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Ever think of building a Cornu Spiral horn? Now you can!
Ever think of building a Cornu Spiral horn? Now you can!
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Old 13th November 2018, 09:30 PM   #2561
Lingwendil is offline Lingwendil  United States
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Ever think of building a Cornu Spiral horn? Now you can!
For anybody interested, it looks like Home Depot sells 1/4" plywood with some nice veneer for a pretty reasonable price (online only, ship to home) and will custom cut it for you. The reviews seem fairly positive, and they apparently are cut nicely. Red oak is $6 each, not too bad. I've been thinking of buying four of the 1/4"x24"x24" in Cedar, not too bad of a price at $8.25 a sheet, for $43.21 shipped (in my case, with tax to my area), may be a good option for some who aren't able/equipped to cut the wood themselves.

Still not too pricy, once considered. Figure a $10~$20 driver (TC9FD, FE85, 3FE25, etc) per side you're still at $60~85 a pair when using foamcore for the channels.

https://www.homedepot.com/p/Columbia...2809/204771228


Only issue here is that one can't pick out what they want, but there's also some fun to be had figuring out how to use stuff as it comes, if you're into that sort of thing
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Last edited by Lingwendil; 13th November 2018 at 09:49 PM.
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Old 14th November 2018, 12:07 AM   #2562
xrk971 is offline xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
That's nice stuff. Thanks for the tip.

The other thing I have noticed are hardwood faced engineered floorboards. They can be had in 5in widths perfect for 3.5in driver baffles. Cheap (free) if you can get excess cut-offs or samples. They are also interlocking so two could be glued for a 10in baffle.

There are even all vinyl synthetic wood floors with cork backing. They are very dense and probably make a great baffle.
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Old 29th January 2019, 06:10 AM   #2563
bonjonno is offline bonjonno  United States
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It's about time I started building again. The 16" cornus built a while ago for my TV are so impressive I'd like to go BIG. Do you think these new Dayton drivers would be good candidates and if so can anyone recommend box dimensions? Dayton Audio DS115-8 4" Thanks.
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Old 29th January 2019, 11:41 AM   #2564
xrk971 is offline xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
That should fit a standard 28in x 5in deep Cornu. Note that it’s not a full range driver so may need a tweeter (super tweeter) above 8kHz. Try a small flat Nd dome with a simple circa 1uF to 4.7uF cap in parallel to main driver. Maybe add resistors to attenuate tweeter to level match. Sort of like the XKiClops. Or a small a AMT may work very nicely too.

Dayton Audio AMT Mini-8 Air Motion Transformer Tweeter 8 Ohm
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Last edited by xrk971; 29th January 2019 at 11:46 AM.
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Old 29th January 2019, 03:54 PM   #2565
bonjonno is offline bonjonno  United States
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Thanks xrk971! Good to be back and see ur posts. I'm not married to this driver; is there a proven good one for this same size box ~28X5? I tried to read thru this thread again, but 250 pages- I fell asleeo a few times I'm 66 and don't hear too high on the freq scale anymore, maybe 13Khz is where I max out.
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Old 29th January 2019, 10:53 PM   #2566
bonjonno is offline bonjonno  United States
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This driver also caught my eye- it's cheap too. Dayton PC105

Product Specifications
Nominal Diameter4"Power Handling (RMS)40 Watts
Power Handling (max)80 WattsImpedance4 ohms
Frequency Response80 to 15,000 HzSensitivity90.3 dB 2.83V/1m
Voice Coil Diameter1"
Thiele-Small Parameters
Resonant Frequency (Fs)81.4 HzDC Resistance (Re)3.3 ohms
Voice Coil Inductance (Le)0.32 mHMechanical Q (Qms)2.17
Electromagnetic Q (Qes)0.67Total Q (Qts)0.51
Compliance Equivalent Volume (Vas)0.13 ft.³Mechanical Compliance of Suspension (Cms)0.92 mm/N
BL Product (BL)3.3 TmDiaphragm Mass Inc. Airload (Mms)4.2g
Maximum Linear Excursion (Xmax)2 mmSurface Area of Cone (Sd)52.8 cm²
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Old 10th February 2019, 01:23 PM   #2567
SDJKQS is offline SDJKQS  India
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Friends,

I did an experiment.
I just mixed this full range Cornu board with high class Fountek rd 1.0 Ribbon Tweeter.
Now again i added Denon Sub-Woofer, for Lowest Frequencies to add depth.
To add, some more spices, i used MiniDSP 2X4 Board with Active DSP, to leverage full benefits of Parametric EQ and Leveler to match Speakers crossover (48DB/Oct separation), and you all will be surprised with that.
I uploaded video on you tube, link is YouTube

I recorded audio-video in 24-Bit audio format but editing and uploading into Youtube, just messed up with original quality. Although quality is somehow manageable.

I need carl & xrk971 review, as this thread is only because of their most of contribution.

YouTube


This costing a lot (around 400$ + more)
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Old 11th February 2019, 12:28 AM   #2568
xrk971 is offline xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
SDJ,
That sounds great actually. Nice work! Can you tell us more about the driver and the size of your Cornu?
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Old 11th February 2019, 08:58 AM   #2569
SDJKQS is offline SDJKQS  India
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Default CIRCLE

I used full range audio labs 4" dual cone speaker as mid range.
Fountek rd 1.0 super tweeter has been used at 3500hz cutoff frequency with 48db/octave filter.
Denon sub woofer being used below 200 to 75 hz.

ACTIVE DSP IS BEING USED.
Crossover function is used through MINIDSP.
Input signal is fed through creative sound card.
Original Recording was made through 24bit recorder, but YouTube and I movie editor ruined it.

Parametric EQ was also implemented through MINIDSP.
80+80 watt rms class-d amplifier was used (TDA7498).
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Old 11th February 2019, 09:05 AM   #2570
xrk971 is offline xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Hi SDJ,
I listened again with my nice headphones (OB-1) and a SE Class A headphone amp and the sound is very good - excellent actually. Nice bass and surprising depth from a 4in driver and a Cornu. You did not mention the dimensions of the Cornu you used, or standard 28in x 5.5in deep?

I could barely make out the ribbon tweeter at the top as it is partially cropped. Anyhow, nice work. I may have to revisit the Cornu again and add maybe a small AMT or a B&G on top.

Thanks for sharing.

Ever think of building a Cornu Spiral horn? Now you can!-cornu-ribbon-dsp-jpg
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