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46 minutes ago, vladd said:
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In the original Gold's passive crossover, the 3khz notch filter cannot cure the drivers inherent ~3khz resonance anomalies, (tannoy honk) it can only attempt to reduce the excitation of the resonance(s) by actually preventing similar frequencies (tone) in the composite audio intelligence (music) from actually getting to the driver. IE by taking out part of the music on either side of the resonance as well as those tones with similar frequency to the resonance,
In preserving the original filter's passive sonic characteristics, 'Q' and notch depth, improvement of the 3knz notch symmetry about the centre frequency has been made, (blue trace), allowing about 1.25db more detail for over an octave of the important midtones preceding the notch.

Ovo je sad najluđe ovde što piše.... Ja nemam 3khz anomaliju. Merio 5 puta i nema je. Niti je fabričkom skretnicom  predviđen 3K notch filter. 

Rackham approved. Šta su izvodili sa ovom prvom serijom plastičnih membrana koje uopšte ne zvuče plastično samo on zna.....Igrali se ljudi sa polimerima.

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https://hackaday.io/project/10264-laser-cut-speaker-enclosure/log/35215-a-brief-overview-of-the-physics-of-crossovers

Ono sto je lik naceo, a u sustini je neintuitivno, tako reci multiphysics, je desavanja u kalemovima, koji transferisu struju u polje, a onda to vracaju u sistem. I to polje na neki nacin titra u visokim frekvencijama, sprecavajuci doticnu energiju visokih da prodje dalje, i recimo dodje do npr bas zvucnika, ali sigurno da prave uticaj i na one frekvencije koje propustaju, plus vracanje energije u sistem. Za razliku od kondova koji to svlace na masu, otsecaju, ili otpornika koji permanento  smanjuju-koriguju struju..pretvarajuci je u toplotu-nepovratan proces.

Za razliku od aktive, koja je bas nalik na R-C desavanja, bez interakcije povratka energije u sistem, ka zvucniku, prakticno bez upliva otsecenih frekvencija.

Cisto kao info, ne zamlacujem se previse sotim, bar dok se ne dokopam nekakvih "tanojica.com"... :D 

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2 hours ago, neskor said:

skoro sam probao i digitalnu skretnicu MiniDSP 2x4HD

i opet meni bolje zvuci dobra pasiva

Izgleda da im je DAC slaba tacka ..."Personally I wish there was a plus version that had better execution on DAC side."......

https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-and-minidsp-2x4-hd-dsp-and-dac.2674/

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Čovek koji je se naslušao Tannoya i kondezatora u njima. Ovo naravno ne mora da važi za druge zvučnike.

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Budget category

Ansar polypropylenes: well made, inexpensive and can be ordered to reasonable tolerances. Highly recommended;

Solen Polyproplynes: As above really, a complete no-brainer and can be ordered to very tight tolerances by request from suppliers such as Jerry at Falcon Acoustics.

Mid Priced:

Claritycap ESA: superb tonality when compared in like-for-like values with other similarly priced capacitors used in the signal path in mid range and HF sections of crossovers. Balanced, clean and whilst some caps lend an air of presence which can border on brightness (which is audible but odd since crossover points haven't altered), the ESA's unoversally seem to be even handed where I've tried them. I cannot recommend these highly enough.

Claritycap MR: Claritycap undertook detailed research into voltage induced plate distortion in crossover capacitors and their meaured results proved rather eye-opening. The MR was specially developed to limit this distortion to a fraction of what other polypropylene capacitors seemingly generated under measurement and has been described as the ultimate crossover capacitor. I have my reservations about this though. They are undoubtedly good, in tests against the ESAs they offered a very slight sonic advantage in clarity and also when used in the signal for mid range units, they seemed to exhibit slightly more body to the sound, but the differences seemed minor. Their biggest drawback is cost. The are almost prohibitively expensive.

Mundorf M-Cap Supreme: I like these almost as much as the Claritycap ESAs. Very similar in many respects. Slightly different plate design with Mundorf making their own claims about why this is the ultimate speaker crossover capacitor. I don't know about that but it shares a similar clarity when used in HF signal path to the Claritycap ESAs, although it is slightly more expensive.

Mundorf M-Cap Evo Oil: A strange one this. Again, a "different" physical construction to just about any other capacitor I tested. They claim a very short, almost "lossless" signal path with ultra-low ESR, combined with exceptional tolerance, but it also has very low equivalent series inductivity (ESL). Of all the capacitors trialled in my Tannoy crossovers, none made such a startling difference (and I use the term advisedly) as this one when used in the notch filter to reign in the audible effects of the 3KHz horn resonance that all MG and HPD tweeter horns suffer from. Quite how a capacitor does this, I'm not at all sure, but it was tested repeatedly with the same audible results...ie a significant improvement in clarity of signal and reduction in audible lift/distortion.

It is also a very good cap to use for the main HF signal path and best of all is that the prices are very reasonable.

One other trick I tried with various caps was to use the solens and other lower cost caps and bypass them with small value Mundorff MCap EVO oils with some good results. This can be rather hit and miss sonically but it is a way to improve linearity with increasing frequency. 

What seems to matter more than the label on the capacitor though is getting the values right.

https://theartofsound.net/forum/showthread.php?28770-Tannoy-Crossovers-Capacitor-testing-and-evaluation/page5

 

I ovaj švajser nije loš. Malo veće špulne od pikavaca:

http://www.jkwynn.co.uk/HPD_HTML/HPD_Thumbs.html

Ali male u odnosu na moje :sarcastic_hand::smesna:

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21 hours ago, damic said:

Izgleda da im je DAC slaba tacka ..."Personally I wish there was a plus version that had better execution on DAC side."......

https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-and-minidsp-2x4-hd-dsp-and-dac.2674/

Zato uzmes kao ja https://www.minidsp.com/products/minidspkits/nanosharc-kit i igras se sa I2S DAC-ovima iza... samo ih menjas kako izadje neki noviji ili bolji ili.......

Ja sam napravio moju plocicu za I2S DAC sa AK4490 i povezao sam preko NanoSHARC-a samo jedan DAC (stereo), naredni koraci su mi da poboljsam napajanja na DAC-u i da vidim sta jos mogu uraditi da se to bolje cuje, potom pravim jos 3 ista takva DAC-a... onda imam sve spremno za cetvorosistemsku aktivu (osim 4 pojacala :) ).

Sam softver za NanoSHARC je veoma jednostavan i mislim da je velika prednost ovakve aktive naspram pasive to sto se skretnica radi u digitalnom domenu, laka su igranja sa uklapanjem drajvera (delay, glasnoca drajvera, rezne frekvencije.....) i lake su izmene DAC-ova ukoliko "sutra" izadje neki kvalitetniji cip...

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