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<blockquote data-quote="Art Welter" data-source="post: 76057" data-attributes="member: 52">Re: Horn theory questionsGetting 100 Hz out of a &quot;full range&quot; compression driver is possible with a very&nbsp; large horn, but LF level is very limited due to the very small linear range (Xmax) and (relatively) small diaphragm diameter.In this thread:<a href="http://www.diyaudio.com/forums/multi-way/208799-western-electric-1928-how-far-have-we-come-last-100-years-101.html" target="_blank">Western Electric 1928 - How far have we come in the last 100 years? - Page 101 - diyAudio</a>Post #1010 Speaker Dave posts some W.E. response curves.A single large horn using a W.E. 555 will not be flat on axis in an outdoor or anechoic environment.As you can see, the on axis outdoor response is over 40 dB down at 100 Hz compared to the 1-4K range.That kind of response, with it&#039;s narrowing upper on axis response, can combine to a fairly flat response with multiple units covering various theater locations.The 555 LF output potential will still not approach that of a cone driver, as the 555 diaphragm displacement is a fraction of even an &quot;old school&quot; 10&quot; or 12&quot; driver as mentioned in posts # 1 and 3 above.</blockquote>

[QUOTE="Art Welter, post: 76057, member: 52"] Re: Horn theory questions Getting 100 Hz out of a "full range" compression driver is possible with a very large horn, but LF level is very limited due to the very small linear range (Xmax) and (relatively) small diaphragm diameter. In this thread: [url=http://www.diyaudio.com/forums/multi-way/208799-western-electric-1928-how-far-have-we-come-last-100-years-101.html]Western Electric 1928 - How far have we come in the last 100 years? - Page 101 - diyAudio[/url] Post #1010 Speaker Dave posts some W.E. response curves. A single large horn using a W.E. 555 will not be flat on axis in an outdoor or anechoic environment. As you can see, the on axis outdoor response is over 40 dB down at 100 Hz compared to the 1-4K range. That kind of response, with it's narrowing upper on axis response, can combine to a fairly flat response with multiple units covering various theater locations. The 555 LF output potential will still not approach that of a cone driver, as the 555 diaphragm displacement is a fraction of even an "old school" 10" or 12" driver as mentioned in posts # 1 and 3 above. [/QUOTE]

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