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Old 15th May 2014, 03:44 PM   #71
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Old 17th June 2014, 11:28 AM   #72
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Eventually got the HPF built using vero board , here's a piccy:
Click the image to open in full size.
I'm building this into a 3/way + HPF enclosure with associated power supply, progress here.

Thanks
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Old 23rd June 2014, 12:34 PM   #73
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You asked if every sub is suitable for hogh bpm...no. And 90 spl's from a deep going sub is pretty loud i can tell you. i'd prefer a 12 inch one since in theory it will make lower bases more easily, but the part about tuning is real interesting. But also check the differnt diagrams where the problem lay and you'll see that a couple of nice subs have their , let's say fase impedance sweep up point on 32 hz , but others ond 20, which make it far more easier with a simple high pass, with a steep 24db/oct around 24 hz and reach 30 hz as optimum . Besides the fact that good speakerbuilding can decrease the peak a llottt
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Old 24th June 2014, 10:51 AM   #74
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I'm implementing a 24dB/oct @ 22hz circuit (the one above).
I derived component values for the circuit by using this calculator.

winISD allows you to simulate filters and adjust filter values to generate a response and realise ideal response.

I saved myself from the hassle of buying a linkwitz transfrom circuit with a shortcut by doing the following:

1. Entering the above HPF values into the filter section available only in pro version of winISD
Do this by going to project window and selecting EQ/filter tab > Add > Highpass > Butterworth

In my case I added a 24dB/oct @ 22hz filter with values:
Order (n) = 4 (aka 24dB/oct)
Cuttoff (fc) = 22hz

2. Add a linkwitz transfrom filter to the EQ/filter list.
4. Experiment with different values until ideal response is realised.

5. Once happy go to the drop down at the top of the graph/chart window - change "transfer function" of the graph to "magnitude EQ/filter".

This gives you a final eq curve which you can apply to your signal path to replicate what a linkwitz transform would otherwise achieve on it's own.

In my case a 7db peak appeared at 25hz or so, this is what I will apply to my final signal in combination with the hpf.

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Last edited by giro1991; 24th June 2014 at 10:58 AM.
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Old 24th July 2014, 04:35 PM   #75
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Illustration to accompany instructions in previous post:
Click the image to open in full size.

Final response. I'll apply +7db @ 25hz to signal path using digital EQ.
Click the image to open in full size.

I will post in-room results soon.
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Old 25th July 2014, 10:46 AM   #76
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Cool!

Have you tried running laptop > amp > sub yet?

I know I could never resist...

Chris
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Old 25th July 2014, 02:28 PM   #77
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Alrrighty,

no not yet...

I'm configuring source to test 3-way/hpf combo.
I ran tests for 3way using right mark but got funny results - could be onboard sound, 3-way or maybe right mark config.

Going to install sound card and try again with with custom file via right mark (pink noise 24bit @ -20dbfs) to test individual bands of 3way xo.

I do seem to be getting heavy hum through the hpf though. (I tested through mains)

I'm certain I have hpf circuit connected up right.

For signal flow pins (inner jack) I have In/out respective of hpf circuits in/out.
For signal return rings (outer jack) I connected both rings to the common line on hpf circuit.

The nearby transformer is not the cause because 3way (sits right above hpf) does not hum.
Not sure what could be the cause...
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Last edited by giro1991; 25th July 2014 at 02:34 PM.
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Old 25th July 2014, 07:20 PM   #78
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Quote:
Originally Posted by giro1991 View Post
For signal flow pins (inner jack) I have In/out respective of hpf circuits in/out.
For signal return rings (outer jack) I connected both rings to the common line on hpf circuit.

The nearby transformer is not the cause because 3way (sits right above hpf) does not hum.
Not sure what could be the cause...
The cause of hum is usually a "ground loop", two paths (of differing resistance) of the signal to ground. Try eliminating one or both of the signal return ring connections to common, if the level remains the same and the hum goes away, problem solved. If not, audio isolation transformers may be required.
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Old 26th July 2014, 10:40 AM   #79
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A few alternatives below. Unsure which is more 'technically correct' though...

I'll try 'as suggested' first and post results.

thanks

Click the image to open in full size.
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