheap J-Car ones were used.
The inside dimensions of the box are 623mm high x 198mm wide x 241mm deep. The inside is lined with lined with 13mm bituminised panels on all surfaces. The steel port is 65mm wide 80 mm deep (made of very thin metal) with the lower edge located about 3-4 cm from the bottom.
The outside measurements are: 1243mm high x 265 wide x 31 deep. It is made of 35m particle board and each box weighs about 40kg.
I have embarked on a speaker refurbishing project and planned to get some crossovers specifically designed.
The current crossovers are away from the cabinet, however the previous owner must have run out of funds/diligence because some cheap J-Car ones were used.
The inside dimensions of the box are 623mm high x 198mm wide x 241mm deep. The inside is lined with lined with 13mm bituminised panels on all surfaces. The steel port is 65mm wide 80 mm deep (made of very thin metal) with the lower edge located about 3-4 cm from the bottom.
The outside measurements are: 1243mm high x 265 wide x 31 deep. It is made of 35m particle board and each box weighs about 40kg.
In the absence of specs I have tried to determine what they might be as follows.
The volume of the enclosure is 1 cubic foot.
Assuming this was the optimum volume calculated, I plugged in the other available Focal 7 woofers specs into multiplier graphs and calculations.
The 7v013 came out exactly at 1 cu. f. in obtaining the "optimum volume". Ref: Building speaker systems - Speakers for your listening pleasure; by Gordon McComb, Alvis J. Evans, Eric J. Evans.
Qts = .344
Vas = 51 litres = 1.8 cubic feet
Fs = 40.4 Hz
Tuning frequency = 39.6 Hz
I.e.
Volume multiplier for this Qts is 0.56
The optimum volume is therefore 0.56 x 1.8 = 1
Tuning frequency factor for this Qts is 0.98
Tuning frequency is therefore 0.98 x 40.4 = 39.6
The volume of the enclosure is 1 cubic foot.
Assuming this was the optimum volume calculated, I plugged in the other available Focal 7 woofers specs into multiplier graphs and calculations.
The 7v013 came out exactly at 1 cu. f. in obtaining the "optimum volume". Ref: Building speaker systems - Speakers for your listening pleasure; by Gordon McComb, Alvis J. Evans, Eric J. Evans.
Qts = .344
Vas = 51 litres = 1.8 cubic feet
Fs = 40.4 Hz
Tuning frequency = 39.6 Hz
I.e.
Volume multiplier for this Qts is 0.56
The optimum volume is therefore 0.56 x 1.8 = 1
Tuning frequency factor for this Qts is 0.98
Tuning frequency is therefore 0.98 x 40.4 = 39.6
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