Question about Yamaha Emx5016cf S115v PA System
The capacitor blew and i think of replacing it
The capacitor determines the cutoff frequency of the filter used to either block or pass frequencies above or below the intended design point. Generally, electrolytic capacitors are used for this, due to their capacity for a given size. electrolytic capacitors are manufactured with two foil plates separated by a gauze soaked in electrolyte compound. This electrolyte compound forms a one molecule thick insulation layer. If this electrolyte dries up, the cap will tend to fail, either short or open, usually short. Because the insulation so thn, it is very much affected by the applied voltage (usually DC). Most electrolytic capacitors are used to block DC. these capacitors are usually pretty sensitive to the applied voltage. Most electrolytic capacitors have a WVDC rating, which stands for Woirking Voltage Direct Current. The higher the WVDC rating, the largewr the capacitor for a given capacitance. Also, these capacitors have a very wide tolerance because of this. Typically, this tolerance is +10%/-80%. This rating would indicate that at close to the WVDC rating, the capacitor will be within 10% of its rating. If the capacitor is used in a circuit where the WVDC rating is much higher than the circuit voltage, their will not be enough bias voltage to form the one molecule thick dielectric (insulation) needed for the rated capacitance. So, if the capacitor is rated for 100WVDC and is used in a circuit that only has 40 volts, the effective capacitance will be much lower, and therefor, the crossover frequency would be affected. If the crossover filter is a high pass, then you would risk damage by allowing too much low frequency content to get to the mid/high frequency driver(s). For a low pass configuration, too much high frequency material would get to the woofer, which might affect imaging, but should not damage the driver. Also, electrolytic capacitors come in many varieties. Almost all of them are polarized, meaning that the terminals are marked plus and minus. Capacitors for crossovers are not typically polarized. Here is a link to some non polarized electrolytic caps:
Most audio enthusiasts prefer the sound of polypropylene, polycarbonate or polystyrene capacitors over aluminum electrolytic caps, which also have the advantage of not drying out over time, so they last longer. Also, aluminum electrolytics tend to fail if they do not have a bias voltage applied for a long time. Here is a link to some film cpas for crossovers:
Posted on Oct 31, 2012
Important is to replace old one with the same type .It means if this was MKT type then you should replace it with MKT one.If you use MKP instead of MKT you might get some more information coming from mid/high speaker but in the same time you will get unpleasant sound and you will not enjoy your music any more like before.Not only that ,you will discover that every MKT or MKP capacitor sounds different.I went through this game and I know it...I suggest you buy 4,5 capacitors of the same value but different brands and just find the best sounding one.The same is with electrolytic --- with some you get more loud bass,with other more precision in bass area.I would suggest for MKT/MKP Visaton capacitors - warm sounding and very clear,great resolution and space and not expensive - and electrolytic Visaton, Mundorf or F&T brands
Posted on Jul 30, 2017
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Posted on Jan 02, 2017
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