DIY Flat Panel Speaker Love

[Unbiasedsound]

Experimenting is the best experience as I like to walk the walk and not just talk the talk. LOL I do not discard anything that has not been tried myself from my OWN experience......Bertagni speakers are tried and true to my ears and have proven to me that it is totally possible to use more then one exciter on a single panel. With my newly discovery of the HF extension in the tectonic 13mm exciter brings me too almost 90% of duplicating Bertagnis speakers sound. I can be satisfied with 90% but why stop there baby I am going all the way, who knows I might hit 110% making them sound even better then my Bertagnis LOL.

I am going to order the tectonic 19mm TAEX19CO1-8 sometime next week to see how it compares to the 13mm tectonic.

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James, that's a very low resolution response measurement there, and with a device of questionable accuracy. I agree though based on what I'm seeing, that the material is a factor. I am assuming that we are all using the recommended location for exciter placement.

At 1/6 octave on the iphone app they still show a relatively flat frequency response. When measured from a seating position with better software and a UMM6 mic, they compare favorably with the $1000.00 Boston Acoustics RS 334s. If anything, they have a somewhat smoother response than the BAs.

[Kornbread]

jmanes, is the middle REW pic what is smoothing set to? Would you mind setting it to maybe 1/12 or 1/6. Yes, resolution is lost but it makes it easier to read.

Congrats on posting measurements, they are sooooooooo much easier to interpret than someone describing how something sounds to them.

[rmeinke]

They sure do look great jmanes!!!

[Unbiasedsound]

I was bored today , I had some left over EPS that I figured I would use and experiment with just for fun. These panels are very small at 7-1/2inchsX9-1/2inches.X1inch thick. Utilized the same concept design of my Bertagni speakers on these panels. My first impression was that these panels are so small that they wont have any bass, but low and behold I was shocked. Even these small panels utilizing Bertagnis concept can make panels as small as these have decent amounts of bass similar to some some 3-4inch cone drivers....They sound good enough to be used as my surround sound panels....I will also be ordering those cheap clearance crossovers at $2.00 each to experiment with my small panels.

[captainjack115]

Has anyone here heard about the JMC Soundboard loudspeaker?
It's supposed to be made from spruce wood, the same stuff used to make guitars. They claim a response of 25 to 20,000

http://www.jmclutherie.com/en/Soundboards

[Gary.M]

Has anyone here heard about the JMC Soundboard loudspeaker?
It's supposed to me made from spruce wood, the same stuff used to make guitars. They claim a response of 25 to 20,000
http://www.jmclutherie.com/en/Soundboards

Very pretty.

[Unbiasedsound]

Has anyone here heard about the JMC Soundboard loudspeaker?
It's supposed to me made from spruce wood, the same stuff used to make guitars. They claim a response of 25 to 20,000
http://www.jmclutherie.com/en/Soundboards

Spruce:
Very soft to the touch, it is extremely stiff for it’s overall density. Like Alder, it’s another wood with a hard skeleton and soft meat. So in a solid body, it will produce tremendous resonant, open midrange, while retaining high frequency attack, and having good low end breath. Because of the low density overall the sound wouldn’t be perceived as having less midrange than Basswood. The mids will be just as powerful and dynamic amidst the addition of clear highs and lows. Probably the most full frequency body material accepted.

Sounds like a good overall material but I think it is fairly expensive and not readily available at the local hardware stores. I seen some 2-3mm spruce wood on ebay for $10.00 but they are the very small panels , the bigger panels run $200.00 and over.

[captainjack115]

Spruce:
Very soft to the touch, it is extremely stiff for it’s overall density. Like Alder, it’s another wood with a hard skeleton and soft meat. So in a solid body, it will produce tremendous resonant, open midrange, while retaining high frequency attack, and having good low end breath. Because of the low density overall the sound wouldn’t be perceived as having less midrange than Basswood. The mids will be just as powerful and dynamic amidst the addition of clear highs and lows. Probably the most full frequency body material accepted.

Sounds like a good overall material but I think it is fairly expensive and not readily available at the local hardware stores. I seen some 2-3mm spruce wood on ebay for $10.00 but they are the very small panels , the bigger panels run $200.00 and over.

Apparently the wood needs to be quarter sawn to be usable for proper resonance characteristics.
Videos show that the panel is slightly curved and braced from behind. Doesn't it always seem to be that the best materials are expensive, carbon fiber honeycomb used by Tectonic is very expensive.

[Unbiasedsound]

Apparently the wood needs to be quarter sawn to be usable for proper resonance characteristics.
Videos show that the panel is slightly curved and braced from behind. Doesn't it always seem to be that the best materials are expensive, carbon fiber honeycomb used by Tectonic is very expensive.

There was a video on youtube where this person used the exciters on the guitar and it sounded pretty good. Not sure exactly what type of wood his guitar was made of though. https://www.youtube.com/watch?v=GRJdIv_zvag

[Unbiasedsound]

Also that JMC lutherie uses only one panel and not a pair and utilizes 8 exciters on that one panel. JMC's exciter placement is also different then the conventional placement suggested from parts express as JMC's exciters are spaced farther apart dividing them into four placements with 2 exciters close to each other. Or you could just watch this vid to know exactly what I am talking about lol>

[captainjack115]

I sifted through as many Youtube videos as I could find on JMC Lutherie.One of them is over 17 minutes long, unfortunately for me I do not understand nor speak French.
The video shows indeed eight exciters and they are separated in such a way as to be connected to two amplifers. Also noted is a framework array consisting of passive components such as would be used as a crossover network or possibly frequency contouring. I haven't found a suggested price on this Swiss made product, but I'll bet it's pretty expensive.
Also noted is that the spruce panels appear to be joined together in strips of staggered width. It appears that Jeanmichel Capt, inventor, knows a thing or two about resonace as it applies to musical instruments.

[captainjack115]

I sifted through as many Youtube videos as I could find on JMC Lutherie.One of them is over 17 minutes long, unfortunately for me I do not understand nor speak French.
The video shows indeed eight exciters and they are separated in such a way as to be connected to two amplifers. Also noted is a framework array consisting of passive components such as would be used as a crossover network or possibly frequency contouring. I haven't found a suggested price on this Swiss made product, but I'll bet it's pretty expensive.
Also noted is that the spruce panels appear to be joined together in strips of staggered width. It appears that Jeanmichel Capt, inventor, knows a thing or two about resonace as it applies to musical instruments.

Ouch!!!!!!!!!!!!!!!!!! Found the price. $6500 approximately.

[Unbiasedsound]

Ouch!!!!!!!!!!!!!!!!!! Found the price. $6500 approximately.

Damn for that price I would rather buy the Revel Performa3 F208.

[captainjack115]

Having very minimal wood experience I've looked into quarter sawed wood in general.
From what I can gather the annual rings are running parallel to each other along end cuts instead of being compressed on top of each other as in standard lumber cutting. There is a limit to the amount of prime cuts that can be made in quarter sawing, thus the higher cost.
Looking at photos, the parallel lines from the annual rings remind me of honeycomb panel construction. I can't help wondering if the orientation of the annual rings facilitate vibrational propagation from back to front, especially for higher frequencies. Surely there must be something to this, luthiers wouldn't be calling it tonewood for nothing.