Lilmike's Picowrecker - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 217 Old 08-22-2014, 09:39 AM - Thread Starter
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Lilmike's Picowrecker

Hey everyone! A few months ago I began the hunt for a sub design that would have solid output under 30 Hz, output up to 120 dB and not cost too much. I spoke with Mike and he was kind enough to share a design that he had almost finished. The result is the Picowrecker! A seven cubic foot tapped horn that uses an Alpine SWS-10 to achieve the above goals. I went into this build with almost no carpentry skills and so far it has been quite easy with little hiccups. I will hopefully have these finished within a week as I'm going to be providing sound for a party up a mountain next Friday. I'm planning on putting each Pico onto one side of a Peavey IPR-3000 DSP. The "workshop" I've been working in is pretty messy so please excuse that.
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Last edited by McFinkle; 08-22-2014 at 09:56 AM.
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post #2 of 217 Old 08-22-2014, 04:41 PM
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Quote:
Originally Posted by McFinkle View Post
Hey everyone! A few months ago I began the hunt for a sub design that would have solid output under 30 Hz, output up to 120 dB and not cost too much. I spoke with Mike and he was kind enough to share a design that he had almost finished. The result is the Picowrecker! A seven cubic foot tapped horn that uses an Alpine SWS-10 to achieve the above goals. I went into this build with almost no carpentry skills and so far it has been quite easy with little hiccups. I will hopefully have these finished within a week as I'm going to be providing sound for a party up a mountain next Friday. I'm planning on putting each Pico onto one side of a Peavey IPR-3000 DSP. The "workshop" I've been working in is pretty messy so please excuse that.
very cool! hurry and finish let us know how it sounds. looks like a maze
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post #3 of 217 Old 08-22-2014, 07:32 PM
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Now those look awesome. Can't wait to see how they turn out.

Mike's knowledge on tapped horns is impressive so I'm sure this model will be incredible.

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post #4 of 217 Old 08-22-2014, 09:56 PM
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Figured I'd better chime in early so I can add plans, Hornresp screenies, recommended drivers and all that.

As I'm way past armpit deep in my home rebuild, I really don't have the time to maintain a build thread on this one. Like several other projects I have currently - there are drivers, plans and sheet stock on hand, but I have not had the time I need to make one to measure yet. Several beta builds were very positive, so I decided to share the plans.

McFinkle offered to do a build thread, which is awesome. My free time is so scarce right now (If I had lights over at my place, I'd still be working, I have a to-do list a mile long), I can't spend the time on the forums like I used to.

Back to the PicoWrecker....

Designed to be a bit of a step up from my T-6, in that it should achieve the 120 dB/1M measurement and a low corner in the 20s (the fundamentals that I consider to be the hallmark of a "wrecker").

It is a bit larger than the T-6, and it no longer cuts out of a single sheet. I recommend good 3/4" ply, and I recommend bracing, as per the plans.

Suggested drivers:
Alpine Type S 10 (dual 2) (dual 4)
Sundown Ev2 10 (either impedance)

1W into a Sundown, 1m groundplane:


600 watts into the same:


Excursion at 600 watts:


With a 4th order, 20 Hz highpass


And - the Alpine at a watt:


With the Sundown or Alpine drivers, I wouldn't hesitate to feed a 4-ohm cabinet all my iNuke 3000 can deliver in stereo once I had a highpass in place.

I've got to stress the fact that this design is still a BETA. I have yet to see accurate SPL and impedance measurements for any of the builds, but the feedback I have received is good. Things may change when I do. I'll do my best to keep the current plan package attached to this post. I haven't got assembly instructions or anything like that done yet.

Plans, cutsheets, and such will be attached when I have the time to put it into a presentable package. Other than the throat, which is a bit complicated, this is a relatively easy build. The external dimensions are 45" tall, 22.5" wide and 13.25" deep.

Here is a download link to the current plan set.

PicoWrecker Plans

Edit 8-25: Added driver links for clarity

Edit 9-4: Added link to current plan set, tried to attach them to this post directly, but they're too big (seriously???).

Edit 4-1: Fixed cutlist in 6d

Last edited by lilmike; 04-01-2015 at 09:59 AM. Reason: Attached plans
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post #5 of 217 Old 08-23-2014, 07:21 AM
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Would substituting a Sundown SA10 work? I've had two of them sitting in boxes since 2012 and can't figure out what to do with them.
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post #6 of 217 Old 08-23-2014, 10:11 AM
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The SA 10 looks like it has a bit too much motor and too tight of a suspension to work well in this cabinet, the response has about 10 dB of variation predicted.

I've not experimented with drivers like this though, it may be that the simulation exaggerates the peaks.
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post #7 of 217 Old 08-25-2014, 09:01 AM
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Interesting. Having trouble sourcing this localy. Is it this driver?
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post #8 of 217 Old 08-25-2014, 10:51 AM
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Quote:
Originally Posted by teddytusen View Post
Interesting. Having trouble sourcing this localy. Is it this driver?
Nope, that is an older generation. Might work, might not, without accurate specs I have no idea.
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post #9 of 217 Old 08-25-2014, 01:01 PM
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Ok. The new version seems to be unobtainium here in Norway. Most other series are available. Going to build two Insubnia for another project while I wait/search.
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post #10 of 217 Old 08-30-2014, 03:26 PM - Thread Starter
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Hey everyone! So I finished the four Pico's up yesterday just in time for the party. They still need to be sanded and painted. They sounded great! Deep, smooth, and very loud! I'll snap some pics of them tomorrow at some point. Cheers
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post #11 of 217 Old 09-02-2014, 09:08 PM - Thread Starter
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Sanding almost done, now for paint! These 4 absolutely pounded, very happy with the end result. Thanks again Mike for the design!
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post #12 of 217 Old 09-04-2014, 10:32 AM
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Version 6b of the plans is linked in my main post. I can't attach them because the .zip file is too large (but it is TINY compared to some of the others I've attached in the past).

This is the current plan set as of September 2014, and is what has been built by everyone so far.

As with all my plans, these are provided as is, under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0) License. No commercial use of this design (or any derivatives thereof) is authorized.
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post #13 of 217 Old 12-31-2014, 09:35 PM
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So, things change...but ever so slightly.

V6d of the plans has been linked in my first post.

Build got significantly easier, with very little given up. Feedback has been good.

This is the current plan set as of January 2015.

As with all my plans, these are provided as is, under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0) License. No commercial use of this design (or any derivatives thereof) is authorized.

Cutlist for 6d has been corrected and uploaded.

Last edited by lilmike; 04-01-2015 at 10:01 AM. Reason: Fixed cutlist note
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post #14 of 217 Old 01-01-2015, 12:36 AM
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Thanks for the update. Any chance you would be willing to post the HornResp inputs so we could model other drivers?
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post #15 of 217 Old 01-01-2015, 10:31 PM
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Here's the HornResp export.
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post #16 of 217 Old 01-01-2015, 11:33 PM
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Here's the HornResp export.
Thank you very much! For both this and everything else you have contributed to the community!!
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post #17 of 217 Old 03-30-2015, 01:16 PM
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I just completed rev D of this build with a Sundown E-10v2 D2. Loving this sub. I have some very preliminary measurements, but they are a bit too close to the house and I don't know what the power levels are yet. I used the 7 ply "cabinet grade" pine that Home Depot is selling for about $35/sheet. I'm happy with the material, but the face plys are very thin. No matter, I'll be Duratexin' this thing.

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Please excuse the mess, I don't have a proper shop to work in. A track saw made the cuts very easy. I would highly recommend one or another guide system, such as the EZSMART.

I'm using one channel of a QSC MX 1500a at a 4 ohm load and this sub laughs at my "wimpy" amp choice. I picked this up for $50 on Craigslist because channel 1 is bad. I might get around to trying to fix it in the future. I don't currently have a highpass, but even "Edge Of Tomorrow" at reference levels didn't push the sub to the "bad noises" point. Sundown definitely makes some impressive drivers.

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Here is the provisional frequency response, taken way too close to the house (about 15 feet) with my Dayton EMM-6.

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I will be doing a better capture with REW when the ground dries out a bit. My house backs up to an old golf course that is no longer in business, so I have a fairway with plenty of open space to get a better groundplane test.

Thanks Mike for all you have given to the DIY community!
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Last edited by bryan.lynch; 03-30-2015 at 02:19 PM.
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post #18 of 217 Old 03-30-2015, 01:46 PM
 
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That actually looks pretty flat in most of the places it matters. 30hz-70hz is the meat of the bass band ... Looking good.
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post #19 of 217 Old 03-31-2015, 10:47 PM
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Here is a close mike measurement with the EMM-6 pointing right into the throat of the enclosure. The 85 Hz null is much smaller.

I'm really going to drag this thing out onto the fairway behind my house if the rain ever stops.
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post #20 of 217 Old 03-31-2015, 11:36 PM
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Thanks for all the pics bryan.lynch!

I really need to get going on my PicoWrecker. I've got the Alpine SWS-10D2 sitting next to me just waiting to rock.
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post #21 of 217 Old 04-01-2015, 09:35 AM
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Note to all - I might have messed up the cutlist on the V6d package.

I'll check this and verify as soon as I have the time to do so.

By the way, here's the nearfield (red) compared to the model (green). Not too shabby.

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post #22 of 217 Old 04-01-2015, 09:45 AM
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Mike, I think it was the front panel. It was 3/4" short.

Nothing that butting up with a piece of scrap and PL couldn't fix. Yes, I am that lazy.
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post #23 of 217 Old 04-01-2015, 10:02 AM
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Yup.

Measured from the wrong point.

All updated.
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post #24 of 217 Old 05-12-2015, 02:20 PM
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bump. because it is being discussed in another thread. :-)


nice design mike, and nice work mcfinkle and bryan.
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post #25 of 217 Old 08-19-2015, 09:45 AM
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Would an inuke 1000dsp running stereo at 2ohms be a good match for a pair of these with the Alpine D4s?
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post #26 of 217 Old 08-19-2015, 01:41 PM
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Quote:
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Would an inuke 1000dsp running stereo at 2ohms be a good match for a pair of these with the Alpine D4s?
I'd go for the iNuke3000DSP and run it at 4 ohms per channel with the D2 subs if you haven't already bought them. You can always limit the output voltage if you are worried about pushing things too far.
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post #27 of 217 Old 08-20-2015, 08:35 PM
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Hello


I may be interested in building this box but I have a question or 2. What size room is this suited too since I have to decide whether I will need 1 or 2 of these. Also , since I have never listened to a sub like this , is its design more for extreme low end or is there good punch in the upper bass region where its hits you in the chest. I am currently running 2 sdx 10s with passive radiators in a 14 x18 room and I want to take it up a notch. If this is not what I am seeking perhaps some suggestions could be made for say some 15's or 18's with Dayton drivers.


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post #28 of 217 Old 09-09-2015, 07:48 PM
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Ordered two Alpine D2's today. Building two of these. My basement is useless below 25hz so these should do the trick. I'll be sure to get some good pics and measurements.

They might even get paired up with my THT if I can't sell it. Not sure how they'll blend together.

Last edited by Samps; 09-10-2015 at 09:22 AM.
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post #29 of 217 Old 09-10-2015, 05:17 AM
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Quote:
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Ordered two Alpine D2's today. Building two of these biitches. My basement is useless below 25hz so these should do the trick. I'll be sure to get some good pics and measurements.

They might even get paired up with my THT if I can't sell it. Not sure how they'll blend together.
Let us know how it turns out. I really love mine!
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post #30 of 217 Old 09-14-2015, 10:26 PM
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I started on my picowrecker build last night and got some more work done on it tonight. So far the hardest part has been keeping the auraco ply straight. Enjoy some pics.
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