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Multi-Way Conventional loudspeakers with crossovers

Recommend Mox resistors from Mundorf and Jantzen Audio
Recommend Mox resistors from Mundorf and Jantzen Audio
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Old 15th April 2019, 11:42 PM   #1
StewartH83 is offline StewartH83  England
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Default Recommend Mox resistors from Mundorf and Jantzen Audio

I've put a bit of time lately in a pair of 3 and a 1/2 way floorstanders with two 10" woofers

Firstly I felt the range on the woofers were too wide. Without wanting to mess with the inductors on them I increased the caps from x2 2.0uF to a 2.0uF and a 2.2uF. This dropping the range I was happy with. So installed a 2uF cross cap from Jantzen and 2.2uF by Claritycap ESR. Even though its only woofers the low end was so much precise compared to the electro of closest value.

I then wanted less range from the Seas tweeter I replaced as the standards blown. I increased the resistor value on the tweeter from 4uF (ceramic) to 4.9uF (Mundorf MOX). This was too much so went down to 4.6UF (Jantzen) and was far better. Tweeter is not so forward and directed. The details the resistor changes was surprising. I even tested all sorts of Mox resistors at first with the original 4uF and could tell MOX were far better.

I then changed two 15uF electro caps for a 30uF (huge!) crosscap and 0.001uF 630v and a straight swap on the midrange 3.3 resistor from ceramic to Jantzen Mox and that was so much smoother in the midrange. So impressive to my sensitive ears.

I feel replacing resistors to Mox from Mundorf (best build) and Jantzen should be standard if improving loudspeakers and also other brand MOX resistors in front end equipment as I did with PSU and anolog input on a Yamaha amp this week. I will picture the crossover tomorrow to see if anyone thinks I can improve it further ��☺️

Thanks to all info on DIY Audio!

Last edited by StewartH83; 16th April 2019 at 01:31 AM.
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Old 16th April 2019, 12:11 AM   #2
nigelwright7557 is offline nigelwright7557  United Kingdom
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A resistor really shouldn't be changing the sound unless it is capacitive or inductive which means it is no longer a pure resistor.
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Old 16th April 2019, 12:44 AM   #3
StewartH83 is offline StewartH83  England
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Hi Nigel, thanks for the info!

I seemed to hear much less grain straight away. This was previously annoying and capacitor changes only seemed to promote it further. The more Mox resistors I've added in the system the less 'squashed' the frequencies appear. The sound stage opened up slightly, bit by bit

Not dramatic, I'm not wanted to come across like they are complete system changes.

I can't say your wrong, as maybe the resistors were no good I have compared them too. Definitely can't tell a difference between brands of the same value
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Old 16th April 2019, 08:56 AM   #4
Mario Pankov is offline Mario Pankov  Europe
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Recommend Mox resistors from Mundorf and Jantzen Audio
MOX resistors are inductive, no matter what manufacturers claim. The only non-inductive resistors are those that use an Ayrton-Perry winding. To save you some bucks - the highly praised Mills (non-inductive, using the above forementioned tech) are made by Vishay in their Mexico plant. You can go to digikey.co.uk and look up non-inductive wirewound resistors, you`ll find Vishay (probably the same as the Mills but far less costly), Ohmite and others. Non-inductive makes sense on tweeter only.
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Old 16th April 2019, 11:15 AM   #5
HorvathS is offline HorvathS  Hungary
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http://www.acoustic-dimension.com/mu...HIFICritic.pdf

I use Jantzen Superes 10W and Mundorf MResist 20W.
Both are good, but the Mundorf 3* price.
Mills and Duelund are expensive too.
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Old 16th April 2019, 01:50 PM   #6
StewartH83 is offline StewartH83  England
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[QUOTE=Mario Pankov;5762093]MOX resistors are inductive, no matter what manufacturers claim. The only non-inductive resistors are those that use an Ayrton-Perry winding. To save you some bucks - the highly praised Mills (non-inductive, using the above forementioned tech) are made by Vishay in their Mexico plant. You can go to digikey.co.uk and look up non-inductive wirewound resistors, you`ll find Vishay (probably the same as the Mills but far less costly), Ohmite and others. Non-inductive makes sense on tweeter only.

I am lead to believe the Mills are better and will try them. I'm going to order some Vishays products for my equipment after recapping so I can find differences.
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Old 16th April 2019, 01:55 PM   #7
StewartH83 is offline StewartH83  England
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[QUOTE=HorvathS;5762195]http://www.acoustic-dimension.com/mu...HIFICritic.pdf

I use Jantzen Superes 10W and Mundorf MResist 20W.
Both are good, but the Mundorf 3* price.
Mills and Duelund are expensive too.

It's the Superes from Jantzen I have installed at the minute, smaller than Mundorf similer resistors

I have read the Ohmite are great for midrange improvement yet those granite Duelunds seem too expensive to justify on my Seas loudspeakers
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Old 16th April 2019, 02:13 PM   #8
ICG is offline ICG  Germany
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Quote:
Originally Posted by Mario Pankov View Post
MOX resistors are inductive, no matter what manufacturers claim.
According to this page the inductance of a MOX resistor is at 3 – 200 nH. While that is technically true they aren't actually non-inductive, it's pretty close though. In a speaker crossover and its frequencies, you will not be able to hear any difference or measure it, even the repeat measurement error is quite higher than the influence of its inductance. Even the wires on your crossover got a higher inductance. To compare that, it's roughly in the same range of inductance like foil capacitors are. Your linked article speaks about "however, as seen in the test values, the inductance was essentially negligible." too.
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Old 16th April 2019, 04:54 PM   #9
HorvathS is offline HorvathS  Hungary
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I tried a lot of resistors (and capacitors also)
Every parts have own sound. (why we change cables, dacs, amps, etc)
The best price/value is - imo - the Jantzen Superes.
For a 40 EUR tweeter the 10 EUR Mundorf MResist Supreme a bit expensive.
S
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Old 16th April 2019, 09:46 PM   #10
ICG is offline ICG  Germany
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Quote:
Originally Posted by HorvathS View Post
I tried a lot of resistors (and capacitors also)
Every parts have own sound. (why we change cables, dacs, amps, etc)
I didn't say it's wrong that a lot of parts got different influence on the sound. I wanted to make clear, it's the wrong reason to avoid MOX resistors because of the inductance. MOX Rs sound a lot better than cement/wire resistors.

Quote:
Originally Posted by HorvathS View Post
The best price/value is - imo - the Jantzen Superes.
For a 40 EUR tweeter the 10 EUR Mundorf MResist Supreme a bit expensive.
S
Jantzen got a very good to excellent P/V ratio and very good quality aswell. There are projects I'd probably use other brands or recycle some parts. Jantzen doesn't got all types of parts though. They don't have transformer core coils or bell housing coils i.e. but on the other hand you can get coils with such a vast number of different values, much more than most others do. That's a huge advantage, it saves the trouble and postage to order parts from different shops.
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