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Project: the best PA tops using commonly available components
Project: the best PA tops using commonly available components
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Old 26th February 2017, 02:48 AM   #51
djtimmy77 is offline djtimmy77
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Join Date: Aug 2015
Chris, thanks for the additional input. Increasing the input voltage produced the plots I was expecting to see....a smaller bump above the tuning frequency.

I think I am going to shoot for an enclosure with internal dimensions of 15 X 20 X 12 with tuning of 40Hz. 3" port should be enough to keep any chuffing at bay. There is a slight falling response down to 40. I am thinking keeping the phase change well below the xover frequency when using it with the sub is a good thing. Also I think I'll likely use them more frequently without the sub but that remains to be seen. Also, I think the SPL with this configuration is acceptable, so I don't think I am going to go after dual tuning.

I would be cutting the wood this weekend however I have houseguests....so if there are other things I need to consider that would push the tuning freq up let me know.
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Old 28th February 2017, 05:23 PM   #52
djtimmy77 is offline djtimmy77
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I have cut l the panels along with the holes for the speakers and port on the front face. I will be assembling them this week. Should be able to do some testing with them soon!
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Old 13th March 2017, 06:25 PM   #53
djtimmy77 is offline djtimmy77
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The sub is basically done along with one of the tops. Have briefly played around with it in the garage. Sounds decent together but need more time for a proper assessment. Can't crank it much as I don't want to annoy my neighbors.
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Old 15th March 2017, 06:25 PM   #54
djtimmy77 is offline djtimmy77
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The second top was assembled last night. Just a few minor cosmetic tweaks left.
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Old 26th March 2017, 11:36 AM   #55
djtimmy77 is offline djtimmy77
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Was borderline unhappy with the Dayton PA310-8 there was a few resonances that just made it sound off. I figured it might be the enclosure so I got some acoustical foam panels from amazon and lined the inside of the enclosure. Much happier with the sound. I do have to add quite a bit of boost to the low end to use the speakers without the sub. Also I resigned myself to using the ugly waffle grilles as they are off the shelf and inexpensive.
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Last edited by djtimmy77; 26th March 2017 at 11:52 AM.
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Old 24th December 2017, 10:04 PM   #56
Soldermizer is offline Soldermizer  United States
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Default (Almost) zero-cost tweaks...

I'm a fan of two tweaks one can do to a horn or waveguide that * may * improve its performance:

1. the "towel trick" = a lip at the mouth of the horn intended to break up the reflections that can cause "horn honk" or other bad sound.

2. the Geddes foam plug: either the "recommended" 30 PPI reticulated foam (expensive) or my "ghetto" version -- polyfill or similar batting . This is supposed to reduce "higher order modes."

Many claim either or both these tweaks can dramatically improve a horn's sound -- at a cost of slight HF reduction. Unless you need to melt the ear wax in your listeners' ears, you should be able add a little HF boost to compensate.

Other than appearance issues, may I point out both these tweaks cost almost nothing to try?
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Old 1st March 2018, 03:43 PM   #57
nikmartin is offline nikmartin
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Join Date: Dec 2012
Location: Alabama
Default UPDATE: New Components

OK, after going through all the threads, the design requirements changed. Instead of super narrow and trying to array the speaker, I've switched to a 100x40 horn, and will stack them with horns together if more volume is needed. Seems much more sane. Also, eliminated the internal crossovers and went biamped. I now just need to figure out the power requirements to buy some amps. Will probably use the iNuke 1000 + iNuke 3000, or iNuke 3000 + iNuke 6000, coupled with a Behringer DCX2496 crossover.

Here is the new parts list. I have also updated the original post. It now comes in just over $200/cabinet! Excited to build these.

Code:
Part #    Description                                                   Price   Quan  Ext
295-032   Dayton Audio PA310-8 12" Pro Woofer                           $66.75  1     $66.75
270-406   Dayton Audio DT250P-8 1" Polyimide Compression Horn Driver    $42.95  1     $42.95
245-324   PA Knock-Down Trapezoid Plywood Speaker Cabinet               $69.00  1     $69.00
294-2912  PRV Audio WG23-25 1" 100 x 40 Waveguide                       $5.99   1     $5.99
262-348   Penn-Elcom M1504 ABS Dish Two Neutrik D or NL4MP              $1.30   1     $1.30
262-824   Parts Express Plastic Pocket Speaker Cabinet Handle 4-Sided   $3.97   2     $7.94
092-052   Neutrik NL4MP Speakon Connector 4 Pole Panel Mount            $2.25   2     $4.50
260-773   Penn-Elcom F1633 Rubber Cabinet Foot 1.125" Dia. x 0.5" H     $0.46   4     $1.84
245-013   Penn-Elcom M1551 Steel Speaker Mounting Top Hat               $7.19   1     $7.19          

Total: $207.46

Last edited by nikmartin; 1st March 2018 at 03:44 PM. Reason: typo
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Old 1st March 2018, 04:39 PM   #58
jarvissound is offline jarvissound  United States
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Quote:
Originally Posted by nikmartin View Post
OK, after going through all the threads, the design requirements changed. Instead of super narrow and trying to array the speaker, I've switched to a 100x40 horn, and will stack them with horns together if more volume is needed. Seems much more sane. Also, eliminated the internal crossovers and went biamped. I now just need to figure out the power requirements to buy some amps. Will probably use the iNuke 1000 + iNuke 3000, or iNuke 3000 + iNuke 6000, coupled with a Behringer DCX2496 crossover.

Here is the new parts list. I have also updated the original post. It now comes in just over $200/cabinet! Excited to build these.

Code:
Part #    Description                                                   Price   Quan  Ext
295-032   Dayton Audio PA310-8 12" Pro Woofer                           $66.75  1     $66.75
270-406   Dayton Audio DT250P-8 1" Polyimide Compression Horn Driver    $42.95  1     $42.95
245-324   PA Knock-Down Trapezoid Plywood Speaker Cabinet               $69.00  1     $69.00
294-2912  PRV Audio WG23-25 1" 100 x 40 Waveguide                       $5.99   1     $5.99
262-348   Penn-Elcom M1504 ABS Dish Two Neutrik D or NL4MP              $1.30   1     $1.30
262-824   Parts Express Plastic Pocket Speaker Cabinet Handle 4-Sided   $3.97   2     $7.94
092-052   Neutrik NL4MP Speakon Connector 4 Pole Panel Mount            $2.25   2     $4.50
260-773   Penn-Elcom F1633 Rubber Cabinet Foot 1.125" Dia. x 0.5" H     $0.46   4     $1.84
245-013   Penn-Elcom M1551 Steel Speaker Mounting Top Hat               $7.19   1     $7.19          

Total: $207.46
That all sounds pretty good....I'd consider the Eminence H290 waveguide as it is cheapish and very similar to Wayne Parhams H290C, which is the best sounding low cost waveguide I've heard by quite a margin. I've also become a fan of the PRV D290py....Noticeably better than the Dayton and can be crossed lower. If you can get closer to 1k you're not going to have as much blooming through the crossover. I use them at 1k 24LR with SEOS or Wayne's horn and they sound very good. iNuke 3000 and 1000 should be fine. Check out the DSP models and you won't need the DCX2496.
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Old 1st March 2018, 05:13 PM   #59
nikmartin is offline nikmartin
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Join Date: Dec 2012
Location: Alabama
Quote:
Originally Posted by jarvissound View Post
Check out the DSP models and you won't need the DCX2496.
Thanks for the info! I already have the dcx2496 for my PAL12 sub duty, so I figured I'd just change it to a 3-way config.
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Old 3rd March 2018, 05:41 PM   #60
nikmartin is offline nikmartin
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Join Date: Dec 2012
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Default On the way...

Ok, this is on the way, will be here Monday. I'm just building one for testing, then will build 3 more if I'm happy

Code:
Product Name                                                            Sku       Qty Price   Total
Parts Express Plastic Pocket Speaker Cabinet Handle 4-Sided             262-824   2   $3.97   $7.94
Penn-Elcom M1504 ABS Dish Two Neutrik D or NL4MP                        262-348   1   $1.30   $1.30
Penn-Elcom F1633 Rubber Cabinet Foot 1.125" Dia. x 0.5" H               260-773   4   $0.46   $1.84
Penn-Elcom M1551 Steel Speaker Mounting Top Hat for 1-3/8" Tripod Stand 245-013   1   $7.19   $7.19
Dayton Audio PA310-8 12" Pro Woofer                                     295-032   1   $66.75  $66.75
Neutrik NL4MP Speakon Connector 4 Pole Panel Mount                      092-052   2   $2.25   $4.50
PA Knock-Down Trapezoid Plywood Speaker Cabinet for 12" Driver          245-324   1   $69.00  $69.00
Dayton Audio DT250P-8 1" Polyimide Compression Horn Driver              270-406   1   $42.95  $42.95
PRV Audio WG23-25 1" 100 x 40 Waveguide 1-3/8"-18 TPI                   294-2912  1   $5.99   $5.99
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