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For Sale Alpine 3672 6-way reference level active analogue crossover

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Kannan

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An unused Alpine 3672 6-way active crossover

I am listing an absolutely rare pure analogue Alpine 3672 active crossover for sale.
It is an unused piece, though original packing is not available.

This is the highest level crossover made for someone taking a puritan approach to active crossovers in the analogue chain after the DAC.
This will work as a pure crossover without any ADC/DAC conversions, thereby retaining the original signature of the DAC.

One can go 6-way active with this, 4-way active (front stage) plus 2-way for rear as well at the same time.

It is a reference grade crossover made with audiophile grade components, and is priced accordingly and is not negotiable.

You will need a 12 volt powers supply to use it at home.
In car it can be used natively.

Price: Rs. 39,500

Specifications:
Number of analogue Inputs : 4
Number of Analogue Outputs : 6 (fully configurable)

Possible system configurations :
CH 1/2: 1 or 2 way
CH 3/4: 1, 2 or 3 way
SUBWOOFER

CH 1/2 Crossover Section Frequencies :
WOOFER: Low Pass Filters: 50 Hz - 800 Hz (continuously variable)
WOOFER/TWEETER: 3 kHz — 10 kHz (continuously variable)

CH 3/4 Crossover Section Frequencies :
In this configuration, the midbass and midrange can be band passed.

MIDBASS: High Pass / Low Pass: 10 Hz - 120 Hz / 200 Hz - 2 kHz
(continuously variable)
MIDRANGE: High Pass / Low Pass: 200 Hz - 2 kHz / 3 kHz - 10 kHz
(continuously variable)
TWEETER: High Pass: 3 kHz - 10 kHz (continuously variable)

SUBWOOFER Crossover : Low Pass Filter: 50Hz - 120Hz (continuously variable)

Output level controls :
Subwoofer: 0 to +12db
Other Channels : -6db to +6db

Subwoofer Slope: 3rd Order butterworth: 18db/oct
Other Channel Slopes: 2nd Order butterworth: (12db/oct)

Frequency Response : 10 Hz - 50 kHz (+0, -1 db)
Signal to Noise Ratio : 110 dBA
Input Sensitivity : 500mV - 9 volts
Max output : 9 volts
Input impedance : 10 kilo ohm minimum
Output impedance : 1 kilo ohm max
All Gold Plated terminals (power, input, output)

Link to photo album

Sharing some images

aline 3.jpg

alpine 1.jpg

alpine 2.jpg
 

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Kannan

Well-Known Member
Joined
Jan 13, 2008
Messages
2,006
Points
113
Location
Chennai
Some clarification regarding the product as I had received some doubts about its use.

This is an analogue crossover, so sits after the prreamplifier.
It will be the last in the chain before the power amps.
There is no analogue to digital and back to analogue conversion (ADCDAC).
You can split frequencies between four drivers (subwoofer, midbass, midrange and tweeter).
Yes all crossover changes can be done on the fly while tuning.
The number of power amplifiers will depend in the number of driver pairs (Three power amps for 3-way, 2-power amps for 2-way, and so on).
The gain matching control on each output is not a volume control. It is used to match the spl of the drivers and match to the preamp output.
 

Kannan

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Joined
Jan 13, 2008
Messages
2,006
Points
113
Location
Chennai
Payment recd. Will be shipped out today.
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