Troels NOMEX 164: any thoughts - Page 10 - diyAudio
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Multi-Way Conventional loudspeakers with crossovers

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Old 24th November 2012, 11:59 AM   #91
jlaakso is offline jlaakso  Finland
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Too much stuffing might "kill" the midrange and make the speaker sound dull. In my Ellams I originally had too much sonofil behind the woofers and it made the sound suppressed and dull. I took half sheet out and now the midrange is clear and present. You could try taking some stuffing out, but remember that your speakers are still running in. IMO you should let them play for couple of weeks, and don't be afraid to crank up the volume every now and then. After the woofers have broke in, the tonal balance will be different. That way you also adapt to the sound and start to recognize their character.
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Old 24th November 2012, 04:43 PM   #92
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Quote:
Are you changing R1051 and R1061? Is that how you are attenuating the tweeter?
Answer is : YES

+1
you should let them play for couple of weeks

PS: got the new resistors R1051 and R1061 in my pocket
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Old 25th November 2012, 11:36 AM   #93
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I've changed the L-pad resistors R1051 and R1061, new values are 1.2 ohms and 15 ohms.
I can say that the tonal balance is much better.

I can say it's OK at 70% volume of my m-audio 2496 card connected to my poppulse T150 Tamp with the volume pot bypassed.
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Old 26th November 2012, 01:59 AM   #94
satx is offline satx  United States
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Hi,
I'm using an online calculator to determine port length and the numbers that it is providing are different from the numbers that Troels specifies. Troels says that for a 2.68" id port to cut it to 2.36" for a port tuning of 45hz for the 40L Nomex build. The calculator calls for a 2.68 id port to be cut to 3.4" length for 45hz in 40L. What gives? I'm am actually using a 2.5" port and have tried a couple of different lengths for different tuning, but now I'm not sure if I have it tuned to what I thought. I currently have It cut to 4" for a presumed tuning of about 40hz.

Can anyone shed any light here.

Thanks
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Old 26th November 2012, 05:47 AM   #95
jlaakso is offline jlaakso  Finland
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Let me run my sheets and i will give You some sort of estimate for the port length, regarding port tuning 40Hz. What size is your cabinet? 34l, 40l, something else?
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Old 26th November 2012, 05:57 AM   #96
jlaakso is offline jlaakso  Finland
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According to my calculations:

34l cab, 2.5" port dia, Fb=40Hz -> 3.45" port length
40l cab, 2.5" port dia, Fb=40Hz -> 2.75" port length

I used speakerboxdesigner worksheets and multiplied the port length with 0.7 (I do not know where this factor is from, but Troels uses it when determining port lengths).
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Old 26th November 2012, 05:58 AM   #97
satx is offline satx  United States
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40L I also would like to try his recommended tuning of 45hz. Maybe it is because of stuffing?
Anyways, thanks
Evan
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Old 26th November 2012, 06:02 AM   #98
satx is offline satx  United States
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Ah, thanks. I'll try that. My calculator says that 2.75 is 41-42hz. That's actually not too far off. His suggestions for 45hz with the jantzen port in the 40L is more than an inch different from the calculator.
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Old 26th November 2012, 06:05 AM   #99
satx is offline satx  United States
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Correction on above. I do not currently have port cut to 4" for a fb of 40. It is actually 2.75" for what I thought was 42hz. Not sure where I got the above numbers.
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Old 26th November 2012, 08:15 AM   #100
jlaakso is offline jlaakso  Finland
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The actual port length depends on how it is flared. Do not spend too much time on deciding which port length and which exact tuning point you want to have. Think of them as suggestions and basis for tuning by your ears (and possibly with impedance and/or FR plots) to get your preferred sound. If it suits you, it doesn't matter if the actual tuning is 40Hz or 45Hz. If the bass output is too dominant and heavy, lowering the tuning will help in most of the cases. If it is OK by your means of evalution, then You don't have to any changes. And have patience with the running in period The tonal balance will have changes within couple of weeks.
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