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Old 9th May 2010, 04:46 AM   #301
mavric is offline mavric  United States
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Default SPL for fun

love the smell of voice coils in the night.
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File Type: jpg P5090426.jpg (515.8 KB, 233 views)
File Type: jpg P5090427.jpg (500.9 KB, 219 views)
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Old 11th May 2010, 10:34 PM   #302
mavric is offline mavric  United States
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on post #297, that was pink noise with the mic about three feet away mid level high on a stand, i was very impressed when i compared it to my traditional round speakers which sound awful to me now, it like going from driving a VW beetle( old one) to a Viper, there is no substitute period.
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Old 16th May 2010, 05:02 PM   #303
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Default RTA update

sorry i have not posted sooner, back injury. either way, Here are the other pics, I have not figured out how to describe each pic, but will have a number,
All measurements are done about 9' or 108cm. with the mic on a camera podeum.
> 5090422
pink noise with the meter set at 80-100db, callibration a litttle high to show cross-over points, very impressive, flat from 25hz thru 25k, nice drops at 24 db slope, the curves merge perfect.
>5100432
brown noise, not very familier but tested any way, Ger sent this to mw as well the pink noise, to have or rather post how flat the hybrid planer works. Obviously, most people choose pink noise for testing, thats what i suggest.
>5100433
this one is awesome, it blew me away, this is a test tone @ 18hz from a CD, this what i picked up at 9" or 130cm away, only from one. the entire house was shaking, dishes in the kitchen going crazy, the woofer was going nuts, but no distortion, i went on testing the tl, but will have to post more pics, as it was getting late and i do have neighbors.

The first pic was something i have almost never seen in my line of work, a flat responce is allmost impossable using tradtional round speakers for the entitre frequency range. I think i posted a pic of that as well. I will post it again here, save some time,
same tone same distance.
>5090423
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File Type: jpg P5100432.jpg (446.7 KB, 143 views)
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File Type: jpg P5090423.jpg (353.2 KB, 15 views)
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Old 18th May 2010, 01:49 AM   #304
mavric is offline mavric  United States
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Quote:
Originally Posted by bolserst View Post
Hi Mavric,

You might try measuring just the ESL by itself, no woofer. Then measure the woofer by itself, no ESL. This should give you a clue if the dip around 630 is just the dipole roll off of the ESL, or an interaction between the woofer and ESL.

I'm not sure how you have your crossovers set up, but you might find that if you swap the phase of the woofer, the dip at 630 may fill in.
I will follow up this week end with that specfic test, thanks for the heads up.
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Old 18th May 2010, 02:01 PM   #305
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Hi Mavric,

Thanks for taking us along on your excellent build. Someday, I'll build my own pair based on what you and Charlie have most generously shown us.

Any chance you can share a graph from RTA? Also, tough question to ask, but is your current room big enough for your speakers?

Thanks again,

Craigj
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Old 18th May 2010, 11:12 PM   #306
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Sorry my friend, i do not have it plugged into the printer, and yes, these are a bit large for my living area. The panels and subs are 20 feet away from the sweet spot, honestly, it was a little over done, but there are times when you want rock. I like rock, i guess in my eyes and ears, its perfect, i can allways turn them down, rather than having too small and trying to get louder. I am sure Ger would dissagree on this, as his are loud as heck, but the dispersion on these panels rival smaller at low volume, as i am still learning here.
I have had a few people interested in this meter, any suggestions on testing? i have only used it for spl, first time using the rta mike. suggestions are welcome.
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Old 18th May 2010, 11:45 PM   #307
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Quote:
Originally Posted by mavric View Post
, i can allways turn them down, rather than having too small and trying to get louder
Roger Sanders' Cookbook states that you actually need more amp power to drive a smaller speaker to a given SPL than you would need to drive a larger panel to the same SPL.
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Old 19th May 2010, 01:06 AM   #308
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Yes this is correct.There is no substitution for surface area.
I have learned to compensate this by using a higher transformation ratio,but not without compromising issues of course
But as for my little panels,they are quite efficiant and very loud for the desktop.
Being no more than 2 to 3 feet from them,they are very ample for near field monitoring.
Also being so close to them (in your face literaly), I don't have much, if any, room refraction issues
Although they would probably sound okay in a larger room,they would be no match to the size panels that you guys have made.
Those big panels are in my todo very soon list as well.jer
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Old 19th May 2010, 12:31 PM   #309
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Jer,
I just orderd a couple of el-cheapo ($13 each) 50VA 2x115v/2x6v toroidal trannys for tryout-- a tandem of these with 115v sides in series and 6v sides parallel will provide the same step-up as my current trannys, which perform beautifully. As these have dual primaries, however, I am quite worried about them possibly shorting out and frying my amp. I don't have any means to test them except to hook them up and feed them some juice and see how they sound. Anyways, if these work, it's a cheap and available source for trannys.
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Old 19th May 2010, 07:55 PM   #310
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Cool let me know were you got them from, I'm going through mine right now and will be posting the specs very soon.
It will be very interesting, as I have learned a great deal about them.
I will be posting the info very soon.
Moms going to Georgia tomorrow and I wish I could go.
I had to redo the brakes on her Rendevous today.
I would be there but I don't have any one to watch the kids (pets) yet,but when she comes back the next trip is to florida to get my amps and appogee dueta's.
If I can find a kid sitter by then I'll be going ,and, try to stop by.
After taking a long needed break and re-hashing every thing I have learned about transformers ,who would think that a couple of turns of wire and a hunk of iron would be so complicated!
By the way,sorry I haven't gotten back to you about the metal yet ,I'm still interested in it ,as the phone is back on now,finaly.
I am doing some drawings an will get back to you on the size.
Any way I can help you determine the specs very easly.
It would be very interesting as to how the new transformers perform.
I need to find I smaller core to use with the little panels so that it can fit inside of the little box.
And,Yes,these do work very very well,in a pinch,But not from a performance standpoint ,It would be better to do a ground up wind.
That is a good price for for a transformer ,very good price.
You will see once I get my data squared away.
IMO ,although time consuming as with any wind,the cores present a higher quality and performance than the typical E-I core that is readily available ,without the problems of restacking and gluing the laminations to keep them from viberating,yet, able to unwind it to make a change.
Just my thoughts for today. jer

Last edited by geraldfryjr; 19th May 2010 at 08:00 PM.
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