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<blockquote data-quote="TC Sounds" data-source="post: 2726681" data-attributes="member: 572138"><p>Copper lowers the sensitivity, but increases the BL^2/Re thus allowing the driver to work in smaller boxes because the Qts lowers. Generally (not always) the Qts lowers with copper even though the mms raises and SPL lowers. The effects of &quot;smoother transit response&quot; or any claimed “SQ” improvement is purely a function of the difference in Q and/or Fs relative to the system alignment (box size, type and frequency response). Copper does NOT improve “SQ” in the technical aspect of the term. “SQ” is exclusively improved with lower distortion, i.e. linearity via inductance, BL, and/or compliance variation over displacement -those are the three major factors along with linear frequency response which is a function of the driver’s TSP’s and system design. Copper and aluminum are identical in “SQ” respect.&nbsp; Copper also increases thermal handling because it is a slightly better thermal conductor than aluminum. Therefore…If you want to use the driver in a smaller box with more power, choose copper, otherwise choose aluminum. Many home theater subwoofers use copper coils because they have limited box sizes and they indend to maximize the BL product.&nbsp; Copper vc and Aluminum VC drivers carry very different TPS’s therefore it is important to look at both carefully when choosing a driver for a system. Swapping the coil makes enough of a difference to vary your system design substantially.</p></blockquote><p></p>

[QUOTE="TC Sounds, post: 2726681, member: 572138"] Copper lowers the sensitivity, but increases the BL^2/Re thus allowing the driver to work in smaller boxes because the Qts lowers. Generally (not always) the Qts lowers with copper even though the mms raises and SPL lowers. The effects of "smoother transit response" or any claimed “SQ” improvement is purely a function of the difference in Q and/or Fs relative to the system alignment (box size, type and frequency response). Copper does NOT improve “SQ” in the technical aspect of the term. “SQ” is exclusively improved with lower distortion, i.e. linearity via inductance, BL, and/or compliance variation over displacement -those are the three major factors along with linear frequency response which is a function of the driver’s TSP’s and system design. Copper and aluminum are identical in “SQ” respect. Copper also increases thermal handling because it is a slightly better thermal conductor than aluminum. Therefore…If you want to use the driver in a smaller box with more power, choose copper, otherwise choose aluminum. Many home theater subwoofers use copper coils because they have limited box sizes and they indend to maximize the BL product. Copper vc and Aluminum VC drivers carry very different TPS’s therefore it is important to look at both carefully when choosing a driver for a system. Swapping the coil makes enough of a difference to vary your system design substantially. [/QUOTE]

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