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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="Papermaker85" data-source="post: 3741719" data-attributes="member: 572595"><p>B is the density of the magnetic field...</p><p></p><p>l is simply the length of the coil in that field...</p><p></p><p>flux density*length of coil will tell you how much "power" the motor has in very simple terms...</p><p></p><p>power handling, suspensions the box needed/used and enviroment are equally as important in both output and SQ..efficiency is also very important, but not the 1w1m spec youf often see..</p><p></p><p>The higher/lower B/l means with a given input will determine its electrical dampning or how the woofers reacts to the signal(measured @ resonance)...</p><p></p><p>i really won't add much to what has been said because it covers a good spread of information but if more questions arise ill be glad to help..</p><p></p><p>i will state the main differences of SPL woofers and SQ woofers...</p><p></p><p>SPL first then SQ</p><p></p><p>Suspension... many high output woofers have very stiff suspensions... this allows you to lower the Q of your port causing its efficiency to be very high and it to be VERY peaky.. its also many times they are not very linear becasue suspension failure from over excursion becomes very easy at high output levels, and cone control is CRUTICAL to efficiency(output)..</p><p></p><p>in SQ woofers you often see much "softer" suspension simpy because of back pressure.. this corrlates to a higher QMS and lower FS.. don't get confused though having a high FS or low QMS doesn't mean the woofer will sound bad, its simply a matter of what you want to accomplish. But many cases it does help to have such traits, as its proven that a shallower roll off and lower FS have lower group delay.</p><p></p><p>motors... many motors are very large and have huge top/back plates... this serves a few purposes...</p><p></p><p>1 absorb heat from the coil</p><p></p><p>2 provide the proper motor strength for the excursion levels and compression levels(Bl)...</p><p></p><p>3 provide the proper dampning for the aligment(QES)</p><p></p><p>is SQ woofers BL isn't as high because higher BL woofers suffer by increasing the affects of inductance/back EMF and the cone is much more controlled by the sealed box. output isn't much of a concern as 12-16mm xmax is enought to reach 120 DB in most applications this helps keep mass lower(shorter gap height/coil height).</p><p></p><p>high BL isn't bad and it doesn't directly corrulate to a "poor sounding" woofer. it needs to be noted that higher B/L woofers have more weight(MMS MMD) or can have more output potential.. fact of the matter is though the higer the B/l the more potential output, bare none and SQ woofers aren't designed for output...</p><p></p><p>now when your designing a woofer that sounds good and gets loud things bomce alot more difficult, but that information is gonna cost you a leg....</p></blockquote><p></p>
[QUOTE="Papermaker85, post: 3741719, member: 572595"] B is the density of the magnetic field... l is simply the length of the coil in that field... flux density*length of coil will tell you how much "power" the motor has in very simple terms... power handling, suspensions the box needed/used and enviroment are equally as important in both output and SQ..efficiency is also very important, but not the 1w1m spec youf often see.. The higher/lower B/l means with a given input will determine its electrical dampning or how the woofers reacts to the signal(measured @ resonance)... i really won't add much to what has been said because it covers a good spread of information but if more questions arise ill be glad to help.. i will state the main differences of SPL woofers and SQ woofers... SPL first then SQ Suspension... many high output woofers have very stiff suspensions... this allows you to lower the Q of your port causing its efficiency to be very high and it to be VERY peaky.. its also many times they are not very linear becasue suspension failure from over excursion becomes very easy at high output levels, and cone control is CRUTICAL to efficiency(output).. in SQ woofers you often see much "softer" suspension simpy because of back pressure.. this corrlates to a higher QMS and lower FS.. don't get confused though having a high FS or low QMS doesn't mean the woofer will sound bad, its simply a matter of what you want to accomplish. But many cases it does help to have such traits, as its proven that a shallower roll off and lower FS have lower group delay. motors... many motors are very large and have huge top/back plates... this serves a few purposes... 1 absorb heat from the coil 2 provide the proper motor strength for the excursion levels and compression levels(Bl)... 3 provide the proper dampning for the aligment(QES) is SQ woofers BL isn't as high because higher BL woofers suffer by increasing the affects of inductance/back EMF and the cone is much more controlled by the sealed box. output isn't much of a concern as 12-16mm xmax is enought to reach 120 DB in most applications this helps keep mass lower(shorter gap height/coil height). high BL isn't bad and it doesn't directly corrulate to a "poor sounding" woofer. it needs to be noted that higher B/L woofers have more weight(MMS MMD) or can have more output potential.. fact of the matter is though the higer the B/l the more potential output, bare none and SQ woofers aren't designed for output... now when your designing a woofer that sounds good and gets loud things bomce alot more difficult, but that information is gonna cost you a leg.... [/QUOTE]
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What's the difference between a true SPL sub and a true SQ sub?
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