Erse inductors in europe ? - diyAudio
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Old 30th September 2012, 11:52 AM   #1
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Default Erse inductors in europe ?

Dear all
I am building (finally have got it chosen) Mark's ER18DXT as a first diy project.
All parts from BOM seems to be fine, but due to Marks choice of Erse inductors- I am unable source them in europe.
Would anybody suggest to alternative to:
2.5 Mh 14 awg 0.36 ohm 800 w (pe number 266-380)
0.22 mh 18 awg 0.19 ohm (pe number 266-808)
0.6 mh 18 awg 0.36 ohm (pe number 266-818)

Would much appreciate help.
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Old 30th September 2012, 12:59 PM   #2
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I am about to get myself into some hot water.

I have purchased quite a few inductors over the years. All where tested before use, why, because I'm a bit anal.

The Erse where always off, and I don't mean a little bit. I would always work backwards and retest some of the Alpha Core's and Mundorf's just to make sure it wasn't the tester.

YMMV, their quality control may have gotten better, or maybe I just got a bad batch.
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Old 30th September 2012, 01:07 PM   #3
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Found here, on diyaudio.

10 Dempingmateriaal 245x325x10.0mm 11.30
1 Dempingmateriaal wit voor 20 liter 2.31
2 Jantzen cross cap 15.0u 400V 6.80
2 Jantzen cross cap 5.10u 400V 3.86
2 Jantzen cross cap 5.60u 400V 4.38
2 Jantzen SUPERES 2.00 Ohm 1% 4.26
2 Jantzen SUPERES 2.40 Ohm 1% 4.26
2 Jantzen SUPERES 27.0 Ohm 1% 4.26
4 Jantzen SUPERES 3.60 Ohm 1% 8.52
2 Jantzen SUPERES 33.0 Ohm 1% 4.26
4 Jantzen Wire air coil 0,220mH 0,205Ohm 1,00mm 8.00
2 Jantzen Wire air coil 0,600mH 0,370Ohm 1,00mm 6.38
2 Jantzen Wire air coil 2,500mH 0,410Ohm 1,60mm 43.50
6 Luidspreker OFC kabel 2 x 4mm (per meter) 15.06
2 MKP polipropyleen folie condensator 3F 250V 3.62
2 Monacor Luidspreker terminal met vergulde connectors* 13.10
2 Port tube 50 x 145 5.72

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Old 30th September 2012, 01:17 PM   #4
xjr100 is offline xjr100  Europe
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Quote:
Originally Posted by voxxonline View Post
2.5 Mh 14 awg 0.36 ohm 800 w (pe number 266-380)
Mundorf L140 2.7mH 0.51Ohm - you can unwind it and get 2.5mH and keep about same resistance as Erse
Quote:
Originally Posted by voxxonline View Post
0.22 mh 18 awg 0.19 ohm (pe number 266-808)
Mundorf L100-0,22 - resistanse abit higher - 0,21Ohmm but guess it's OK

Quote:
Originally Posted by voxxonline View Post
0.6 mh 18 awg 0.36 ohm (pe number 266-818)
Mundorf L100-0,68 0.39Ohm and unwind it
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Old 30th September 2012, 02:09 PM   #5
system7 is offline system7  United Kingdom
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These are all air-cored coils. Anything similar will do. 14 guage for the 2.5mH is just keeping the resistance low around 0.36 ohm, but it's not critical. You could adjust R1 in the tweeter crossover to compensate anyway.

The Seas ER18DXT ported two way

Really can't see anything magical about those ERSE coils. They are copper, they are round, they aren't ferrite cored. That's it.
Attached Images
File Type: jpg Mark's_ER18DXT_Crossover.JPG (77.5 KB, 220 views)
File Type: jpg Mark's_ER18DXT_Crossover_Schematic.JPG (41.9 KB, 217 views)
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Well, there it is! Best regards from Steve in Portsmouth, UK.
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Old 30th September 2012, 03:27 PM   #6
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Thank you.
It is just crossover part of equation is still unknown for me.
Will read into theory.

Fingers crossed I will do everything right and will like these speakers...
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Old 30th September 2012, 03:30 PM   #7
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And I mentioned erse because they are specified by author.
I don't care which brand, as long as it is good and does not impact sound bad way.
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Old 30th September 2012, 04:30 PM   #8
xjr100 is offline xjr100  Europe
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Quote:
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I don't care which brand, as long as it is good and does not impact sound bad way.
Just one note on C2: use best possible capacitor there.
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Old 30th September 2012, 04:38 PM   #9
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Ok, but which one for example ( hope cap not twice the price of the drivers).

And why thy C2 is so critical to SQ ?
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Old 30th September 2012, 06:21 PM   #10
xjr100 is offline xjr100  Europe
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Quote:
Originally Posted by voxxonline View Post
Ok, but which one for example ( hope cap not twice the price of the drivers).

And why thy C2 is so critical to SQ ?
For that project my suggestion for C2 is Auricap XO - it is extrememely neutral with high resolution and will provide deeper sound. You can use here Mundorf MCap Supreme, but it will not give such deepnes as Auricap XO. If you will use here Mundorf MCap400 - it will add some "syntetics"; something like Bennic, Solen will add "harshnes" - but it is my personal oppinion, sugest the best here Auricap XO.

For other caps: you can use inexpensive Mundorf MCap400.
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Last edited by xjr100; 30th September 2012 at 06:24 PM.
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