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Thread: Voice coil diameter on woofers

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    Senior Hostboard Member LICORNE's Avatar
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    Voice coil diameter on woofers

    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.

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    Voice coil diameter on woofers


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    Re: Voice coil diameter on woofers

    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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    Senior Hostboard Member GM's Avatar
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    Re: Voice coil diameter on woofers

    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.

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    Voice coil diameter on woofers


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    Re: Voice coil diameter on woofers

    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.
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    Re: Voice coil diameter on woofers

    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.
    I like ^this^ viewpoint.

    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
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    Voice coil diameter on woofers


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    Re: Voice coil diameter on woofers

    Doesn't articulate already already cover the discription, or would this be more snobspeak?
    Sonic Barbarian

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    Re: Voice coil diameter on woofers

    Quote Originally Posted by Phil-G View Post
    Doesn't articulate already already cover the discription, or would this be more snobspeak?
    To me "articulate" in a speaker would imply that Bonham's drums are as unique and identifiable as JPJ's bass, or Plant's voice.

    "highly resolving" would imply to me a loudspeaker that will let you clearly identify the timbre and dynamic impact of Bonham's snare being that of a Ludwig, and that the trap/pedal on the bass needed to be lubed prior to the recording of "All of My Love". If you hear and recognize the squeak, it's probably worth mentioning your system's potential to be "resolving".
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    Voice coil diameter on woofers


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    Re: Voice coil diameter on woofers

    i did buy a high resolution ceiling light for the kitchen,,, dang i had no idea how dirty my cabinets were
    Sonic Barbarian

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    Senior Hostboard Member LICORNE's Avatar
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    Re: Voice coil diameter on woofers

    Quote Originally Posted by GM View Post
    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
    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 .

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    Voice coil diameter on woofers


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    Re: Voice coil diameter on woofers

    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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