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<blockquote data-quote="Riley Casey" data-source="post: 3865" data-attributes="member: 125"><p>I acquired a number of Meyer UPM speakers a while back and started to use them recently.&nbsp; I was aware that they require a processor as designed by Meyer and as I often do with such things I decided that I could get in the ballpark by making a transfer function measurement and building an EQ to fit.&nbsp; I was more than a bit surprised at the response of the raw boxes, particularly the large hole centered around 3.5 kHz.&nbsp; This strikes me as more than a bit strange for a box with a pair of 5&quot; drivers and piezo tweeter.&nbsp; I gather that the passive network in the UPM low passes one of the low drivers so that only one is working at the mid band and that the piezo is probably crossed in fairly high, say around 7 kHz or higher.&nbsp; This only compounds my surprise at the raw response.&nbsp; Anyone here a UPM maven, has anyone ever run a measurement on the UPM processor?&nbsp; Very curious at this point.&nbsp; These are very handy boxes from a form factor perspective but they sure require a lot of unusual EQ.&nbsp; I&#039;ve posted a screen shot of the average of six UPMs ( yellow trace ) measured at 4 ft along with a Galaxy Hotspot ( orange trace ) as a comparison since it has a pair of similar sized drivers.</p></blockquote><p></p>

[QUOTE="Riley Casey, post: 3865, member: 125"] I acquired a number of Meyer UPM speakers a while back and started to use them recently. I was aware that they require a processor as designed by Meyer and as I often do with such things I decided that I could get in the ballpark by making a transfer function measurement and building an EQ to fit. I was more than a bit surprised at the response of the raw boxes, particularly the large hole centered around 3.5 kHz. This strikes me as more than a bit strange for a box with a pair of 5" drivers and piezo tweeter. I gather that the passive network in the UPM low passes one of the low drivers so that only one is working at the mid band and that the piezo is probably crossed in fairly high, say around 7 kHz or higher. This only compounds my surprise at the raw response. Anyone here a UPM maven, has anyone ever run a measurement on the UPM processor? Very curious at this point. These are very handy boxes from a form factor perspective but they sure require a lot of unusual EQ. I've posted a screen shot of the average of six UPMs ( yellow trace ) measured at 4 ft along with a Galaxy Hotspot ( orange trace ) as a comparison since it has a pair of similar sized drivers. [/QUOTE]

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