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Old 8th March 2014, 08:24 PM   #1
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Default active bass boost

I want to build a 2nd order active bass boost circuit for a boost of 10 dB @ 33 Hz.
I found some schematics, but don't you need a buffer stage of some sort? What about an input and output stage?

I don't know much about building these things, but I have built an active crossover before with step by step procedures. I don't really know how it works exactly so I am kinda flying blind here.

I have the components leftover from another project and I know the values of the resistors and caps. I need. I just need guidance on putting it together.
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Peerless 5.25", Dayton RS28F-4, active 4th order 1900 Hz, Dayton DVC 310-88 tuned to 20 Hz 4 ft³,active 4th order 133 Hz, Parasond HCA1500, Adcom GFA 535, Dayton DTA-120, Nak MR-1, B&O RX2
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Old 8th March 2014, 11:10 PM   #2
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Did some more research and after 7 hours I think I have something. Will this work?

Click the image to open in full size.
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Peerless 5.25", Dayton RS28F-4, active 4th order 1900 Hz, Dayton DVC 310-88 tuned to 20 Hz 4 ft³,active 4th order 133 Hz, Parasond HCA1500, Adcom GFA 535, Dayton DTA-120, Nak MR-1, B&O RX2
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Old 8th March 2014, 11:18 PM   #3
Zero D is offline Zero D  United Kingdom
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Hi, i can't view it on there, so please upload it directly to here
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Old 8th March 2014, 11:27 PM   #4
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How do I do that?
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Peerless 5.25", Dayton RS28F-4, active 4th order 1900 Hz, Dayton DVC 310-88 tuned to 20 Hz 4 ft³,active 4th order 133 Hz, Parasond HCA1500, Adcom GFA 535, Dayton DTA-120, Nak MR-1, B&O RX2
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Old 8th March 2014, 11:29 PM   #5
tinitus is offline tinitus  Europe
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subwoofer filter, gainer auto powe system
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Old 8th March 2014, 11:30 PM   #6
Zero D is offline Zero D  United Kingdom
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Click on this in the reply, then locate the Pic on your comp by clicking the Browse button & then click Upload
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File Type: png r.png (11.7 KB, 158 views)
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Old 8th March 2014, 11:30 PM   #7
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Can you see it now?

Click the image to open in full size.
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Peerless 5.25", Dayton RS28F-4, active 4th order 1900 Hz, Dayton DVC 310-88 tuned to 20 Hz 4 ft³,active 4th order 133 Hz, Parasond HCA1500, Adcom GFA 535, Dayton DTA-120, Nak MR-1, B&O RX2
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Old 8th March 2014, 11:32 PM   #8
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Ah! I think I have it now! Thank you1

active bass boost circuit small.jpg
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Peerless 5.25", Dayton RS28F-4, active 4th order 1900 Hz, Dayton DVC 310-88 tuned to 20 Hz 4 ft³,active 4th order 133 Hz, Parasond HCA1500, Adcom GFA 535, Dayton DTA-120, Nak MR-1, B&O RX2
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Old 8th March 2014, 11:35 PM   #9
Zero D is offline Zero D  United Kingdom
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I can see it now. That's a High Pass Filter, not a boost circuit. Plus there's a lot wrong with it. I have to go eat now, but i'll post back to you later
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Old 8th March 2014, 11:59 PM   #10
sreten is offline sreten  United Kingdom
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Hi,

A peaking high pass is generally better than a peaking all pass in the bass.
For higher boosts a peaking second order is best combined with a 1st
order low pass step filter, often very easy to do passively.

rgds, sreten.
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