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What's the difference between a true SPL sub and a true SQ sub?
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<blockquote data-quote="Electrodynamic" data-source="post: 3725843" data-attributes="member: 548723"><p>There are many different ideologies in respect to what makes a SQ or SPL sub. There have even been companies that have experimented with different parameters (one in particular made a sub with a low Fs as a goal because they peak higher in enclosure simulation programs) trying to come up with what exactly defines an SQ and a SPL sub. For demonstration purposes, lets explore the different ideologies of an SPL sub:</p><p></p><p>High BL = SPL sub. This <em>can</em> be true. Higher BL means the motor has more force and control over the moving assembly at a certain point (there are high BL subs that have a very non-linear BL curve so the BL is focused within a few mm of travel and beyond that range the BL drops drastically). The main goal is to have enough BL to reach full excursion at a given frequency with a given amount of power. But high BL doesn't mean it will get louder instantly compared to lower BL subwoofers (take the older Brahma's - Scotty Johnson used them and whipped arse...BL was ~14 I believe).</p><p></p><p>A lot of the time higher BL subwoofers have lower Qts's, which lend them to like ported enclosures (once again, more SPL oriented). However, this doesn't mean that they can't sound good in the proper alignment (enclosure type and size).</p><p></p><p>Low Fs, high Qts = SQ sub. Not necessarily always, but can be true in some instances. Low Fs subwoofers can be coined as sealed-box woofers, which can be true dependent upon other T/S's. Same goes for High Qts. High Qts's vs low Qts's can tilt the tables significantly either way. A lot of the time lower Qts drivers are more driven towards ported enclosures (as stated above) so they're louder than their sealed counterparts (3 dB gain when porting). Hence the "SPL" label.</p><p></p><p>It's all about the goal of the subwoofer though. Target enclosure volumes with a target F3 in those specified volumes and power handling are the three biggies when designing a subwoofer. There are a lot of other factors too (I am very anal - yes I said anal //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif - about soft part selection and how it affects the overall sound of the woofer along with how the motor is designed for linearity, BL, size, etc).</p><p></p><p>But anyway...instead of de-railing massively, which I've just done, if you have two woofers: woofer A has a BL of 30 and a Qts of .19 with an Fs of 35 Hz and woofer B has a BL of 19 and a Qts of .40 with an Fs of 28 Hz, woofer A will be your SPL option and woofer B will be your SQ option. But keep in mind that was a HUGE generalization. <strong>HUGE</strong> generalization.</p></blockquote><p></p>
[QUOTE="Electrodynamic, post: 3725843, member: 548723"] There are many different ideologies in respect to what makes a SQ or SPL sub. There have even been companies that have experimented with different parameters (one in particular made a sub with a low Fs as a goal because they peak higher in enclosure simulation programs) trying to come up with what exactly defines an SQ and a SPL sub. For demonstration purposes, lets explore the different ideologies of an SPL sub: High BL = SPL sub. This [I]can[/I] be true. Higher BL means the motor has more force and control over the moving assembly at a certain point (there are high BL subs that have a very non-linear BL curve so the BL is focused within a few mm of travel and beyond that range the BL drops drastically). The main goal is to have enough BL to reach full excursion at a given frequency with a given amount of power. But high BL doesn't mean it will get louder instantly compared to lower BL subwoofers (take the older Brahma's - Scotty Johnson used them and whipped arse...BL was ~14 I believe). A lot of the time higher BL subwoofers have lower Qts's, which lend them to like ported enclosures (once again, more SPL oriented). However, this doesn't mean that they can't sound good in the proper alignment (enclosure type and size). Low Fs, high Qts = SQ sub. Not necessarily always, but can be true in some instances. Low Fs subwoofers can be coined as sealed-box woofers, which can be true dependent upon other T/S's. Same goes for High Qts. High Qts's vs low Qts's can tilt the tables significantly either way. A lot of the time lower Qts drivers are more driven towards ported enclosures (as stated above) so they're louder than their sealed counterparts (3 dB gain when porting). Hence the "SPL" label. It's all about the goal of the subwoofer though. Target enclosure volumes with a target F3 in those specified volumes and power handling are the three biggies when designing a subwoofer. There are a lot of other factors too (I am very anal - yes I said anal [IMG]//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif[/IMG] - about soft part selection and how it affects the overall sound of the woofer along with how the motor is designed for linearity, BL, size, etc). But anyway...instead of de-railing massively, which I've just done, if you have two woofers: woofer A has a BL of 30 and a Qts of .19 with an Fs of 35 Hz and woofer B has a BL of 19 and a Qts of .40 with an Fs of 28 Hz, woofer A will be your SPL option and woofer B will be your SQ option. But keep in mind that was a HUGE generalization. [B]HUGE[/B] generalization. [/QUOTE]
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What's the difference between a true SPL sub and a true SQ sub?
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