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Old 16th January 2010, 01:02 AM   #21
DIFORCE is offline DIFORCE  Australia
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So what about that port lenght mark
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Old 17th January 2010, 03:24 PM   #22
Juhazi is offline Juhazi  Finland
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Default Sound good!

Hi guys, I may have a pair of the earliest speakers with Mark's ERDXT design.
I used my Zaph L18 boxes, just dropped in new parts in December 09. The magic lies in waveguide and 2nd order xo low enough in freq, I think. I really love the sound and they work wonderfully for my needs - a living room-HT-stereo-allround-background etc. For serious 2ch audiophile listening I would want something special (dipole, WMTMW...)

Fiddling with cabinet volume and stuffing has very minor effects and one's room and placement have even more effect. So fiddling with port tuning and stuffing is anyway recommended and is always reversible, so don't worry about that, just try it and make it sound the best for your ears.

Mark gave me good support by email, but sorry I don't have good enough measuring system to post any graphs. In general I think this must be one of the best reasonably-priced 2way designs. Im quite sure that Jon's new Modula will be very close.

Go for it!
Juha
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Old 17th January 2010, 06:48 PM   #23
DIFORCE is offline DIFORCE  Australia
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So what's your final decidion on port lenght ? I really wanna do it by the book
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Old 19th January 2010, 02:31 AM   #24
ucla88 is offline ucla88  Tahiti
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Oh, you thought I meant last weekend...

Probably the best way to explain the port length it to look at Zaph's PDF.

Zaph's inner tube length is 2.25 (see the pdf) and mine is 2.75".

It's a precision 2" flared port. The total length is 7.75"-which is what you get when you trim the center piece to 2.75".

Hopefully that was clear. If you're using a straight tube you're just going to have to experiment a bit.
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Last edited by ucla88; 19th January 2010 at 02:31 AM. Reason: link to Zaph's pdf.
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Old 19th January 2010, 02:33 AM   #25
ucla88 is offline ucla88  Tahiti
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Quote:
Originally Posted by Juhazi View Post
Hi guys, I may have a pair of the earliest speakers with Mark's ERDXT design.
I used my Zaph L18 boxes, just dropped in new parts in December 09. The magic lies in waveguide and 2nd order xo low enough in freq, I think. I really love the sound and they work wonderfully for my needs - a living room-HT-stereo-allround-background etc. For serious 2ch audiophile listening I would want something special (dipole, WMTMW...)

Fiddling with cabinet volume and stuffing has very minor effects and one's room and placement have even more effect. So fiddling with port tuning and stuffing is anyway recommended and is always reversible, so don't worry about that, just try it and make it sound the best for your ears.

Mark gave me good support by email, but sorry I don't have good enough measuring system to post any graphs. In general I think this must be one of the best reasonably-priced 2way designs. Im quite sure that Jon's new Modula will be very close.

Go for it!
Juha
Thanks for the kind words!
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Old 5th February 2010, 04:31 PM   #26
Sypher is offline Sypher  France
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Hi
I'm interested in the ER18DXT, but the problem is that several capacitor and inductor values are not sold on European sites.
(for example 2.5mh, 0.6mh, 5.1µf...)
For capacitor we can manage by adding values but for inductors it's

Would it be possible to get a version of the filter with normalized values?
(for example with 2.2mh OR 2.7 but not 2.5)
for 0.6mh I can take a 5.6 instead I guess.

Last edited by Sypher; 5th February 2010 at 04:33 PM.
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Old 5th February 2010, 04:41 PM   #27
DIFORCE is offline DIFORCE  Australia
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Order from parts express , would cost around 70$ shipping fees to europe , better safe then sorry
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Old 5th February 2010, 06:15 PM   #28
Sypher is offline Sypher  France
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If you add up VAT, customs taxes etc, it ammounts to more than the components
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Old 5th February 2010, 10:52 PM   #29
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Unwind coils and measure value with a simple multimeter from i.e. Selectronic:
SELECTRONIC ::: L'univers électronique :::
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Old 6th February 2010, 09:54 AM   #30
Juhazi is offline Juhazi  Finland
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European xo-parts are mainly from German sources (Intertechnic), here is a list of my compenents for ER18DXT. Generally within 10% is quite good, hardly hearable. One can also connect components in series or parallel to get right values. Unwinding a coil is easy but measuring?

I can't measure my speakers (well) but at least I like the sound!

L3 aircoil CU 1.00 mm 0.56 mH; (1,00mm should be 18AWG and
1,4mm 15G)
L2,L4 aircoil CU 1.00 mm 0.22 mH;
L1 aircoil CU 1.40 mm 2.70 mH;
C2 Audyn Cap 5.60 uF 400 V 5%;
C4 Audyn Cap 15.00uF 400 V 5%;
C3 Audyn Cap 4.70 uF 400 V 5%;
C5 Audyn Cap 2.70 uF 400 V 5%;
R2 MOX 10W 2.20 ohm;
R1 MOX 10W 2.70 ohm;
R5 MOX 10W 33.0+27.0 ohm (in series);
R3,R4, ceramic 10W 3.30 ohm;

Price for speakers were 268 EUR including taxes and shipping from
europe-audio.com Netherlands to Finland. XO parts were 130 EUR (1 EUR is
roughly 1,4 USD) from a Finnish vendor
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