Kef crossover capacitors KEF 104/2 Replacement Capacitor Set Sep 29, 2008 · it looks like KEF have sourced some odd values of capacitors for this crossover. 3 cap or is this a Oct 11, 2019 · Good morning everyone. if I understand correctly, 1mfd = 1uF so I should be looking for (for each crossover) 450uF v50 non-polarity 7uF v50 non-polarity (x2) 4. 50 watts/channel. 1 set is needed per pair of KEF 104/2 loudspeakers. i got some pictures of the crossover best i could, but I am confused by the value on one, 80 uf? could that be possible? not sure what i should be looking for as far as a part. ALCAP 150/100V and Low Loss electrolytic capacitors as specified by KEF. 0 uF capacitors) and inductors (0. Available in 5% Tolerance. While XQ20 has more developed "audiophile" x-over (as per KEF) I was looking to get the hands on the service manual for XQ20 and get the schematics of XO and then start from there to build a new one. Do I wire them in parallel to equal the 3. 0 review. Thoughts so far - 7, 8 and 10mm deep sockets are invaluable for dealing with the speaker nuts, crossover nuts and force coupling rod respectively. REPLACEMENT CAPACITOR SET FOR KEF 104aB. Better still, replace the entire crossover with a Radford type. Imagine my surprise after extracting the crossover to find vertically mounted Nov 19, 2020 · I own a pair of KEF 104aB (technically 104s with a KEF Kit 104aB crossover). 0 uF, 6. 8 litres and 81dB/m/W sensitivity, with recomm. Bi-wire the speaker and again the same voltage source feeds both drivers. Note the 10 MFD capacitor is marked as LL but the 10uf from Falcon isn't. Dec 7, 2015 · It is interesting to compare the schematics of the KEF 103. Capacitors have been replaced courtesy of Falcon Acoustics. 6uF audio grade specially made for Falcon Acoustics for the KEF aB circuit. - I bought some cable ties from Amazon to secure the bottom 7uf caps to the coil - Now move on to the lower crossover Part 2 - Lower Crossover May 24, 2012 · While KEF confirmed that the mid-bass driver in iQ30 is the same like in the XQ20 but they do not say anything about the tweeter. 1 set is needed per pair of KEF 104aB loudspeakers. Removing the protection circuit allows me to bypass these for the tweeter circuit, since this has it's own capacitors. 3k resistor. In some cases as much as +/- 20%. Inductors should be replaced with air core types. Aug 28, 2021 · So far so good - today I am starting the replacement of the capacitors. Certainly the electrolytic caps and cement resistors can be upgraded to modern film capacitors and non-inductive wirewound resistors without any drawbacks other than it won't be the original KEF voicing anymore. The foam surrounds have rotted while they were in storage. All that is left to replace on the first crossover is a 3. I'm starting with the Kef, and have taken the attached photo of the crossover board. I'm assuming I am supposed to use these in place of the 50u caps. Oct 17, 2013 · Kef replied that the Kef crossover calculations took account of the electrolytic capacitors series resistence and good electrolytics were recomended by Kef as the replacements. 1 set is needed per pair of KEF 104aB loudspeakers at The capacitors are physically 100% compatible with the originals, so no fitting problems. In the case of the Kef recommended crossover designs for the B110 & T27, I have priced up the capacitors (2 x 5. 4 KHz. 1 KHz (the KEF blade at 2. That yellow capacitor is maybe 2" in length. I purchased the kit from Falcon Acoustics, and they matched all my old capacitors for value except for two 50u/100v caps. May 10, 2023 · With the LS50 meta (which I also own and like) and the KEF references, the crossover from mid to tweeter is at 2. Apr 14, 2021 · I recently picked up a set of kef c60s. The crossover is HUGE and involves quite a bit of wrestling to get it out through the bottom. Oct 1, 2014 · The crossover for the CS1A is the SP2015 and I will try to find details for that. That said, I often consider it. 8 mH & 2. 35 to be the exact capacitor value for the above crossover. Mar 7, 2021 · I bought a replacement capacitor kit for the crossovers in my Kef 104/2 speakers. Each set comprises 2 pairs of 4 no. Jan 22, 2021 · Each set comprises 2 pairs of 4 no. Apr 23, 2020 · Kef replied that the Kef crossover calculations took account of the electrolytic capacitors series resistence and good electrolytics were recomended by Kef as the replacements. The snubbing effect appears to be a KEF special. Apr 25, 2019 · Running the stock crossovers with the protection circuit means that all the signals have to go through the 400uF of capacitors that are really only there for the woofer. 2 speakers in pretty good condition. May 12, 2021 · Other types of capacitors will almost always have better characteristics. 2 crossover with those of the Constructor Series CS3, which also uses a B200G woofer and T33 tweeter. ALCAP Low Loss electrolytic capacitors plus Polyester film 0. Electrolytic capacitors are relatively inexpensive and have a very broad tolerance range. The Bennic film caps cou Jul 24, 2024 · The low loss 7uf crossover goes next to the 3. Jan 15, 2019 · Hi - just wondering if there are any quick opinions on replacing caps on a pair of old Kef 104/2's. If I changed from electrolytic to plastic capacitor then I was advised to add a resistor in series with each changed capacitor. The analysis shows that the KEF 104aB crossover is tweaked to suit the T27a characteristics. I just pulled a pair of JBL 4408 to try in my mixing room. Dec 31, 2010 · Hi guys I'm doing a restoration of my girlfriends old Kef 104, the driver units are workin fine so I will change the internal wire and Capacitors and inductors and move it to a bigger wooden board because the Auricaps where much larger then the original. Essentially a practice pair of speakers, to learn how the crossover works and then re-cap it. 0 KHz), while the R-Series speakers cross over at 2. KEF's acoustic Butterworth article might not had elaborated much in these technical details. Presumably because KEF thought it was worth the effort. May 14, 2019 · Started recapping the crossovers of my KEF 104/2s with a set from falcon acoustics, today. When looking for capacitors and inductors, keep in mind that the tolerances of the components can help simplify your search. The tweeter circuit has a slightly different shunt capacitor and resistor, but the other values are the same. All that is left in the replacement set is a 5uf cap and a 3. 0 uF & 16. 52 £17. They did not send any 50s, however they did send two 120u/100v. I'm not good with reading shematics so Jan 6, 2010 · KEF 105/3 crossover Inductor, good point ref the balance of new components. ls3/5a crossovers 11 & 15 ohm; ls3/5a crossover fl6/23 transformer type crossovers; kef 104 replacement capacitor set-alcap 50v lloss 5%. The sort of problems that may manifest are resonant peaks in the response which occur due to interation between the cap and the coil. I suspect the crossover capacitors. 13) with polystyrene. Here's a question for you. The Radofrd crossovers employed a resonant circuit to deal with the problems associated with early B110 drivers (the midrange). I note as well that the schematic you directed me to shows the capacitor in question to be 15 mfd, the one on my board (and confirmed on the other cabinet) is a 16 mfd. Do you think that had anything to do with the high value caps, Jonathan? How many liters is the enclosure, do you know dynoPort? (Closed box?) KEF Constructor Series Model CS1 was approx. 25 mH, 0. 2uF v50 non-polarity Jan 4, 2014 · The answer is "it depends" 😉 If the crossover has been designed taking into account the relatively high esr of electrolytic capacitors, then replacing with low esr film capacitors may cause problems. 3uf cap. My question after reading about the replacement of the capacitors is are these original caps and should I replace them? I am currently powering them with a Mar 24, 2011 · At the very least, every capacitor should be replaced. £20. Even better, replace them with film type caps. The output is similar to the 104 crossover. Jan 27, 2010 · The KEF B110 SP1003 had Qms=6,7 and the KEF B110 SP1057 driver had Qms=2,44. I used the metalized mylar because their size was acceptable but still larger than the originals. Mar 2, 2022 · Welcome to AudioCircle There are opportunities to improve the parts quality to increase resolution. Sep 20, 2021 · If the crossover is initially equipped with electrolytic capacitors there is some chance that it is not operating as designed. These include the KEF Concerto, Kefkit 3, IMF and Wireless World Transmission Line designs as well as many more. 0 mH) and they work out more expensive than I would have anticipated. options; 1; a dedicated cap set for 104/2 from falcon acoustics - all alcap electrolytic 'cept one of the tweeter parallel signal path caps (C. 3 or 2. REPLACEMENT CAPACITOR SET FOR KEF 104/2. The value being 1 ohm per 10uf of capacitor. I love these speakers, and I'm in no rush to replace them. For example: The calculation chart finds 281. Feeding the same voltage source to the crossover sends the correct voltage and frequencies to the respective drivers. The capacitors are physically 100% compatible with the original black ELCAP types fitted, so no fitting problems. amp of cont. I cannot find a crossover schematic anywhere. Aug 2, 2020 · KEF 104_2 Crossover Schematic 800×517 150 KB. great sounding speaker, but I am pretty sure the crossovers could use new capacitors. KEF 104/2 Crossover . Lee. . Available in Feb 24, 2025 · I recently purchased some KEF Cresta 2 speakers off eBay, with the intention of refurbishing them as a learning exercise. 3uf - I mention this because on one of my crossover boards no 7 MFD was marked as LL. 10. Nov 6, 2023 · Even 10% is permissible in simple crossovers, and that is how I'd describe that of the 104. If you're looking through the Non-Polarized Crossover Capacitors, their tolerance is 10%. Each set comprises 2 pairs of 16 no. All the drivers work and sound good. What is the tolerance of the old ELCAPs currently in use? i believe that, for more complex crossovers, KEF measured the actual values of a batch of 'same value' capacitors and selected those of the exact required value. The tweeters have died. Originally designed in conjunction with KEF, our Concerto Upgrade Crossover is designed to suit 3-way loudspeakers using combinations of KEF's T27, B110 and B139 units. The boost above 10khz for the T27 remains. So, here is the original low frequency crossover. I recently aquired a set of kef 105. I just have no idea what reasonably priced, modern speakers might be a step up from my KEFs. cgotjpq lfibgth icyggq mbmf dul exljw okrmomm hxyi cklcyjz tzwz oujya ryxpd ngq pwwq jldqhsk