Inexpensive entry to the world of Tapped Horn subs... - Page 3 - diyAudio
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Old 3rd December 2012, 12:00 AM   #21
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I just realized I'd never posted the Hornresponse plots
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File Type: jpg Response.jpg (85.5 KB, 301 views)
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Old 3rd December 2012, 12:29 AM   #22
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Okay I was able to do a quick impedance sweep. Which took two hours, because Praxis was being weird. My thoughts:

1. It's even closer than I expected...even up to the higher order modes.
2. Looks like some bracing around the mouth might be in order...even for this sub.
3. Looks like the copper pole cap is doing it's job on inductance, though the higher than predicted impedance in the 300Hz to 2kHz is a bit weird.

Scott
That looks pretty good IMO. Did you do a t/s param check on the driver? Perhaps actual Le is a bit higher than spec'd, which would account for the higher than expected impedance above 100 Hz or so. It also looks like the resonance frequency for your horn came in just slightly lower than the sim, which isn't necessarily a bad thing .
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Old 3rd December 2012, 12:48 AM   #23
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That looks pretty good IMO. Did you do a t/s param check on the driver? Perhaps actual Le is a bit higher than spec'd, which would account for the higher than expected impedance above 100 Hz or so. It also looks like the resonance frequency for your horn came in just slightly lower than the sim, which isn't necessarily a bad thing .
No I didn't do a T/S check, I was just too impatient. I'm very happy with the agreement, closer than many I've seen. Though I did check and re-check dimensions in the model and in building it a bunch of times.

Scott
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Old 7th January 2013, 01:54 PM   #24
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What are the outside dimensions of the cabinet?
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Old 7th January 2013, 04:21 PM   #25
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I just reread thru the post...Congratulations on the girls!!!!! They sure change things...
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Old 7th January 2013, 09:59 PM   #26
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SpeakerScott: what plate amp did u use?, good match?

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Old 8th January 2013, 02:51 AM   #27
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What are the outside dimensions of the cabinet?
27" Tall, 23.75" Deep, 14.875" wide.

Or

68.58 cm * 60.325 *37.7825
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Old 8th January 2013, 02:52 AM   #28
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I just reread thru the post...Congratulations on the girls!!!!! They sure change things...

You're telling me! Yikes. My house has exploded in pink and perfume.
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Old 8th January 2013, 02:53 AM   #29
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SpeakerScott: what plate amp did u use?, good match?

gychang
I use a BASH500 from Parts Express. I didn't build it into the cabinet though...its in a separate enclosure. I find amplifier matching to be an awkward term. It's enough power, sounds great and has the features I need. So, yes? It's a good match?


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Old 8th January 2013, 12:25 PM   #30
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Scott,

Do you happen to have a list of the sizes of the pieces illustrated in your cutlist layout diagrams.

The illustrations you provided are great, but unless I make a full size layout with pieces positioned as in your "relative position" illustration, there is no way for me to know (as an example) the size of the piece labeled as "9"

Thanks in advance... Joe L.
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