Seos 24, 135Hz Midbass Horn and Quad PA460 18" - Page 3 - AVS Forum | Home Theater Discussions And Reviews
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post #61 of 79 Old 07-31-2017, 06:12 PM - Thread Starter
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Originally Posted by BassThatHz View Post
Probably room modes... The optimal location for subwoofers is rarely where the fronts need to be.


What specifically, the sub bass level? Everything s measuring more or less how it modeled, I'm playing with settings and am getting a much more even match, I'll post more info tonight.
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post #62 of 79 Old 07-31-2017, 08:26 PM - Thread Starter
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I did some more XO tweaking and they are sounding very good, I also was able to bring the bass up to the level of the midbass horn.this is a blended sweep gated to 5ms



Close up on the bass FR, comparison with both ports open and one plugged, actually quite close to the models if you consider room resonances





I demoed them for some friends last night, Tricycle Film and the BB's track 1 almost resulted in a few cardiac arrests with the incredible dynamic range of that album =)

Javad
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post #63 of 79 Old 08-01-2017, 01:14 AM
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Seos 24, 135Hz Midbass Horn and Quad PA460 18"

Wow that's amazing, good job on these, how many listening rooms do you have? You have your red towers, strafis and now these lol.


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post #64 of 79 Old 08-01-2017, 10:48 PM - Thread Starter
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Originally Posted by Trimlock View Post
Wow that's amazing, good job on these, how many listening rooms do you have? You have your red towers, strafis and now these lol.


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Thanks! I have taken over the dining room from the wife and she's been pretty cool with it. I've got a lot of speakers still, I sold the 812's to a friend that had to have them as well as the Microfarads, the Baronette towers, Fatboys and a few more, I'll be building a subwoofer to go with the Strafi soon as well =)
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post #65 of 79 Old 08-02-2017, 09:04 AM
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Nice looking cabs, some techflex would dress up the white wires nicely


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post #66 of 79 Old 08-02-2017, 09:06 AM - Thread Starter
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Seos 24, 135Hz Midbass Horn and Quad PA460 18"

Quote:
Nice looking cabs, some techflex would dress up the white wires nicely

Thanks! The wires are just temporary, I'm working on some twisted pair speaker wires to go with them, will post them soon.
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post #67 of 79 Old 08-05-2017, 03:24 PM - Thread Starter
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One last touch on these, I wanted to do some nice speaker wires that always stay with this set.

I started with 6 strands of 18g cooper wire. We were all out of unicorn dust silver wire at 034Motorsport so this had to do.



I twisted the 3 wires together as positives and negatives then twisted those together. The fun part was passing all that through some 1/2" clear shrink tuning, I should have used 3/4" but I wanted it to be tight.

Some ends have banana plugs and others have spade connections.

These are the main wires that go to the sub XO input



I cleared over the bodies to insulate them









Then the wires out of the XO into each sub and up to the midbass XO





And installed







Horn L pad finalized, this configuration allows quick and easy swapping out of resistors to adjust the L pad w/o any soldering.





Thanks!
Javad
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post #68 of 79 Old 08-12-2017, 08:34 AM - Thread Starter
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Here's a video of them playing some Diana Krall, with detail shots as well

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post #69 of 79 Old 08-12-2017, 08:53 AM - Thread Starter
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And a couple more pics







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post #70 of 79 Old 08-12-2017, 10:22 AM
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Excellent work (as are all of your projects). Thanks for sharing with as much detail and pics too. I was skeptical on how the bottoms would look. I should have known better. They look perfect. So does attaching the two woofer boxes give the same force cancelation that a single dual opposed does? I'm still amazed at the way my dual opposed um18s have no cabinet vibration as the woofers stretch in and out to Type O or Run DMC.

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post #71 of 79 Old 08-12-2017, 10:42 AM
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Its funny, I take over our dinning room as well.

"Ok sun, you get to sit on the subwoofer and daughter you get to sit on the stack of scrap."

These look great, very cool idea to keep the XO's outside so you can change them on the fly.
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post #72 of 79 Old 08-12-2017, 10:57 AM - Thread Starter
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Quote:
Originally Posted by Grott77Ralph View Post
Excellent work (as are all of your projects). Thanks for sharing with as much detail and pics too. I was skeptical on how the bottoms would look. I should have known better. They look perfect. So does attaching the two woofer boxes give the same force cancelation that a single dual opposed does? I'm still amazed at the way my dual opposed um18s have no cabinet vibration as the woofers stretch in and out to Type O or Run DMC.

Hey man thanks, glad you like them! I'm really impressed with these "bargain" woofers, I haven't gotten them out of shape even at obscene SPL levels where the house sounds like it's shaking apart. And glad you like how they look too, I ran with the "rat rod" theme, or more "nice upscale rat rod" =)

Yes they act as force cancelling, the 4 brackets tie the two enclosures rigidly together, virtually no vibrations, I'll upload a video, you can imagine the horns on top wouldn't like being bounced around, and there isn't a vibration in them even at full power.

Javad
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post #73 of 79 Old 08-13-2017, 08:34 AM
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Nice build Javad!!! Very cool speaker system, I would love to hear them.

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post #74 of 79 Old 08-13-2017, 08:58 AM - Thread Starter
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Nice build Javad!!! Very cool speaker system, I would love to hear them.


Thanks! If you're ever in the SF Bay Area let me know =)
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post #75 of 79 Old 08-20-2017, 11:25 PM - Thread Starter
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My initial goalI with this setup was to get it working nicely on a totally passive XO, and if you think about it, this is an incredibly powerful and efficient speaker system that could be run off any receiver or 100 watt amp and hit well over 110db or more. It's a very modular setup and very easy to set up and take down.

Next step was to make it fully active, which I did today. By going active I hoped to time align the horns, play with various XO slopes and flatten the frequency response.

I'm using an OpenDRC DA8 from miniDSP

If you're interested in this unit it's really nice for the $355 price, the only catch is it only has a digital coax input, which I was able to use an optical output on my Mac headphone jack and I used a simple converter to go from optical to coax.

An Adcom GFA-555II runs the 4 PA460, and a 4 channel Adcom GFA-2535 running each pair of horns.



XO slopes I've been playing with but are currently 48db between the high and midbass horns and 24db between the subs and midbasss. I ended up with 3-4 filters on each channel, quite minimal considering the flat response.

I ended up with 1.7ms of delay on the high freq horns, switching it on and off in hard pressed to hear a big difference, but it is slightly noticeable. I've played with time alignment a number of times and I'm led to believe a lot of people make a bigger deal of its importance than is reality.

All measurements are nearfield at one meter centered on the Seos24



Basic setup in minidsp



The PEQ filters on the high freq horn



Individual driver response and combined



Comparison to the passive setup, (disclaimer,I could have spent more time on the passive setup to improve the response no doubt), also note a subsonic filter at 30hz



Distortion is very low, less than 1% above 100 at 100db, less than 9% down to 20hz









Overall this configuration does sound better, it's more coherent and the flat freq response sounds better. Bass measures quite hot nearfield but is only about 3db hot in the listening position, plus I like bass .

If I haven't said this already, listening to powerful and dynamic music on these is a totally immersive experience, I find myself pausing the music to catch my breath at times, heart racing. They easily produce full spectrum response at 115db including bass, the entire house shakes and the walls rattle from the inside. Despite this the dual opposed configuration is vibration free, the horns never move a nanometer. I haven't stressed or maxed out the subs yet, with only "6mm" xmax these $95 subwoofers astound, with this much cone area bass is accurate and effortless. I really wish you could all come over and hear these =)

Thanks!
Javad
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post #76 of 79 Old 08-21-2017, 04:46 PM
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I know I am being lazy and I could google all the parts but if you know off the top of your head approximately how much do you have into these to build a pair just in parts, not enclosure material and labor?

I would love to hear those. I bet that's an experience for "just" a pair of stereo speakers

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post #77 of 79 Old 08-21-2017, 08:16 PM - Thread Starter
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I know I am being lazy and I could google all the parts but if you know off the top of your head approximately how much do you have into these to build a pair just in parts, not enclosure material and labor?



I would love to hear those. I bet that's an experience for "just" a pair of stereo speakers


No worries, about $2k in hard parts for drivers and Seos24 horns, passive XO components are about $300, active setup can vary but figure the two amps I'm running are worth about $850 on eBay, DSP is $355. So under $3500, and yes these are an experience for sure! If you're anywhere near San Jose, Ca hit me up.

Javad
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post #78 of 79 Old 08-22-2017, 03:26 AM
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No worries, about $2k in hard parts for drivers and Seos24 horns, passive XO components are about $300, active setup can vary but figure the two amps I'm running are worth about $850 on eBay, DSP is $355. So under $3500, and yes these are an experience for sure! If you're anywhere near San Jose, Ca hit me up.

Javad
Can you post a link as to where you ordered your mid horn kit? Does it come pre cut and ready for glue up? Or do you have to make the cuts that form the horn yourself? I would love to see a very detailed explanation of your mid horn build.
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post #79 of 79 Old 08-22-2017, 07:55 AM - Thread Starter
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Can you post a link as to where you ordered your mid horn kit? Does it come pre cut and ready for glue up? Or do you have to make the cuts that form the horn yourself? I would love to see a very detailed explanation of your mid horn build.

The plans are only $25 and available at http://inlowsound.weebly.com/diy-100...bass-horn.html

I did do a very detailed build earlier in this thread, if you haven't already i'd suggest starting in page 1 and going forward, I put a ton of documentation and effort in these threads for the benefit of anyone else considering doing the same thing =)

I'm happy to help if you're up for it or can even quote you to build some, let me know how I can help.

Javad
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