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#21 | |
diyAudio Member
Join Date: Nov 2017
Location: Netherlands
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When you do it, do it right. Go all out. |
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#22 | |
diyAudio Member
Join Date: Nov 2012
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#23 |
Account disabled at member's request
Join Date: Dec 2019
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The Goertz flat foils are better by quite a bit than a standard wire wound and by a bit than a Hepa-Litz. I don't go higher than 1 mH on air core inductors though. I don't know about an actual number assignment but let's give the Goertz 8, 9 or 10 on a scale of 10; Hepa-Litz, 6, 7 or 8 and regular coils 4, 5 or 6. I use the heaviest gauge I can afford if it is in series (for low pass duties) for sure; for high pass, I still use a heavy gauge even if on a tweeter circuit. Not sure if this helps or not. (I don't normally use flat foil in a high pass circuit unless I just happen to have the correct value already on hand)
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#24 |
Account disabled at member's request
Join Date: Dec 2019
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3wayaddict, I am using two per side Vifa/Peerless/Tymphany NE225W-08-HS. These are designed and built very similar to Satori and Illuminator. Some of the best 8 inch (really more like 9 inch) I have heard. I have them sealed; very clean and accurate and they can cross fairly high for a driver this size if need be. I bought the last four pieces in stock; these have been discontinued (I think only the version with the heat sink was discontinued; the other 225's may still be in production as far as I know). Good to know the MR16 mids can meet or beat even high end; I always thought so myself anyway!
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#25 |
Account disabled at member's request
Join Date: Dec 2019
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https://www.madisoundspeakerstore.co...6P-4_Rev-1.pdf
The MR16 I have, 4 Ohm, gray cone https://meniscusaudio.com/wp-content...Data-Sheet.pdf The 13PFC I just received. These are the round frame, 8 Ohm version. They sound REALLY good for anything in this price range; one could be fooled into thinking they cost 2, 3 maybe even 4 times more! The cone "looks" like the Papyrus but has way fewer flecks or specks than the MR16 cone. Perhaps it is a less expensive paper with similar properties to Papyrus? No way do they sound as good as a Satori...BUT, I'm thinking for the money; there may not be a better sounding 5 inch mid-bass!?? |
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#26 |
diyAudio Moderator
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#27 | |
diyAudio Member
Join Date: Oct 2006
Location: San Diego
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2) If you think sound quality and loudness are mutually exclusive, you should check out some of the speakers from JBL, Danley, Bang and Olufsen, etc. To quote Greg Timbers: An Interview with Greg Timbers, Past Designer/Engineer for JBL "I believe that solid Dynamic behavior is most important to get lifelike sound. Dynamics require high efficiency since transducers are pitiful in energy conversion. I also believe that sound staging is extremely important. I think natural midrange and bass presentation precedes the treble range. Of course all things have to be balanced!" Last edited by Patrick Bateman; 21st January 2021 at 09:19 AM. |
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#28 |
Account disabled at member's request
Join Date: Dec 2019
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Well, the sound quality improves so maybe the lower DCR is helping the Q? I haven't done any precision measurements for sure; just based on mostly listening tests. Others besides myself have also made similar statements about these. Again, things like this may not be measurable with home based software, hardware, etc.? I can say for sure though when doing quick A/B comparisons, the sound quality improvement is very real. Why is this exactly? I don't know for sure, lower DCR is always a good thing but there is more to it than just resistance alone.
Goertz CF.56 (14 AWG) Copper Foil Inductor I did a quick search for Alpha Core Goertz and came up empty. I have found some documents in the past though that go into some detail about the superiority of flat foil inductors. I guess this gives me a research project for the day. "Goertz 14 AWG Copper Foil Inductors: 750 Watts; Leads: 0.010 x 0.321 inch, copper; Conductors: 99.99% pure, copper; Dielectric: 0.0015 inch thick, polypropylene film; Inductance Tolerance: +/- 2.5%; and Inductance Reactance: Flat from 5Hz to 50kHz." "High-technology laminating from Alpha-Core/Goertz makes it possible to manufacture inductors from high purity copper foil wound onto a Lexan polycarbonate tube. Foil inductors are mounted by means of a single polycarbonate screw through the central bore, or a silicone elastomer, or a hot-melt adhesive. Foil inductors have obvious advantages over wire-wound inductors in terms of improved electrical and sonic characteristics. This important new development has much to contribute to the design of state-of-the art loudspeaker crossover networks." "Negligible skin effect below 100 kHz which are many orders of magnitude below conventional wire-wound types. High winding tension and vacuum fusing of faces provide. High dimensional stability, effectively locking the conductors in place. Wire-wound inductors, which allow relative motion of conductors due to electromagnetic forces, will exhibit FM distortion by the process of reactance modulation. Flat inductive reactance from 5 Hz to 50 kHz. No saturation distortion due to air-core design. Inductors contain no magnetic materials. Reduced power loss. Highest space factor (ratio of conductor cross area to total cross-section) means lower DC resistance within comparable dimensions. Negligible power loss due to skin-effect. Extremely low stored charge. Cool operation even during prolonged high output power operation. The high space factor and winding density results in improved heat dissipation." The above descriptions are from the Madisound site |
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#29 | |
diyAudio Moderator
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The speaker doesn't change, and the speaker impedance doesn't change when you add series resistance, but the signal feeding the speaker is divided between the resistance and the speaker impedance.
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Some of the issues mentioned can be important. It depends on when and how much, but also whether the comparison is to a component that is deficient to begin with. |
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#30 |
Account disabled at member's request
Join Date: Dec 2019
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Well, I meant added DCR affects the Qt. Yes, this is advertising for sure but what I have seen and read in the past was a third party summary and evaluation; I just can't seem to find it just now.
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