Caps for crossover upgrade for Opera Grand Callas Loudspeakers
The impedance of my loudspeakers had to be very similar to the little sister Opera Callas Diva. Here is their impedance and also other measurements. http://i68.tinypic.com/dqi15z.jpg |
Thanl you Erik, but I only want to change 2 caps: 6,8uF on front tweeter and 10uF on midrange, nothing else. Obviously only if it's possible to remove the Mundorf Evo and put in the same location of crossover the new caps. So you have good experience with Clarity Cap CMR bypassed by a copper caps. Which one? Duelund tinned copper bypass, Audyn Copper Max? Thanks. In what do you prefer CMR Clarity Cap over Duelund and Jupiter? Thanks. |
@erik_squires I don’t understand what you mean about uF quantity and bypass caps. I think that all is proportional, ie a 0,01 bypass caps on 6,8uF has more effect than the same 0,01 bypass caps on 15uF. Am I wrong? You have said that "My experience has been that below 4-5uF I can’t hear any difference in bypassing them." While my logic would be that the more is value of original cap and the less is the effect of a 0,01uF bypass caps. |
A very ineresting cap (sadly quite expensive) is the Lefson c-mod spk. http://www.lefson.com/cmodspk.php I've asked price and measures and they are quite small C-MOD SPK G2 6,8uF/200V - Dimensions = 60x33x32mm - Price : 330€ / each C-MOD SPK G2 10uF/200V - Dimensions = 60x48x32mm - Price : 375€ / each " For your information, all the C-MOD models are actually available and manufactured with the GENERATION 2 technology (major sonic improvement from the first generation) and, for the moment only, sold at the same price than first. LEFSON website and online store will be updated soon." Tell me the vendor. |
Hi, I update the thread. After opening loudspeakers and analyzing the tweeter and mid+woofer crossovers I decide to substitute the following components in series with speakers. Tweeter crossover - Mundorf 6,8uF mcap, anonymous 22uf film cap and ceramic 1ohm resistor respectively substituted with 6,8uF Jupiter VT 100 Aluminium Wax Paper, 22uf Mundorf Supreme Evo Oil and 1ohm Powertron resistor. I have not enough space on the PCB for large 22uf cap, so I decide to go with Mundorf Supreme Evo Oil, good cost/quality ratio and, more important in this case, quite small. Midrange crossover - Mundorf 100uF electrolytic cap, 2,2ohm ceramic resistors substituted with 2 Mundorf 47uF Supreme Evo Oil caps + 6uF Jupiter VT 100 Aluminium Wax Paper and 2,2ohm Powertron resistor. Here the space and cost importance are even more evident, cause a 100uF electrolytic cap is very small and cheap than equivalent film capacitors. The mid crossover has to be made, but I've already done the tweeter crossover changement: much more resolution and information with much less harshness and more natural sound. Ciao. |
Hi, I update the thread, excuse me for being late. Here are the mods done and to be done. Substitution - all components are in series with the speakers Tweeter 1 cap 6,8 uF -> Jupiter VT 100 Aluminium 1 cap 22 uF -> Mundorf Supreme Evo Oil 1 res 1 Ohm -> Powertron FPR2-T218 Metal Foil Resistor 30W Mid 1 cap 100 uF electrolytic -> 47 uF + 47 uF Mundorf Supreme Evo Oil + 6 uF Jupiter VT 100 Aluminium 1 res 2,2 ohm -> Powertron FPR2-T218 Metal Foil Resistor 30W (to be done) add 1 uF bypass cap on 47+47+6=100 uF caps -> Mundorf Supreme Evo Silver Gold Oil Woofer (to be done) add 1 47 uF bypass cap on 3x330=990 uF electrolytic caps -> Mundorf Supreme Evo Oil 2 parallel res 1 ohm -> Powertron FPR2-T218 Metal Foil Resistor 30W As for now I could say the most upgrading mod is sobstituting the 100uF electrolytic cap with the 47+47+6 parallel caps of better quality, the mids now really shines as resolution and thruthfullness. |
