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Multi-Way Conventional loudspeakers with crossovers

Should I modify ADS L570/2 or Yamaha NS 670 speakers?
Should I modify ADS L570/2 or Yamaha NS 670 speakers?
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Old 6th March 2018, 12:38 PM   #41
Jimmy154 is offline Jimmy154  United States
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L8 -- 0.5 mH inductor has to be .49 ohm correct?
This re-occurred to me when I was using the Bagby Passive cross-over designer
I have lots of .5 mH inductors; but the smalled gauge ones tend not to be labelled
I can't find any 20 gauge labelled inductors

I couldn't model midrange cross-over on this designer
The woofer zobel helped, but 65-80 uF zobel cap does not model well, I think
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Old 6th March 2018, 12:55 PM   #42
Mrcloc is offline Mrcloc  South Africa
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Quote:
Originally Posted by Jimmy154 View Post
L8 -- 0.5 mH inductor has to be .49 ohm correct?
This re-occurred to me when I was using the Bagby Passive cross-over designer
I have lots of .5 mH inductors; but the smalled gauge ones tend not to be labelled
I can't find any 20 gauge labelled inductors
What about the resistance of the speaker wires? Or the wiring in the speaker? Or the amplifier output impedance? If 0.49 ohms is correct, what sort of tolerance have you got? I model my crossovers with a range of inductor resistance values to make sure it doesn't cause variation.
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Old 8th March 2018, 02:34 AM   #43
Jimmy154 is offline Jimmy154  United States
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Any one know how these vintage rifa caps sound?
I believe they are metalized paper
Pic is of the tweeter section
Oops it has the wrong caps (0.1uF); suppose to be 0.01uF but I won't use those anyway probably

Guess I will listen to them, but I'm not sure I have a golden ear

Turns out I have a 19 gauge or .91 mm diameter .5 mH inductor and a 14-16 gauge also I think
Attached Images
File Type: jpg IMG_20180307_205144.jpg (992.8 KB, 41 views)
File Type: jpg IMG_20180307_205257.jpg (639.7 KB, 40 views)
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Old 8th March 2018, 05:33 AM   #44
Mrcloc is offline Mrcloc  South Africa
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Any one know how these vintage rifa caps sound?
Hold them to your ear. I'm pretty sure they're as silent as any other capacitors.
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Old 25th April 2018, 05:41 PM   #45
Jimmy154 is offline Jimmy154  United States
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Can't hear difference between new and old x-over, except the midrange is a lot less efficient, as the excel spreadsheet told me it would be; even though I couldn't input all the components

Guess I'm not a very good "audiophile"

Took some measurement with old x-over, one with tweeter off and one with midrange off and one with tweeter and mid off
Mic was about 1.5 cm from the front of the mid/tweeter, woofer was about 3cm away

Woofer I could not turn of without opening box, so I skipped that
Aperiodic vent sounds better

Feel like the speakers are hissing at me, especially with human voice making "s" sound; but happens on my computer speakers too and speakers I had before
I mostly listen to youtube, mp3, mp4, other compressed audio

Can't play any FLAC files, so far

Included pic of Scanspeak aperiodic vent
I built a speaker with that before, Eton 8-800, excellent fast/tight bass
Seems as though you can compress fiberglass (or something else, I don't use fiberglass) to about 25% of it's original starting thickness as a good starting point
I used polyfill stuff between perforated sheet metal

Last pic is summed response of old cross-over where my head is, were I usually sit, I think

The scale says 20 dB on the scale, but I think it's about 10 dB, just looking at the cross-over roll off, but I really don't know

BTW, the cross-over was really time consuming and it did not help I used a bunch of little caps
If you can avoid a passive cross-over, you save a bunch of time and money, especially if you value your time and don't particularly enjoy soldering/ building cross-over
Not sure if people still use Pb solder; I think "ROHS" is lead free

Also, thanks to Zaph, even though I butcher his x-over in most peoples' eyes
I don't believe there is much "magic" in a cross-over and flat FR for that matter and I guess this project kind of proved it to me

But I don't know how "audiophiley" I am, since I like the sound of my old Bose 301's better than my current Usher 9950/8948 ported 2-way

The most annoying part(s) is the hissing which I have not measured in any FR measurement, with these speakers or others
and then the boominess of the woofer was kind of annoying before I put in the vent
Attached Images
File Type: png Screenshot_20180225-170938.png (162.0 KB, 22 views)
File Type: png Screenshot_20180225-171412.png (163.7 KB, 20 views)
File Type: png Screenshot_20180225-172330.png (150.1 KB, 20 views)
File Type: jpg ScanSpeak Aerovent.jpg (307.5 KB, 5 views)
File Type: jpg IMG_20180329_104634.jpg (987.8 KB, 7 views)
File Type: jpg IMG_20180329_104704.jpg (980.1 KB, 7 views)
File Type: jpg IMG_20180425_133521.jpg (1,013.8 KB, 8 views)
File Type: png Screenshot_20180226-132638.png (169.1 KB, 7 views)
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Old 25th April 2018, 06:31 PM   #46
lowmass is offline lowmass  United States
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"Vintage stuff is nice, but I don't want it "

I will take those "vintage" Yamaha drivers in a heart beat
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Old 25th April 2018, 07:14 PM   #47
phivates is offline phivates  United States
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Me too
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Old 25th April 2018, 07:30 PM   #48
chrisb is offline chrisb
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the enclosures as well, if they'd not been - ahem - modified during this experimentation
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