How to change active xover frecuencies - diyAudio
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Old 16th July 2014, 03:33 PM   #1
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Default How to change active xover frecuencies

How to change active xover frecuencies of Reckhorm F1 active xover, now the high cut adjustable 30-100Hz, low cut adjustable 50-100Hz.

I want to filter tweeter Seas Millenium TCF002 with a low cut filter 1.000Hz and advice for high cut filter for SS18W8545-00

Attached pics with schematic & manual.

All help will welcome.

TIA

Felipe
Attached Images
File Type: jpg Reckhorn active xover F1 Higher Output Voltage MOD.jpg (466.2 KB, 74 views)
Attached Files
File Type: pdf RECKHORM F1 ACTIVE XOVER manual_web.pdf (959.0 KB, 11 views)
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Old 16th July 2014, 03:44 PM   #2
AndrewT is offline AndrewT  Scotland
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The highlighted resistors are for gain setting.
But these gains are monstrously high @ +9.8dB and +20dB !!!!

The filters are the 8 opamps to the right.

All 8 are unity gain Sallen and Key.
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Last edited by AndrewT; 16th July 2014 at 03:47 PM.
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Old 16th July 2014, 03:46 PM   #3
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Thanks Andrew, how can change the frecuencies? yes the attached schematic is to change the xo for high gain.

Last edited by merlin el mago; 16th July 2014 at 03:55 PM.
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Old 16th July 2014, 03:57 PM   #4
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Technical data:

power supply 230 volts / 50 Hz or 110 volts / 60 Hz
input sensitivity 0.1 - 10 volts / 10 k ohms
satellite stereo signal output + 3 dB / 47 k ohms
satellite frequency response 50 - 40000 Hz -1 dB
satellite high pass, stereo, variabel 50 - 150 Hz / 24 dB
satellite total distortions 0.001 %
subwoofer 2 x mono signal outputs max. 10 volts / 47 k ohms
subwoofer frequency response 15 - 150 Hz -1 dB
subwoofer 2 x mono low pass variabel 40 - 150 Hz / 24 dB
subwoofer total distortions 0.001 %
signal - noise ratio subwoofer and satellites over 95 dB
power consumption with signal input max. 3 watts
power consumtion without signal max. 2.5 watts
width x height x depth (mm) 155 x 48 x 130
weight 0.7 kg
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Old 16th July 2014, 04:10 PM   #5
AndrewT is offline AndrewT  Scotland
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read up on
Quote:
unity gain Sallen and Key.
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Old 16th July 2014, 04:29 PM   #6
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Like the linkSallen-Key Low-Pass Filter?
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Old 16th July 2014, 04:48 PM   #7
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Active Filters



But it doesn't seem to be all that much like the ones described in
that article but I could be wrong.
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Old 16th July 2014, 07:03 PM   #8
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I got this schematic for Sallen-Key Butterworth High Pass Filter

Click the image to open in full size.

With the calculator online for 1KHz I got:

Ca 11.25nF
Cb 11.25nF
Ra 20K
Rb 10K

Are these values OK?

The schematic isn't the same like the reckhorn uses....

Last edited by merlin el mago; 16th July 2014 at 07:07 PM.
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Old 17th July 2014, 08:45 AM   #9
AndrewT is offline AndrewT  Scotland
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C1 = Ca
R19 = Ra
etc.
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Old 17th July 2014, 09:07 AM   #10
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