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Nad driving kefs
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<blockquote data-quote="Hennie" data-source="post: 9998" data-attributes="member: 20"><p>Nadfan, </p><p></p><p>The impedance difference is too small to explain your observations. My experience with the British is that they tend to overstate sensitivity figures. For example, the Kef Reference 207 is specced at 92dB/W. Being a 4 ohm design, the true sensitivity is closer to 86dB/W.....and that is a much bigger speaker than the IQ5.</p><p></p><p>Being a 5" driver design with plenty baffle step compensation I would expect the IQ5 to be closer to 84 - 85dB/W.</p><p></p><p>The question is why does the PSB seem louder and how can it claim 86dB/W if it is an even smaller satellite design. I am not sure, but it could be that low frequency extension is limited to around 100Hz and no baffle step compensation is applied.</p><p></p><p>For a 85db/W speaker I would recommend about 200W per channel to let it come to life.</p></blockquote><p></p>
[QUOTE="Hennie, post: 9998, member: 20"] Nadfan, The impedance difference is too small to explain your observations. My experience with the British is that they tend to overstate sensitivity figures. For example, the Kef Reference 207 is specced at 92dB/W. Being a 4 ohm design, the true sensitivity is closer to 86dB/W.....and that is a much bigger speaker than the IQ5. Being a 5" driver design with plenty baffle step compensation I would expect the IQ5 to be closer to 84 - 85dB/W. The question is why does the PSB seem louder and how can it claim 86dB/W if it is an even smaller satellite design. I am not sure, but it could be that low frequency extension is limited to around 100Hz and no baffle step compensation is applied. For a 85db/W speaker I would recommend about 200W per channel to let it come to life. [/QUOTE]
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