I noticed the size difference in the voice coil diameter between a 515 and 2225 is big does that make a difference in resolution?
I should have used High definition and efficiency to describe the qualities of Altec Lansing speakers
I noticed the size difference in the voice coil diameter between a 515 and 2225 is big does that make a difference in resolution?
I should have used High definition and efficiency to describe the qualities of Altec Lansing speakers
Last edited by LICORNE; January 31st, 2019 at 05:43 AM.
Resolution is an optical term, in my opinion not usable in audio.
Speaker engineering is way too complex to put into a one line answer, but I'll make an attempt.
The primary advantage of a larger coil is more area to dissipate heat, so higher power handling.
With proper engineering good quality can be achieved regardless of coil size. Some of the best vintage speakers use even smaller coils.
So the quality of the speaker is more important than coil size. Power handling is improved by a larger coil.
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Well, the way I view it assuming resolution = HF BW capability, then to the first approximation the smaller the VC diameter, the wider the driver's pistonic HF BW since VC diameter = 1 WL of highest frequency. Above this point the driver moves into its transmission line [TL modes] BW with the distance from the VC to its effective diaphragm diameter, any doping, SoS through its material governing its mid band/efficiency and above this point is its breakup modes BW, which if well controlled via doping/material 'mix' can add some HF 'snap' to enhance perceived HF transients/'resolution'. The 515 with a usable ~5 kHz BW with a VC that's 'done' by ~1500 Hz is a fine example of this.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
100% valid and good explanation. But I looked up resolution at all the available dictionaries. None applied to speaker bandwidth.
In fact the only audio definition had to do with digital amps.
IMHO if one wants to discuss bandwidth, lets do that.
From my viewpoint, if we want to use resolution applied to speakers, it would be how well a speaker reproduces (resolves) a complex waveform. Not trying to be an arse, but it's confusing to misapply words. Such as the 20 dollar speaker on eBay with an 8 inch "sub" and piezo.
Your neighbors called. They like your music.
I like ^this^ viewpoint.From my viewpoint, if we want to use resolution applied to speakers, it would be how well a speaker reproduces (resolves) a complex waveform. Not trying to be an arse, but it's confusing to misapply words. Such as the 20 dollar speaker on eBay with an 8 inch "sub" and piezo.
FWIW, "Hi-Res" digital format can largely be blamed on Sony. They're pounding an audio sales drum to the beat of "high resolution audio". Seems they want to own the term, perhaps already do.
Hi-Res Audio | High Resolution Audio for Best Sound Quality | Sony US
Not all vegetables make good leaders.
Doesn't articulate already already cover the discription, or would this be more snobspeak?
Sonic Barbarian
Agree and understand and why I clarified what I thought was what he was referring to since thanks to the marketing chaps, 'resolution' is just one of several 'catch-all' terms that DIYers bring to the forums I mostly frequent to describe myriad performance parameters, so much of mine and others time is spent just figuring/finding out just what the @#$% the OP wants performance wise.Originally Posted by Old Guy
GM
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Again, the vast majority of folks that come to the forums haven't a clue how to speak in technical or at least in the correct layman's terms, though 'articulate' is an OK way to describe how accurately the system can reproduce the signal at high speech intelligibility through the telephone BW.Doesn't articulate already already cover the discription, or would this be more snobspeak?
High fidelity/HIFI describes accurate musical reproduction at low distortion.
GM
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True, but this isn't theory, the VC is a pipe and pipe's have well defined acoustic properties same as a musical instrument's, so as I previously posted, any extra HF BW is designed in breakup modes, i.e. frequency modulation distortion, euphonic though it may be to human ears.
Hmm, as one devil's advocate to another, I'll restate it as 'a driver design is a collection of performance trade-offs to meet the needs of the app' since nowadays in many prosound apps the VC/motor design is paramount.
Agreed.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
I do appreciate your explanations GM, I always learn something from them. I think I really started learning about audio when I realized how much I didn't know.
But I think the OP might have walked away with the impression the larger coil will always have less HF response. As I said, loudspeaker engineering can't be reduced to a few sentences, though I have wished many times it could.
Let's postulate an aluminum wire 4 inch coil vs a heavier copper wire 3 inch coil. As you stated, the 4 inch coil is limited by its diameter. But a heavier smaller coil might not be able to reach the point where its diameter becomes a factor due to mass limiting...in this case the smaller coil might have less HF. And of course the rest of the speaker parts...
But yes, certainly, all other things being equal, the smaller coil should have a higher upper BW limit. But I didn't see any such disclaimer in the OP's conclusion.
Your neighbors called. They like your music.
Hi GM I learned to use High definition and efficiency
To describe speaker quality. The 3 inch voice coil vs 4 on Jbl makes a difference and the compliance of the surround dope being best .
Theory and execution are also different animals. While in theory the 4 inch coil should have less upper mid and HF, the old JBL cabinet with I think the 130 and bullet HF sounds better than the Altec duplex 15 inch with the 3000 tweeter. So as a devil's advocate I'm going to state the design is more important than the voice coil size, which is what I stated before.
The Altec 15 only has to go to 3K where the JBL has to go to 5k if I recall. Looked for the specs but couldn't find the system I am referencing, just components. The Altec is the 602, which honestly I don't think is one of Altec's best efforts.
So Licorne, I state again, with good design good sound will be achieved regardless. Don't be too quick with the assumptions. As said many times, a little knowledge is a dangerous thing.
Your neighbors called. They like your music.
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