Hi all,
I recently acquired a Sony SA-WMSP87 amplifier which has a mono input, and am needing a low pass filter as I currently only have a 3.5mm to rca jack as an input (homemade, joined L/R connections of the 3.5mm cable together and connected to 1 rca cable along with the ground). The subwoofer only has a mono rca input, so I'm looking for something cheap to use as a low pass filter to cut out frequencies >90-100Hz. Would something like this diy board suffice? - NE5532 LOW Pass Filter Subwoofer Process Circuit Frequency Volume FOR Amplifer | eBay
Something like this even? http://www.ebay.com.au/itm/100Hz-lo...602?pt=LH_DefaultDomain_0&hash=item1c495a3fb2
If so, how would I safely connect it to the subwoofer over RCA? The source is a HifimeDIY Sabre DAC which puts out well enough power for the sub.
I'm quite new to this stuff so sorry if I'm not being informative enough.
I recently acquired a Sony SA-WMSP87 amplifier which has a mono input, and am needing a low pass filter as I currently only have a 3.5mm to rca jack as an input (homemade, joined L/R connections of the 3.5mm cable together and connected to 1 rca cable along with the ground). The subwoofer only has a mono rca input, so I'm looking for something cheap to use as a low pass filter to cut out frequencies >90-100Hz. Would something like this diy board suffice? - NE5532 LOW Pass Filter Subwoofer Process Circuit Frequency Volume FOR Amplifer | eBay
Something like this even? http://www.ebay.com.au/itm/100Hz-lo...602?pt=LH_DefaultDomain_0&hash=item1c495a3fb2
If so, how would I safely connect it to the subwoofer over RCA? The source is a HifimeDIY Sabre DAC which puts out well enough power for the sub.
I'm quite new to this stuff so sorry if I'm not being informative enough.
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It's not a good idea to wye two signals (L&R) to one input. So you will need to add 2 resistors to your filter.
Why Not Wye?
Dennis Bohn, Rane Corporation
RaneNote 109 written 1991; last revised 4/04
Splitting Signals
Subwoofing in Mono
Unbalanced Summing
Balanced Summing
Output Impedances
Why Not Wye?
Why Not Wye?
Dennis Bohn, Rane Corporation
RaneNote 109 written 1991; last revised 4/04
Splitting Signals
Subwoofing in Mono
Unbalanced Summing
Balanced Summing
Output Impedances
Why Not Wye?
use a two input inverting MFB 2pole filter as your SUMMING amp and as your Low Pass Filter.
If you require more than two pole, you can add another 2pole filter stage, either MFB to invert the signal back to normal, or a Salen and Key to keep the inverted signal (to be corrected later, like swapping the speaker leads).
If you require more than two pole, you can add another 2pole filter stage, either MFB to invert the signal back to normal, or a Salen and Key to keep the inverted signal (to be corrected later, like swapping the speaker leads).
i own exactly the same board from ebay.
but i don´t use it since i learned how to build active filters.
for home subwoofers a 3rd order mfb filter (18db) should be enough.
here you can calculate your own:
3rd order Multiple feedback Low-pass Filter Design Tool
put an inverting summer in front of it.
a single TL072 opamp is enough for this application.
but i don´t use it since i learned how to build active filters.
for home subwoofers a 3rd order mfb filter (18db) should be enough.
here you can calculate your own:
3rd order Multiple feedback Low-pass Filter Design Tool
put an inverting summer in front of it.
a single TL072 opamp is enough for this application.
Syrincs Subcontrol II with variable 4rd order low pass according Sallen-Key
This device is for me the best available low-cost device - actually made for car-hifi, but also good suited for home-audio. variable 4rd or low pass filter and variable subsonic filter are inside. Individual modifications are very easy.
Instruction manual is here:
http://www.syrincs.de/new/manual/mansc2.pdf
schematic, which I have created some time ago is here
This device is for me the best available low-cost device - actually made for car-hifi, but also good suited for home-audio. variable 4rd or low pass filter and variable subsonic filter are inside. Individual modifications are very easy.
Instruction manual is here:
http://www.syrincs.de/new/manual/mansc2.pdf
schematic, which I have created some time ago is here
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another active filter device, which consist also of a low pass and high pass (subsonic) filter is the Hormann AX2:
http://www.hormann-audio.de/viewart...hen/1261-subwoofer-weiche-ax2/description.htm
Who can upload the schematic diagram?
Also of interest is this filter device: Bryston 10B-STD Electronic Crossover
http://www.bryston.com/products/other/10B-STD.html
http://www.bryston.com/PDF/Manuals/300001[10B].pdf
http://www.6moons.com/audioreviews/bryston2/crossover_3.html
My own circuit design looks as follow:
1) summing amp (like syrincs subcontrol II)
2) continue variable high pass, two 12db sections in serial, each 12db a stereo potentiometer (at whole 24db/oct, 4rd order)
3) continue variable low pass, three 12db sections in serial, each 12db a stereo potentiometer (at whole 36db/oct, 6rd order)
Are there such a subwoofer active crossover on the marked in the same kind as the devices above ?
http://www.hormann-audio.de/viewart...hen/1261-subwoofer-weiche-ax2/description.htm
Who can upload the schematic diagram?
Also of interest is this filter device: Bryston 10B-STD Electronic Crossover
http://www.bryston.com/products/other/10B-STD.html
http://www.bryston.com/PDF/Manuals/300001[10B].pdf
http://www.6moons.com/audioreviews/bryston2/crossover_3.html
My own circuit design looks as follow:
1) summing amp (like syrincs subcontrol II)
2) continue variable high pass, two 12db sections in serial, each 12db a stereo potentiometer (at whole 24db/oct, 4rd order)
3) continue variable low pass, three 12db sections in serial, each 12db a stereo potentiometer (at whole 36db/oct, 6rd order)
Are there such a subwoofer active crossover on the marked in the same kind as the devices above ?
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No - go to
Hormann Audio - Subwoofer-Weiche AX2 - Beschreibung
If the website don't goes open, go to
Wayback Machine
and fill in the exact genuine URL.
And an offer in used condition from Germany:
Aktivweiche SUPAvox AX2, Hormann Audio in Hessen - Wehretal | Weitere Audio & Hifi Komponenten gebraucht kaufen | eBay Kleinanzeigen
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first URL in post #10 is dead. go to
https://web.archive.org/web/2016010...hen/1261-subwoofer-weiche-ax2/description.htm
This active crossover network is out of production - even this one:
http://www.syrincs-audiotechnik.de/new/manual/mansc2.pdf
Are there good available alternatives - maybe from the car hifi product range (except DSP crossover network) ?
https://web.archive.org/web/2016010...hen/1261-subwoofer-weiche-ax2/description.htm
This active crossover network is out of production - even this one:
http://www.syrincs-audiotechnik.de/new/manual/mansc2.pdf
Are there good available alternatives - maybe from the car hifi product range (except DSP crossover network) ?
Who know the differences (or can upload the schematic) of the predecessor from SYRINCS, model "SubControl" ?
In the attachment some images.
Attachments
How about Marchand Electronics.
Pre-made Linkwitz-Riley 4th order, 24dB/oct, 2-way high and low-pass PCB. Crossover point Fc controls both the sub amp and the main amp for full separation of duties. Fc is set with a four resistor DIP-8 plug-in “Frequency Module”. You DIY your own High or Low output level control, phase, enclosure, bipolar ±12V or ±15V power supply, etc. You can ask for Frequency Module blanks and stuff your own Rs
XM1 Electronic Crossover Network
Or here’s their full-blown Linkwitz-Riley 4th order, 24dB/oct, 2-way high and low-pass electronic crossover product.
XM9 Electronic Crossover
Pre-made Linkwitz-Riley 4th order, 24dB/oct, 2-way high and low-pass PCB. Crossover point Fc controls both the sub amp and the main amp for full separation of duties. Fc is set with a four resistor DIP-8 plug-in “Frequency Module”. You DIY your own High or Low output level control, phase, enclosure, bipolar ±12V or ±15V power supply, etc. You can ask for Frequency Module blanks and stuff your own Rs
XM1 Electronic Crossover Network
Or here’s their full-blown Linkwitz-Riley 4th order, 24dB/oct, 2-way high and low-pass electronic crossover product.
XM9 Electronic Crossover