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Thread: Is biasing the N250TI network worth it in 2016?

  1. #1
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    Is biasing the N250TI network worth it in 2016?

    While waiting for my 250TI's to arrive I have been contemplating potential upgrades.

    I always intended to bias them but came across a thread where 4313b mentioned that when using Sonicaps there is no need to bias. A quick search regarding this brought up this thread

    http://www.audioheritage.org/vbullet...p/t-37060.html

    Which yielded no answer to the question initially asked. If I use higher end Jantzens/Mundorfs/Sonicaps is there a need to bias????

    I would rather keep the network simple and spend dollars on wax coils if there is no need to bias.

    I have a pair of biased L212's and the difference was not subtle but used Jantzen crosscaps, nothing special.

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    Quote Originally Posted by kelossus View Post
    While waiting for my 250TI's to arrive I have been contemplating potential upgrades.

    I always intended to bias them but came across a thread where 4313b mentioned that when using Sonicaps there is no need to bias. A quick search regarding this brought up this thread

    http://www.audioheritage.org/vbullet...p/t-37060.html

    Which yielded no answer to the question initially asked. If I use higher end Jantzens/Mundorfs/Sonicaps is there a need to bias????

    I would rather keep the network simple and spend dollars on wax coils if there is no need to bias.

    I have a pair of biased L212's and the difference was not subtle but used Jantzen crosscaps, nothing special.
    I may be mistaken, but I do not believe 4313B has ever suggested that a biased network is not an improvement, in fact quite the opposite

    That thread you linked to doesn't appear to suggest that either, it is a discussion of the bias voltage and if "boutique" caps offer any advantage over less ambitious (read: reasonably priced) alternatives in either design but primarily in charge coupled executions

    That, and the frequently encountered wishful thinking (aloud) that somehow, if one were to spend enough money on caps, and NOT charge couple them then that would prove superior to charged coupled designs

    The evidence would suggest that not to be the case. These (this) question comes up routinely and generally does not end well

    One poster ("NickH") is the only one who seemed to have a different purely anecdotal opinion despite the evidence provided, by Greg Timbers, numerous threads here delving deeply into the type and even the actions of JBL

    Much energy is spent by many in attempts to "theoretically" explain away the advantages of charge coupling and often by folks who have never even given it a try, a build or a listen

    I guess, in all fairness, maybe Nick can't discern a difference and that's fine too. From what I can gather (and I may be wrong on this one too), "NickH" has never heard, built or owned a system employing charge couple network and arrived at his conclusions from what he has "read and heard" (again, based upon his remarks).

    That obviously doesn't prove anything though as I am certain there are numerous speaker systems in this world on which a charge coupled network would be a waste of time and money anyway as well

    Solen and to some extent Dayton appear to be the cap of choice for most of these implementations

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    Quote Originally Posted by kelossus View Post

    I always intended to bias them but came across a thread where 4313b mentioned that when using Sonicaps there is no need to bias. A quick search regarding this brought up this thread

    .
    I believe (I could be mistaken) 4313B (Giskard) was referring to not needing to use bypass caps with Sonicaps. If 4313B (Giskard) did say "biasing was not necessary", it was probably laced with a substantial amount of sarcasm

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    Senior Member Ian Mackenzie's Avatar
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    Quote Originally Posted by kelossus View Post
    While waiting for my 250TI's to arrive I have been contemplating potential upgrades.

    I always intended to bias them but came across a thread where 4313b mentioned that when using Sonicaps there is no need to bias. A quick search regarding this brought up this thread

    http://www.audioheritage.org/vbullet...p/t-37060.html

    Which yielded no answer to the question initially asked. If I use higher end Jantzens/Mundorfs/Sonicaps is there a need to bias????

    I would rather keep the network simple and spend dollars on wax coils if there is no need to bias.

    I have a pair of biased L212's and the difference was not subtle but used Jantzen crosscaps, nothing special.

    Context can be a wonderful thing as can rational thinking.

    At the time there was a trial and error with bypassing capacitors and sonic caps were discussed.

    JBL were bypassing polyester capacitors with 0.01 uf polypropolyn capacitors

    This is how Sonicaps were used.

    In diy there is no consistency but in production there is and JBL has provided a working cc network that they are happy with.

    Will the other alternatives perform the same or different to the CC Solen network?

    I think Greg was actually asked this,question once and it comes down to the budget.

    If you care to check the prices the cost of a network like this can blow out to rediculous sums for what is the law of dismissing returns.

    The choice is yours

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    This is the quote from Giskard:4313B
    09-27-2004, 10:26 PM

    The bypass capacitors go a long way in improving the performance of the larger capacitors.

    One can also use charge-coupled Solen capacitors to great effect.

    The most expensive route is to replace all the stock capacitors with SoniCaps. They don't require charge-coupling or bypass capacitors.




    From this thread: http://www.audioheritage.org/vbullet...hp/t-3330.html

    I was also under the impression that if you are using a decent polycap like Solens or Jantzens once charge coupled there would be no difference. Jantzens are just easier for me to source locally and would work out cheaper than international freight.

    Also are wax coils a benefit? Particularly in the Tweeter and Mid-range networks?

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    I can never understand why one would not bypass any larger value capacitor. It makes good sense as it has the effect to cancel
    the capacitors inductance.

    Allan.

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    Quote Originally Posted by kelossus View Post
    I was also under the impression that if you are using a decent polycap like Solens or Jantzens once charge coupled there would be no difference. Jantzens are just easier for me to source locally and would work out cheaper than international freight.
    You can try searching for SCR caps. This is the compagny that produces them for Solen:
    http://www.toutlehautparleur.com/con...pb-et-ppe.html

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    Ok I found an Australian distributor for the SCR fast caps but they are nearly twice the price. A 20uf is 24.46 and the Jantzen equivalent is 12.00.

    EDIT:

    Just checked the US prices for a 20uf and it is roughly $10aud, then you factor in shipping and it will work out more costly.

    If the Daytons and the SCRs are commonly used why not the Jantzens? They are well made....I think....

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    Quote Originally Posted by Ian Mackenzie View Post
    Context can be a wonderful thing as can rational thinking.

    Will the other alternatives perform the same or different to the CC Solen network?

    I think Greg was actually asked this,question once and it comes down to the budget.

    If you care to check the prices the cost of a network like this can blow out to rediculous sums for what is the law of dismissing returns.

    The choice is yours
    I am more then aware the costs of building networks. The biased 250TI network works out to around $1100 and that includes wax coils for tweeter/midrange, air coils for midbass, p-core for woofer. MOX resistors and obviously the capacitors.

  10. #10
    Senior Member Ian Mackenzie's Avatar
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    Okay

    Go for top of the range Mundorf Silver /Gold Oil and figure out the prices?

    Some years ago l spent around 18 months testing and evaluating capacitors from a stock bypassed JBL crossover, the best Mundorfs to Auricaps to Clarity SA caps, bypassed SA Clarity caps with 0.01 Auricap, bypassed polyester with polypropolyne, and Charge Coupled Solen Fast Caps.

    I also purchased a reference Lavry DAC and hi end directional digital coaxial cable as a base line.

    Electronics Pass Labs

    What l gained from the experience is that engineers like Greg do things for a reason.

    Why. It ultimately comes down to the voicing of the overall system and getting that right for a given end market.

    This is a real challenge.

    With voicing everything matters including parts in crossovers.

    Some drivers might work well with bypassed caps and certain brands and part numbers. Ie soft dome /paper drivers compared to hard dome metal diaphragms are a totally different animal and things change when you use acquaplas dusted titanium and beryllium. Getting particular brands of caps to match drivers is not trivial and bypassing just complicates the the process.

    The Charge Coupled Fast Cap Solens worked brilliantly and complimented the JBL driver sound in my evaluation.

  11. #11
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    Greg Timbers did two pairs of charge-coupled 250Ti networks for his friends and the results got rave reviews.

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    "kelossus", are you
    Asking a question?
    Arguing a point(s)
    or, just sharing your decision making process (internal struggle) out loud with the forum?

    I am confused because of the ancient quotes you have dug up which appear to substantiate the way you are (or want) to lean

    Do you already own anything that's charge coupled?

    If you are finding it difficult to make a decision then just run your speakers with "regular" networks and see how it goes and then make a decsion after the jitters have died down, that, or make the decision to trust Greg Timbers and 4313B and just go for it

    The only negative with the later is that you won't have had the opportunity to experience the difference the CCing made

    Oh, and don't piss away good money on ridiculously priced boutique caps, 99% of it, 99% of the time is

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    Quote Originally Posted by kelossus View Post
    This is the quote from Giskard:4313B
    09-27-2004, 10:26 PM

    The bypass capacitors go a long way in improving the performance of the larger capacitors.

    One can also use charge-coupled Solen capacitors to great effect.

    The most expensive route is to replace all the stock capacitors with Sonic Caps. They don't require charge-coupling or bypass capacitors.




    From this thread: http://www.audioheritage.org/vbullet...hp/t-3330.html

    I was also under the impression that if you are using a decent polycap like Solens or Jantzens once charge coupled there would be no difference. Jantzens are just easier for me to source locally and would work out cheaper than international freight.

    Also are wax coils a benefit? Particularly in the Tweeter and Mid-range networks?
    Yes. Jeff at Sonic Craft and I had a decent conversation about that way back then. I think if you search other posts for the N250Ti charge-coupled networks I built many years ago you will see that they all used Solen parts.

    The short story ends up being that I nearly always charge-couple Solen capacitors (although just last weekend I took apart a pair of 4365 networks where I had used all Janzten Cross-Caps instead of Solen capacitors).

  14. #14
    Senior Member Ian Mackenzie's Avatar
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    From Post by Giskard in link above

    Again, I have to warn anyone who wants to start modifying stock filters that JBL does extensive listening evaluations of their systems and changing capacitor dielectrics or inductor DCR values from stock can yield really good results as well as really bad results.

    I completely agree as stated in my earlier post.

    In theory you could argue that if you had enough JBL DX1 active crossovers and made the necessary changes to match the voltage drives it would make an interesting baseline to evaluate the impact of crossover capacitors. I would not be surprised if Greg has already done that.

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    Quote Originally Posted by Ian Mackenzie View Post
    From Post by Giskard in link above

    Again, I have to warn anyone who wants to start modifying stock filters that JBL does extensive listening evaluations of their systems and changing capacitor dielectrics or inductor DCR values from stock can yield really good results as well as really bad results.

    I completely agree as stated in my earlier post.

    In theory you could argue that if you had enough JBL DX1 active crossovers and made the necessary changes to match the voltage drives it would make an interesting baseline to evaluate the impact of crossover capacitors. I would not be surprised if Greg has already done that.
    Hmmmm......if DCR is such an issue shouldn't all the DCR's in the biased N250TI network be listed? In the past I have always gone for low dcr coils even when using wax or air. I will never use anything with a DCR of >0.5ohm unless the inductor is specified otherwise. I thought this was enough.

    Also do the Solens Fastcaps and Daytons dielectrics match or come close too the original?

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