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Junior Varsity
configuring 'frankenstack'
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<blockquote data-quote="Douglas R. Allen" data-source="post: 88932" data-attributes="member: 71"><p>Re: configuring 'frankenstack'</p><p></p><p></p><p></p><p>Just to add to this good advice if you don't have a FFT measurement system. Be sure to play the sub alone first with a test tone set at your crossover point . Bring it up to 95 DBs as an example then mute its output. Then play the FH1 midrange alone at 95 dbs with the same tone. Then turn them both on and see what happens. If you don't get around 101 dbs then reverse polarity on the sub and see what happens. If you still don't get 101 dbs then add delay until you get the the lowest output then set the polarity to normal and see again what you get. You should get close to 101 dbs if both are in good phase at the crossover freq. </p><p>After this is done then you can adjust your midranges level to what you need to blend with the subwoofer. With the test tone, reverse polarity for the lowest output method to set delay I always start with both bandpasses running at the same level set one at a time and shoot for as close to a 6db gain as I can get with both bandpass sections turned on. (of course at the spl meter location) </p><p>I had 4 fh1's many years ago. I seem to remember them being about 103db's 1 watt 1 meter depending on freq. Find your subs 1w1m output and turn the fh1 crossover gain down to match your subs output. It could be 6 dbs or more.</p><p>When you match levels as in above you'll get a better idea as to how much you'll need to turn the fh1s down. </p><p></p><p>Douglas R. Allen</p><p></p><p>Edit: Peavey rates them at 104dbs 1w1m </p><p><a href="http://www.peavey.com/assets/literature/manuals/80301013.pdf" target="_blank">http://www.peavey.com/assets/literature/manuals/80301013.pdf</a></p></blockquote><p></p>
[QUOTE="Douglas R. Allen, post: 88932, member: 71"] Re: configuring 'frankenstack' Just to add to this good advice if you don't have a FFT measurement system. Be sure to play the sub alone first with a test tone set at your crossover point . Bring it up to 95 DBs as an example then mute its output. Then play the FH1 midrange alone at 95 dbs with the same tone. Then turn them both on and see what happens. If you don't get around 101 dbs then reverse polarity on the sub and see what happens. If you still don't get 101 dbs then add delay until you get the the lowest output then set the polarity to normal and see again what you get. You should get close to 101 dbs if both are in good phase at the crossover freq. After this is done then you can adjust your midranges level to what you need to blend with the subwoofer. With the test tone, reverse polarity for the lowest output method to set delay I always start with both bandpasses running at the same level set one at a time and shoot for as close to a 6db gain as I can get with both bandpass sections turned on. (of course at the spl meter location) I had 4 fh1's many years ago. I seem to remember them being about 103db's 1 watt 1 meter depending on freq. Find your subs 1w1m output and turn the fh1 crossover gain down to match your subs output. It could be 6 dbs or more. When you match levels as in above you'll get a better idea as to how much you'll need to turn the fh1s down. Douglas R. Allen Edit: Peavey rates them at 104dbs 1w1m [url]http://www.peavey.com/assets/literature/manuals/80301013.pdf[/url] [/QUOTE]
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