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<blockquote data-quote="Peter Morris" data-source="post: 141352" data-attributes="member: 652">Re: 60 Degree&nbsp; DIY Mid Hi - They need a name ?Hi Bennett,I have measured them both and they line up quite well with SIM, but that SIM is the power response and is not corrected for directivity, so the SPL response is different.&nbsp; &nbsp;Horn Response will not do an SPL SIM with a ported horn so you have to take you best guess. You can however model the horn without the port which I have done.&nbsp; It is of course missing the LF boost you get from the port. Below are two of the B&amp;C drivers at 1 watt and 1600 watts (800 each).&nbsp; You can see what happens when you start to include directivity … 110 dB 1w @1m.The reason for the difference between the RCF &amp; B&amp;C has nothing to do with quality of the speakers. The response with respect to the driver choice is fundamentally determined by the cone mass and the motor strength and it’s just a matter of finding the best balance to suit this horn.Because I have pushed the design limits and the horn is a little small, the response is not flat. Hence the box was always intended to be used with DSP. When you do this the results are stunning. The measured response with the B&amp;C driver is also shown below.My best guess for the LF horn is nominally 105 dB w/m ... peaking at about 110 dB between 400Hz and 600HzWhen I have some spare time I will try and measure the RCF and B&amp;C in the same enclosure and post the results as you suggested.</blockquote>

[QUOTE="Peter Morris, post: 141352, member: 652"] Re: 60 Degree DIY Mid Hi - They need a name ? Hi Bennett, I have measured them both and they line up quite well with SIM, but that SIM is the power response and is not corrected for directivity, so the SPL response is different. Horn Response will not do an SPL SIM with a ported horn so you have to take you best guess. You can however model the horn without the port which I have done. It is of course missing the LF boost you get from the port. Below are two of the B&C drivers at 1 watt and 1600 watts (800 each). You can see what happens when you start to include directivity … 110 dB 1w @1m. The reason for the difference between the RCF & B&C has nothing to do with quality of the speakers. The response with respect to the driver choice is fundamentally determined by the cone mass and the motor strength and it’s just a matter of finding the best balance to suit this horn. Because I have pushed the design limits and the horn is a little small, the response is not flat. Hence the box was always intended to be used with DSP. When you do this the results are stunning. The measured response with the B&C driver is also shown below.My best guess for the LF horn is nominally 105 dB w/m ... peaking at about 110 dB between 400Hz and 600Hz When I have some spare time I will try and measure the RCF and B&C in the same enclosure and post the results as you suggested. [/QUOTE]

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