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5 Lab 12 based PA tapped horn.  ~35hz extension
5 Lab 12 based PA tapped horn.  ~35hz extension
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Old 28th April 2018, 01:54 AM   #591
LORDSANSUI is offline LORDSANSUI  Brazil
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it's a nice idea, how would you seal when you set up as keystone?
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Old 28th April 2018, 05:14 AM   #592
BP1Fanatic is offline BP1Fanatic  United States
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Make the whole panel with the half circle removable.
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Old 28th April 2018, 10:03 AM   #593
aragorus is offline aragorus  Denmark
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with a removable panel
I'll build a protoype the coming weeks and do some measurements.
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Old 28th April 2018, 07:24 PM   #594
aragorus is offline aragorus  Denmark
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Keystone SC MkII - with 2 modes of operation and infinite setup possibilities

Scientific, do you have any measurements of the test you did on those?
I just ordered a pair of B&S 21SW152 and will start building a test cab sometime next week.

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Old 8th July 2018, 01:00 PM   #595
aragorus is offline aragorus  Denmark
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Hey guys!
After some time, I managed to make a pair of single Keystones SCmk3.
They house a B&C 21SW152 4ohm each. and sound pretty nice
I haven't been able to do outdoor measurements yet, but the indoor measurements looks pretty nice.

It's a pretty long horn tho... had to delay my unity horns 15ms to get them to play in phase

I'm taking them for a spin in the open later this month and will provide some data.

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Old 8th July 2018, 04:39 PM   #596
BP1Fanatic is offline BP1Fanatic  United States
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Nice! Did you leave the enclosure in pic 3 as is or was it modified to 1 of the enclosures in pic 1?
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Old 8th July 2018, 04:54 PM   #597
Osse is offline Osse  Sweden
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How are the bottom panel flexing when its that close to the driver without any bracing? (Maybe it has behind the driver tho)
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Old 9th July 2018, 07:38 AM   #598
4AC is offline 4AC  Netherlands
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5 Lab 12 based PA tapped horn.  ~35hz extension
Quote:
Originally Posted by aragorus View Post
It's a pretty long horn tho... had to delay my unity horns 15ms to get them to play in phase
FAQ | Danley Sound Labs | Danley Sound Labs, Inc.

"The Tapped Horn is not like a normal folded horn. The effective path length is not the path length of the horn. It is somewhere between the direct path from the drivers to the exit (on one side of the driver(s)) and the path all the way through the horn on the other side of the driver(s). The path length varies with frequency. How you integrate it into your system depends also on the phase response of the full range loudspeakers used-type of crossover filters and slopes used. Depending on the crossover freq and delay used, sometimes it is best to flip the polarity of the tapped horn in order to get the best response. This will need to be either measured or tested to be sure what is best. Here is a simple test to get close. Choose whatever crossover freq you want and put that frequency Ė ( use a sine wave) into the system-driving both the Tapped horn and the full range loudspeaker. Increase the delay time on the full range loudspeaker until you get a null and adjust so you get the maximum null. If you donít get a null-but rather something that sounds like a bump, try reversing the polarity and adjust again. When you have the delay time in the deepest part of the null-invert the polarity on the sub and you will be done. The lower freq the Tapped horn goes, the longer the delay time will generally be. But in the range of 3-20ms would be typical-but it could be longer or shorter depending on the particular setup."
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Old 9th July 2018, 08:20 AM   #599
aragorus is offline aragorus  Denmark
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It doesn't have a keystone style mouth as per say. I'm pretty happy with how it sounds.
There is bracing just behind the driver and I'm planing on making an extra one. The subs were walking a bit, but after I put some rubber feet it stabilised.
I'm taking them out for a spin at a friends wedding next week where I'll run them strapped to each orher as in the picture.
As to the phase, I used SMAART to phase align. I think it's easy to get confused with the sine method as you may be 1 period away since the sin wave is periodic

I'll send measurements and pictures soon
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Old 7th September 2018, 03:35 AM   #600
eusubius is offline eusubius  Canada
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Been reading threads here from XoC1 to Keystone, and finally thinking I better start a bit smaller... PAL12! I do some live sound, and of course bass is generally the biggest shoe to fill or rent.
Quick Q: Has anyone modeled any Alpine type R subs in a PAL12, especially the SWR-1222D?
Specs here: http://support.alpine-usa.com/produc..._SWR-1222D.PDF


I know they were compared to the Lab12 in another design, but I can get a used pair for a good price, and way less than having to order a Lab. I can always switch to LAB's later. Pretty excited to start building.
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