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<blockquote data-quote="Timo Ulkuniemi" data-source="post: 130707" data-attributes="member: 1978">Re: Behringer iNUKE NU6000 amplifierHelloHome theaters are usually fairly small spaces , when compared to open air festival.What if the room is airtight and woofers are mounted in the walls - like in car stereos ? How much spl would a single 15 with 30mm pp-displacement deliver at 7Hz ?&nbsp; Room size 100m3Why 7Hz, Ivan ?My test oscillator goes down to 4Hz - an old Hewlett Packard - and it is very handy when checking a Marshall cabinet for correct polarity between speakers - or two cabinets - it is quite easy to see if they are right, when observing at 70 degree angle off-axis. It is also very useful when reconing - to check there is nothing extra and assembly moves freely.Definitively there is nothing to hear at 4Hz - what is at 7Hz - three octaves down from A-string on bass guitar... - low thuds in action movies - to warn you, that 236 milliseconds later you will be killed by undescribable horror thing.....</blockquote>

[QUOTE="Timo Ulkuniemi, post: 130707, member: 1978"] Re: Behringer iNUKE NU6000 amplifier Hello Home theaters are usually fairly small spaces , when compared to open air festival. What if the room is airtight and woofers are mounted in the walls - like in car stereos ? How much spl would a single 15 with 30mm pp-displacement deliver at 7Hz ? Room size 100m3 Why 7Hz, Ivan ? My test oscillator goes down to 4Hz - an old Hewlett Packard - and it is very handy when checking a Marshall cabinet for correct polarity between speakers - or two cabinets - it is quite easy to see if they are right, when observing at 70 degree angle off-axis. It is also very useful when reconing - to check there is nothing extra and assembly moves freely. Definitively there is nothing to hear at 4Hz - what is at 7Hz - three octaves down from A-string on bass guitar... - low thuds in action movies - to warn you, that 236 milliseconds later you will be killed by undescribable horror thing..... [/QUOTE]

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