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<blockquote data-quote="Electrodynamic" data-source="post: 7141629" data-attributes="member: 548723">Due to the nature of the aforementioned statement about me not being able to safely say that foam is more compliant than rubber I made the latter post. Now you’re asking if compliance and sensitivity stay the same with two wildly different surround materials and thicknesses can you not compare the two? Yes you can compare them. My response was to someone nit-picking what I wrote about compliances between the two materials. Doing what you asked about is extremely difficult and has a high probability of negatively impacting the design goals of the driver (one may be wider than another, have a different profile, etc, all of which affect the compliance curve, not just the overall Cms figure). It can be done, but it&#039;s difficult to do, which is what I said in my previous post. Some times it is imperative to use foam or a soft cloth (depending on the application and design needs) to obtain a certain compliance which rubber cannot be made thin enough without impacting the durability of the surround. Of course you can change your spider weave or material or both to combat the surround compliance, but it&#039;s a mix (remember when I said &quot;balancing act&quot;?) of the two that shapes the overall compliance curve and gives you the overall compliance of the driver. A lot of the time it&#039;s just easier to select a surround based on what you need.Yes. Different foams affect the compliance even if the thickness stays the same (which goes for rubber as well).</blockquote>

[QUOTE="Electrodynamic, post: 7141629, member: 548723"] Due to the nature of the aforementioned statement about me not being able to safely say that foam is more compliant than rubber I made the latter post. Now you’re asking if compliance and sensitivity stay the same with two wildly different surround materials and thicknesses can you not compare the two? Yes you can compare them. My response was to someone nit-picking what I wrote about compliances between the two materials. Doing what you asked about is extremely difficult and has a high probability of negatively impacting the design goals of the driver (one may be wider than another, have a different profile, etc, all of which affect the compliance curve, not just the overall Cms figure). It can be done, but it's difficult to do, which is what I said in my previous post. Some times it is imperative to use foam or a soft cloth (depending on the application and design needs) to obtain a certain compliance which rubber cannot be made thin enough without impacting the durability of the surround. Of course you can change your spider weave or material or both to combat the surround compliance, but it's a mix (remember when I said "balancing act"?) of the two that shapes the overall compliance curve and gives you the overall compliance of the driver. A lot of the time it's just easier to select a surround based on what you need. Yes. Different foams affect the compliance even if the thickness stays the same (which goes for rubber as well). [/QUOTE]

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