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Old 10th January 2013, 05:00 PM   #41
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Quote:
Originally Posted by tyu View Post
Has anyone done test with Antek Tranfourmers with a passive crossover are any crossover in line??....say sets at 250-300hz upslop??...
Or are these test done full rang.
I know this may have been ask alredy...some where...
Thanks for any an all info on ESLs
I've only done listening tests, not measurements, with the Antek An-506 tandem setup crossed over at 225Hz & 24db/oct slope using an active crossover upstream of the power amp. I assumed they would not be suitable for full range operation. I can only attest that they sound really good when crossed as I described.
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Old 12th January 2013, 03:50 AM   #42
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Quote:
Originally Posted by tyu View Post
Has anyone done test with Antek Tranfourmers with a passive crossover are any crossover in line??....say sets at 250-300hz upslop??...
Or are these test done full rang.
Hello tyu,
I did try a 300 Hz passive 2nd order crossover with the Antek and it worked well, no signs of core related distortion.

Quote:
Originally Posted by tyu View Post
This is the panel crossover setup i am use now.....this come from ML. Do you think i can setup the Antek AN-0506 this way.
You could use two Antek's to do something similar, but the step-up ratio would only be about half of the ML transformer.

I redrew you crossover in Figure (A) Did I get it correct?
Can you tell me what ML model this is for?

All of the ML crossovers I have seen or worked on included an inductor across whole or part of the primary as shown in Figure (B) & (C) to provide a stable inductance for the high-pass crossover to work with. Sometimes there was a resistor in series with the inductor.

Does your crossover have such an inductor?
Thanks for sharing this ML info.
Attached Images
File Type: gif ML_xovr3.gif (33.2 KB, 147 views)

Last edited by bolserst; 12th January 2013 at 03:54 AM.
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Old 12th January 2013, 11:24 AM   #43
tyu is offline tyu  United States
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Thanks for your Art...Bolsterst
You have the SL3 crossover if not go to the MLC site you can get most All ML there.
With the crossover in the SL3 an the Ascent,Ascent i,thay put a induckter in,2.5mh in the center tap to the Neg input, in,the SL3 there is a 1ohm 20watt.
The Acent,i thay went to the just the induckter,2.5mh to ground.
In the Re-Qust, Odyssey, Proidgy thay went to the crossover input on the center tap.
As you know i have been working with all the logans i have had,from The Aerius, SL3,CLS, Ascent,i,Proidgy....two pr own some.

What I would like to know if you can tell me,if the induckter is ran to the neg input only then to the centap. it like i get more output, or is it just ezer for the amp too drive??.... With nothing on any of the center taps of the prmary side of the stepup Xfourmer thay sound Great ...but it takes more power to drive them.
But my lov of the sound of a 60watt tube amps wont drive them, so i set them up with a switch, so when i use sand amps i can pull the center tap off the neg input... on The SL3 an the Acents,an others the swetch is all ready there it was for the base drop...-3db.. i never used this
If a 1ohm res.an the induckter is added, like in the SL3 centap, it sound diff,Not better...well to me.
I have put the Ascent crossover in the SL3s, where it put the 30mf cap in front of the 3ea.3ohm res. This get the fullrang from hiting the res.frist an can case ringing , Sounds sweeter,a littel more forgiving.I like it a lot,other may find this a upgread! All the same partes are there in the SL3.you can go back if you dont like.
So do you think the induckter can work as to add inductens to just one of the Antek Xfourmer?
An have you done any Center tap primary crossover setups with setup Xfourmers?
It a funky setup,??
Thay put the input res. to the crossover back in frount ,so thay get hit by fullrang,i dont know if thay did this just so it would sound diff when you did a side by side set,so you would here a diff an pay more $$,same panel size?....i know the woffer are diff. but....
thanks for any an all the info you have on get the best sound out of All ESLs

Last edited by tyu; 12th January 2013 at 11:27 AM.
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Old 12th January 2013, 12:36 PM   #44
tyu is offline tyu  United States
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A. is right...it was a mix i came up with... for the SL3 An Ascent ...the Re-qust an the Odyssey...parts i had on hand. All there tranfourmers are the same but for the re-qust.
The Proidgy uses two pr speaker....like the Xfourmer SL3 an other... i do not get the inducters?? the Sl3s an the Ascent have the inducters on the centap of the primary...i thought it was to set the stepup xfourmers to just use 1/2 the windings...but if i run the center tap to the neg input only...i get less output....?? Can you tell me what adding the 1ohm dose to the inducker...flotet more.. give even more output???
For me on these ML crossover one clools thing i got was the Zobel thay came up with for the Res...Vary cool i never saw that befor an it works great!.....
Thanks
Sorry as you can seeee.... my brain is not wired like others...it setup for 220 an it only geting 110...Maybe........

Last edited by tyu; 12th January 2013 at 12:56 PM.
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Old 12th January 2013, 01:36 PM   #45
tyu is offline tyu  United States
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Default ML crossover

Had to go to a diff PC....so all can see
Attached Files
File Type: pdf request_xo.pdf (9.8 KB, 13 views)
File Type: pdf martin-logan odyssey crossover schematic.pdf (14.1 KB, 17 views)
File Type: pdf ascent crossover schematic.pdf (10.4 KB, 11 views)
File Type: pdf sl3 crossover schematic.PDF (8.7 KB, 13 views)

Last edited by tyu; 12th January 2013 at 01:48 PM.
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Old 13th January 2013, 04:50 AM   #46
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Hello tyu,

That's a lot of questions on the ML SL3 crossover. I'll see if I can answer them.

1) What is the purpose of the 2.5mH inductor connected to the CT of the primary?
Looking at Figure (A) you can see that the (2.5mH + 1ohm) is connected across half of the primary turns. By transformer action, the impedance seen by the crossover network will be that of a (10mH + 4ohm) network. In fact Figure (B) is electrically identical and produces the same response and load impedance. It is a common arrangement for ESL hybrid passive crossovers.

So, why did ML bother with the CT loading? Perhaps it comes down to $.
A 2.5mH inductor is cheaper and smaller than a 10mH.

2) Why doesn’t connecting the CT to ground result in higher output?
Figure (C) shows this arrangement. Since the number of primary turns were halved, the step-up ratio would be doubled so it would make sense to expect higher output. But, halving the primary turns reduces the impedance the transformer loads the crossover with by a factor of 4! To get the expected higher output, you would need to change the 1ohm resistor to 0.25ohm, and the 30uF capacitor with a 120uF capacitor. This would give you higher output if your amplifier could handle the resulting impedance that now dips below 1ohm in the midrange.

3) What happens when I remove the 1ohm resistor in series with the 2.5mH going to the CT?
Attachment #2 shows a comparison of response and impedance with and without the 1 ohm resistor. The Blue curve is with the 1 ohm resistor. You can see that removing the resistor boosts the output above the 300Hz crossover by about 3dB. At this same frequency, impedance drops by 2 ohm to just under 4 ohm.

4) What happens when I completely remove the 2.5mH inductor from the circuit?
Figure (D) shows this arrangement. Without any inductor, the load seen by the crossover at lower frequencies is mainly defined by the primary inductance which changes with signal level. In general you will probably be playing the panel lower than the 300Hz crossover, but will not have the proper equalization above crossover.

5) Can the Antek transformers by used with the SL3 crossover?
Yes, if you use Figure (B) you would have nearly the same step-up ratio and response as ML.
Of course you would probably need to tweak component values to compensate for differences in transformer inductance and parasitics.
Attached Images
File Type: gif ML_SL3_options.gif (25.7 KB, 117 views)
File Type: gif ML_SL3_boost.gif (47.9 KB, 107 views)
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Old 13th January 2013, 11:10 AM   #47
tyu is offline tyu  United States
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Thanks for your time... Bolserst......Vary cool info....
So do you see the Crossover setup useing the centap as in the Odyssey as a way to get beter sound an more output... are just a way to make the sound of the same xfourmer an panels sound diff??

I have Put the Xfourmer out of the SL3s in the Acoustat 121 interface a put the Odyssry type crossoven in on the centape an done some other mades ....like on the sedary side ran the setup like Soundlabe dose with out the 50k res......Just the .1mf caps in the setup an have got great sound an can run the 3ea panel M3 to full output...
Great fun...
Attached Images
File Type: jpg Untitled01.jpg (22.9 KB, 19 views)

Last edited by tyu; 13th January 2013 at 11:29 AM.
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Old 13th January 2013, 12:35 PM   #48
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The ML CLX high frequency panel torrid has 4 input taps so I'll guess it's the same transformer as the rest as the ML reserve series. (And they just choose the tap to suit the different models and just have 1 part to inventory /buy in better volume).

The CLX LF EI core has no taps. Later this spring a friends CLX will get upgraded next and we'll take pictures of each board, the magnetics, and trace the crossover schematic for the curious out there.
They did use high speed/soft recovery diodes in the HV step up supplies ( 2 supplies one for Hf and LF with what seems to be different number of steps in each so different operating voltage?).

Another friend has a ML Electromotions - the step up is a tiny EI not much larger than a wall wart.
The crossover is electrolytics in the LF section and polyesters in the HF section.

The Dayton Wright XG8/10 used a 39 pound EI core 80,000 ohm secondary made by Hammond, although it was crossed over to a tweeter (Piezo at first , ribbon later) at about 3k. It used just a small air core choke in series with the transformer to roll off the HF output of the cells. It also used a series 4 ohm power resistor in series with the input (bypassed with a 750 uf motor start cap) to provide some series impedance for early solid state amps fragile output stages- which Nelson Pass / Joe Sammut bypassed for clients with beefier Threshold amps)

Last edited by ticknpop; 13th January 2013 at 12:54 PM.
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Old 13th January 2013, 01:07 PM   #49
tyu is offline tyu  United States
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Yes Post all an any info on ML an any others ESL... The Look of the size of the.torrid in the summit look just like the Antek transformers
i know that it not........i gess i well have to go with some torrids...or i well never know?? if there sound is better or just diff.......................................
thanks for your time also..
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Old 14th January 2013, 01:03 AM   #50
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Quote:
Originally Posted by tyu View Post
So do you see the Crossover setup useing the centap as in the Odyssey as a way to get beter sound an more output... are just a way to make the sound of the same xfourmer an panels sound diff??
The Odyssey crossover is basically a tweak of the SL3 crossover arrangement shown in Figure (B) from post#46.
A lot of added complexity for what may be a small audible improvement.

Driving the center-tap with a series RLC network fills in the dip in the response just above crossover providing a more linear equalization of the dipole roll off in the 300Hz - 600Hz range. There is quite a bit of interaction between the CT drive and the main drive signals, so a lot of modeling and measuring went in to optimizing the parts values.

Attachment shows simulated response with and without the center tap drive connected.
Blue = with CT drive
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File Type: gif ML_odys.gif (17.8 KB, 96 views)
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