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Message: <blockquote data-quote="Peter Morris" data-source="post: 141017" data-attributes="member: 652">Re: 60 Degree  DIY Mid HiProbably the most critical part of the horn in this case is its length.The bottom two SIM’s show what happens if we change the throat area of the horn from 300 sq-cm to 400 sq-cm and what happens if we increase its length by 100mm or 4 inches (top)To get the DIY to work in this case I have pushed things to the practical limit. The horn is as small and short as you can get away. To extend the bass response from about 150Hz to 100Hz I added some ports. The cost is some ripples in the frequency response;  because the horn/speakers are all behaving in a linear manner you can fix it with some DSP correction and everything will behave perfectly. It’s only when you try to correct those things that are non-linear that sounds wrong or processed if try too hard.This is the bit that many people don’t understand.  You can describe mathematically a speaker’s behaviour in an electrical type of model. This is what Thiele and Small did. Similarly you can describe the electrical correction the DSP does in the same way.  The net result is the sum of both.  The proviso is the speaker / horn is behaving in a linear manner – i.e. in its piston range where is response is fundamentally determined by the cone area, the strength of the motor, the weight of the cone, and the spring and dampening force of the suspension.In the case of the DIY all the drivers are in their piston range. There are a few minor issues within the compression driver where the HF and VHF have to combine, but these are much less than having separated drivers trying to cover the required frequency range. It also results in much less size and weight.You asked about putting the HF horn within the walls of the box. One possible issue is the edge of the box causing HF reflections or diffraction issues.  At some point the discontinuity between width of the throat entrance and the width of the start of the horn may be an issue … not exactly sure where this will become significant. The obvious other issue is size and weight.  </blockquote>

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