Passive crossover design |
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Modeller
Registered User Joined: 03 March 2016 Location: UK Status: Offline Points: 31 |
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Thanks.
The speaker was tested from 200Hz, but looking at the signal response it actually rolls in at about 150 (http://www.tymphany.com/peerless/driver-search-results/driver-detail/?id=1079). I was hoping to reinforce and extend that with enclosure design. With a sealed enclosure I would just replicate the tested results. My problem, which I'm all too aware of, is a very limited volume. The audio source is full range, recorded with professional equipment, so the only limitations are the output devices. My thoughts, crazy as they are, would be to use this unit to reproduce frequencies up to somewhere between 500-1000Hz and then roll in a similar but separate driver for up to 20kHz. Don't worry, I know this is insane overkill for what is a scale model, but I'm already pushing boundaries with design so why not audio and electrical performance too? Cheers
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5482 |
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It'll produce sound under 200Hz sure, no driver has a brickwall response. But depending on where its resonance is the excursion under that point for a given power level compared to above it will be large, = dead driver with much less power than its quoted rating. So that all depends on how you plan to drive it. Measure a units impedance over the audio bandwidth to figure out where resonance is. Very easy to do with an external soundcard and one resistor + REW.
As it is rated to perform to 20KHz why do you want to put another tweeter above it? Simple is your friend when designing. Surely if it is just reproducing machine noises anyway the bandwidth required is going to be quite limited. Nothing higher than a few KHz I would imagine? If you must have another driver I am sure there are plenty of small dome HiFi tweeters that would fit the bill. Again you can often go lower than their suggested bandwith, if you are easy with the drive signal. |
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Modeller
Registered User Joined: 03 March 2016 Location: UK Status: Offline Points: 31 |
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Thanks, that's very sound advice.
I'll do some testing when the samples arrive next week. Before I commit to an injection-moulded enclosure I'll be playing with some high density 3D printed prototypes. I've got a couple different designs planned, but I am very open to having one suggested. I'll even send you the prototype unit once it's been tested. A genuine offer for someone with a flair for small design challenges.
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