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Foam panel + exciter speakers sound .... really bad !!??

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  • Unbiasedsound
    replied
    No I dont have a build thread. If I was going to make a build thread I would have posted it in the project gallery.

    Leave a comment:


  • LOUT
    replied
    Originally posted by Unbiasedsound View Post
    I bet anyone if yawl heard my panels you will realize the potential of DML technology. I just finished building my "Tower", DML panels and they sound just as good as my small sat. panels and or better due to a new technique I have learned from designing the Towers. I am going use this technique and tweak my smaller panels to see if it will work.

    Listening to my Tower DML panels as I type and they sound phenomenal.
    Do you have a build thread you can link to?
    If not, could you make a dedicated build thread?
    I know you've answered a lot of questions in the big DML thread, but I think something more organized around your current build would be easier for others to follow along with.

    Leave a comment:


  • Unbiasedsound
    replied
    Since exciters/BMR drivers are fairly cheap some people think that there sound quality wont be as good but like I said its all design dependent. Sure if big brand name companies made high quality hi fidelity exciters they would sound even better. The exciters available now are very limited and not the highest of quality. Some of the exciters voice coil arent even aligned accurately which can effect sound. I know as I had to throw away brand spanking new exciters because they didnt sound right since quality control is not that high with some of those cheaply made exciters.

    Most people over time give up on DML's as they are either not serious about it and or dont know how to design there panels to sound good. Most just chalk exciters up to a fun novelty experiment but dont seem to realize there true potential.

    I bet anyone if yawl heard my panels you will realize the potential of DML technology. I just finished building my "Tower", DML panels and they sound just as good as my small sat. panels and or better due to a new technique I have learned from designing the Towers. I am going use this technique and tweak my smaller panels to see if it will work.

    Listening to my Tower DML panels as I type and they sound phenomenal.

    Leave a comment:


  • Unbiasedsound
    commented on 's reply
    I agree about the cloth over damping the panel...The only type of cloth that I found that can be used on the panels are actual cloth used specifically for speakers. The speaker cloth I used are the ones I bought from P.E.

    I agree also as these speakers function like Open Baffle speakers in which they need to be at least 2ft. away from any walls as they use the reflected energy.

    DML speakers placement should be close to and around ear level depending on how far back you are sitting.

    Also DML's work really great with conventional cone powered subwoofers and even better with Open baffle type of powered subs.

  • MisterD
    replied
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    I built some 2’x2’ DML panels using the pink foam, sanded then coated with thinned and dyed wood glue. My exciters were the thrusters - and they sounded quite good. It does take a while to get used to their omnidirectional output and I thought the side with exciter on it did have better highs. The speakers played loud and clear.

    Three things that I would have not done on the OP’s panels are - the cloth, which greatly dampens output - the mounting style the OP used which I think limits movement and is probably MOST important (mine hang freely from thin paracord), and mounting near a wall. The panels seem to sound best at least two feet away from any wall..

    BTW - mine were up higher than I would have liked ‘cause I wanted to hear them from anywhere in the room. I put them above couch level. They worked well and sounded good - but still didn’t make enough bass. Rather than experimenting with larger panels I switched speaker styles completely - someone gave me a pair of Peavey SP1 mkIII’s to play with.

    Leave a comment:


  • Unbiasedsound
    commented on 's reply
    Well you said they are not even medium fidelity. Which means you havent heard a good sounding medium fidelity DML panel.

  • Unbiasedsound
    commented on 's reply
    Like you stated NXT was never into high fidelity as they were more for live performances like concerts. One of the advantages for concert sound is DML panels have way less microphone feed back then conventional cone speakers.


    https://www.youtube.com/watch?v=VbNNk-9GMRo


    DML's dont have to be used as full range. It can be used as 2 ways or even 3 ways with Xovers. It can be combined with conventional cone drivers and or a subwoofer.
    Last edited by Unbiasedsound; 11-18-2021, 07:55 PM.

  • PWR RYD
    commented on 's reply
    LOL at being a failure at DML panels

  • andy19191
    replied
    Originally posted by PWR RYD View Post
    Has anyone ever seriously considered exiters and foam panels as even medium fidelity? DML's are so compromised in every way. Maybe a fun and cheap weekend experiement.
    NXT has been pretty serious about the applications of DMLs for a few decades. They have put in significant R&D in an effort to find a profitable niche but with only modest success at best. High fidelity was never an application area but they did need to build a perception that the sound quality was OK (e.g.) if they were to get traction with consumer goods like TV screens, surround speakers, mobiles or whatever.

    You can find the BMR derivative in expensive audiophile speakers like the £30k Node which I have heard and it performed well though SPL limited. Superior to the best DML I have heard but that was DIYed for less than 1% of the price. Well designed conventional speakers could provide better technical performance for £30k but that isn't really what the Node is about as a product.

    I suspect DMLs are pretty much the same as "full range" drivers, dipole speakers, etc... which a few DIY speaker folk get enthusiastic about but which possess one or two significant cons that prevent them being adopted commercially as high technical performance speakers. Playing about with this sort of thing can be fun though and I would encourage rather discourage people with an interest to have a go at seeing what they can develop.

    Leave a comment:


  • Unbiasedsound
    commented on 's reply
    I have considered my design as mid to high fidelity when compared to entry level and or older models of Magnepan. Every driver has its compromises especially one that is used as full range as DML's arent very different from conventional cone drivers. Just because you failed (and or others you know) in building a good sounding mid-hi fidelity DML panel it doesnt mean others have and or cant build a good one.

  • PWR RYD
    replied
    Has anyone ever seriously considered exiters and foam panels as even medium fidelity? DML's are so compromised in every way. Maybe a fun and cheap weekend experiement.

    Leave a comment:


  • Paul Carmody
    replied
    Originally posted by fastskiguy View Post

    hey makes perfect sense but i just don't understand why all of the youtube videos out there are raving about how awesome slapping an exciter onto a piece of styrofoam is supposed to sound. I mean....what is going on there?

    As for me...it's back to a more conventional speaker. Thanks for the comments

    joe
    one weird trick speaker companies don't want you to know!!!!!1!111!

    Leave a comment:


  • andy19191
    replied
    Originally posted by Fastskiguy View Post
    I just don't understand why all of the youtube videos out there are raving about how awesome slapping an exciter onto a piece of styrofoam is supposed to sound. I mean....what is going on there?
    Presumably they want you to view their videos to help with their online status and financial income. Exaggerated claims about the performance of cheap or free stuff is an effective and common tactic.

    Leave a comment:


  • Unbiasedsound
    commented on 's reply
    Like I said before a DML's sound quality is based mostly on ones design, the better the design the better the sound. Dont let that beginners intro design discourage you from building a better design. If you actually hear a good DML design in person you will understand what the fuss is all about.

    The easier route is to use a BMR driver and combine them with conventional cone drivers, like the Philharmonic BMR towers and or bookshelves.

    https://www.audioholics.com/tower-sp...ilharmonic-bmr

  • Unbiasedsound
    commented on 's reply
    Those commercially made speakers are examples of a DML's potential.
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