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Midwest Audio Fest

It’s that time audio enthusiasts! Registration for the 2019 Speaker Design Competition is now open! Visit midwestaudiofest.com for details and to list your speaker project. We are excited to see all returning participants, and look forward to meeting some new designers this year, as well! Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans. We hope to see you this summer! Vivian and Jill
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DIY Flat Panel Speaker Love

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  • I get mine from ebay, Mr.Polystyrene. Comes in 2 sizes with various thicknesses and grades. 2ft.X16inch and 2ft.X4ft. thicknesses range from 1/2-3inch. Grades range from low to ultra high density. Best thickness is 1/2inch. Best grade is UHD.

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    • Thanks much Unb.

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      • Unb ... mrpolystyrene.co.uk got me to page that has no inputs. No luck with ebay, either. Assume is ID10T error. Will you help once more?

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        • https://www.ebay.co.uk/itm/EXPANDED-...r=500826698019

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          • Glad they have small qty's, thanks!

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            • Hi all, complete newbie here, I've got a couple of DAEX32EP-4 thrusters coming that I want to make into a pair of bookshelf style speakers, would a 12" X 12" panel be sufficient for an exciter like this?

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              • That particular exciter would be more then sufficient.....The problem with that small of a panel size is that it wont have much bass response....Panels need to be at least 16inchs minimum before any real bass frequencies can be heard and more preferable in the 2ft. size.

                The only down fall to full range DML panels is that it needs to be large enough to produce the lower end frequencies......The only other way is to use very small panels with a separate sub woofer to fill in the low end.

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                • Ahhhhh cool, thanks for that, might have to revise my plans!!

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                  • Today I want to talk about something that is neglected and over looked by most newbies/inexperienced people when choosing a panel...….One of the most important aspects of choosing the right panel is a panels "THICKNESS"...….Most people think 1inch panels are the best since its the most readily available size thickness which is not true...….Thinner panels bend more then thicker panels and this is what produces more cleaner and accurate bass response, hence the term BENDING WAVES. The waves need to bend/flex the panel material. if the panel material is to stiff it wont bend/flex the panel therefore there wont be any bass.

                    Tech ingredients first video on DML is a fine example of one that does not comprehend the concept of thinner panels under 1inch...He claims you just need bigger panels for more bass which is not true as thinner panels will produce more clean accurate and pronounced bass response....watch at 8:50 where he test each panel sound....he says the balsa has the best bass because its a bigger panel which is false...out of all the panels he used he said the aluminum panel is the worst sounding because it rings BUT if you listen to the sound it has the best BASS response out of all the other panels, WHY??? Simple its the THINNEST of all his panels as well as being one of the smallest which further prove bigger does not always equate to better bass unless you adjust the thickness accordingly.

                    https://www.youtube.com/watch?v=zdkyGDqU7xA

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                    • WTF??? I hope that was an error as it said my post was marked and flagged as spam? If so I wont be giving out advice on this subject/topic.

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                      • Has anyone tried to build a DML subwoofer with the bass shaker? https://www.parts-express.com/dayton...watts--295-244

                        Probably have to do it like a down firing subwoofer.

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                        • Originally posted by Unbiasedsound View Post
                          WTF??? I hope that was an error as it said my post was marked and flagged as spam? If so I wont be giving out advice on this subject/topic.
                          Based on some other comments in other threads, it seems if you try to edit your post twice it thinks it is Spam and basically disappears. (I don't know if you tried editing it, but that is one possibility.)

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                          • Originally posted by a4eaudio View Post

                            Based on some other comments in other threads, it seems if you try to edit your post twice it thinks it is Spam and basically disappears. (I don't know if you tried editing it, but that is one possibility.)

                            Ah I see, yea I did edit my post twice so that's probably what happened, thanks a4eaudio....At first I thought someone was flagging my post intentionally but I see my post (1179) that was deleted back up again.

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                            • Thanks for the EPS supplier link, Unbiased. I talked with a foam manufacturer who has Type IV EPS 1.8 lbs/cubic foot, which is equivalent to the 30 grams/liter for the ultra dense on the UK website. This manufacturer also makes Type XV which is 3 lbs/cubic foot. Do you think that even the higher density as that would be better still? I am going to make a hot wire cutter to make whatever thickness I need. I also asked him about aged EPS, which is used on EIFS stucco. It is aged for 6 weeks, so it can finish outgassing, to minimize shrinking. This would likely be best to do with our DML's before sealing them.

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                              • Originally posted by Zene View Post
                                Unb ... now you're talking my language moving off the beaten path. Can't wait for results and pics. My 4 way is moving slowly (very). Oddly is almost opposite; cone bass, DML upper bass, DML mid and BMR tweeter.


                                Zene, What BMR tweeter are you planning on using? Will you be running it full range or cross it over at what frequency? I am running 19 x 32" x 1 EXP 150 from 300 hz and up, with ob cone bass below 300. I want some direct sound (a little more presence) and better highs, without needing so much EQ, from another driver - thinking a BMR would blend well.Thanks.

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