Erse Inductors
Comments
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Reviving this thread again. Been chatting about inductors on another thread, as I've put the Erse's into my 1C's. Re-reading the quote from MP:From Matt,
"...However, because of the DC resistance of the inductor, the system isn't perfect. I don't recall the DC resistance of these coils but it was high, at least several ohms depending on the model. This means that the SDA drivers will continue to produce some SDA signal even at very low frequencies. Decreasing the DC resistance will definitely improve the bass response of the system both qualitatively and quantitatively. However, before you rush out to buy those Hi-Q replacement inductors be aware of some concerns.
"We chose the higher DC air core coils for a couple of good reasons. First, we were always on the edge of acceptability with the impedance of the SDA's. The DCR of these coils kept the minimum impedance high enough for the amps available in those days. Depending on the model, reducing the DC resistance of these coils may take the minimum impedance down to around 2 ohms. If your amp doesn't mind, you shouldn't either. The other concern is saturation of the inductor core. Air core inductors don't saturate. Given the cost of adequate ferrite or laminated core inductors at the time, plus the need for a higher DCR, the air core choice was obvious. So, when switching to a ferrite or laminated core inductor make sure it will handle at least 5 amps without saturation. That's equivalent to 100 watts of low frequency power through the SDA driver."
My interpretation of this is that the lower DCR iron core would definitely be beneficial to the SDA's, but for two concerns: 1) Can your amp handle lower impedance speakers, possibly as low as 2 ohms, and 2) Will the iron core inductor saturate?
In my case, I'm landing a Krell amp this weekend which will happily put out 1000W into 2 ohms! Nice!!! As for the saturation, while this isn't a spec, PartsExpress does say this about the Erse:
"Finally, a sonically superior magnetic core coil! The Super Q line features a specially shaped core that allows for optimal magnetic performance and increases the coil's effective permeability. The result is extremely low DC resistance, reduced distortion and very high saturation levels. The coils are encapsulated in a plastic housing, which eliminates any magneto striction distortion and makes mounting a breeze. The 500 watt power rating makes these coils perfect for high power prosound applications."
As I've mentioned earlier in this thread, my SDA's are in a very (too...) small room, so I don't need to push them very hard. I'm certain I won't be putting 500 watts through these inductors, or I won't have walls in the room any more! From a sonic standpoint I'm very pleased with what they do, so they're keepers.;)Good music, a good source, and good power can make SDA's sing. Tubes make them dance. -
In normal usage your not likely to reach that coils saturation point.If your Krell is comfy with the low impedance then you are likely to gain some tightness and control in the bass because of the better damping resulting from the lowered DCR.Testing
Testing
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In normal usage your not likely to reach that coils saturation point.If your Krell is comfy with the low impedance then you are likely to gain some tightness and control in the bass because of the better damping resulting from the lowered DCR.
Yes.Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
Thanks
Ben -
Which thread may I ask?Been chatting about inductors on another thread, as I've put the Erse's into my 1C's.Testing
Testing
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Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
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Can someone clarify how an inductor's lower DCR will lower the system's minimum impedance?We chose the higher DC air core coils for a couple of good reasons. First, we were always on the edge of acceptability with the impedance of the SDA's. The DCR of these coils kept the minimum impedance high enough for the amps available in those days."He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche -
You're misreading. What he's saying is that the higher DCR of the air-core inductor kept the overall minimum impedance higher, to suit the amps of the day. By lowering the DCR by using the iron core, any amp being used must be ok to use with lower impedance speakers.Good music, a good source, and good power can make SDA's sing. Tubes make them dance.
