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Old 6th October 2013, 04:35 PM   #71
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Have two in each, double the fun!
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Old 6th October 2013, 05:02 PM   #72
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Re the above, everything. Leaving aside that you'd have a radically different loading on the drivers, the internal configuration would need to be changed, which would in turn alter the load & behaviour further since the physical shape of the FH enclosure[s] are functional parts of the design, and you will have completely departed from that too. You would then need to consider the difference in the power-response & tuning and make alterations based on that. And then... (you get the idea).
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Old 6th October 2013, 05:12 PM   #73
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Whilst in the land of silly. Would an inverted FH sound that much different, in terms of what's emitted from the cone? If not, and I can't think of a scientific reason why not, wouldn't two mirrored FH each driven by its own amp be a viable arrangement?
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Old 6th October 2013, 06:35 PM   #74
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Quote:
Originally Posted by lorienblack View Post
wouldn't two mirrored FH each driven by its own amp be a viable arrangement?
I'ved posted a Sketch of that concept somewhere here.

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Old 6th October 2013, 09:58 PM   #75
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If you had two drivers you could low pass one of them to provide bass extension and avoid lobing by ensuring the low pass cross-over is set appropriately - just a guess, it's a foreign concept to me.

Anyhow, I'd prefer a single driver in a pair of siamesed FH's. I'd keep the tuned lengths the same but halve the cross-sectional areas. This should be pretty close to the right alignment. What was your proposal Dave ?
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Old 6th October 2013, 10:11 PM   #76
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What was your proposal Dave ?
Siameasing 2 FH3 (with 2 drivers). If i only wanted 1 driver i'd build Maeshowe (we have) or Valiant.

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Old 7th October 2013, 12:57 AM   #77
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But the FH3 is quite a different horn than the Maeshowe. The Maeshow is a hyperbolic expansion. The FH3 is a tapped hypex with a low pass choke point. I know there are many similarities, but they are not the same.
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Old 7th October 2013, 12:45 PM   #78
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Quite. Which is why Dave didn't recommend it. The Siamesed FH3 concept with multiple drivers has problems enough, let alone fooling around trying to combine things.

If you're using 1 driver you can't just mirror a couple of FH3 cabinets then hack the CSA & expect it to work properly. The dimensions & physical size / shape of the cabinet (as I regularly point out) are functional parts of the design. If you depart from them, you're in technical terms 'stuffed' unless you know what it is you are doing. Which basically means a new design. Is this desired? And if so, how would people prefer it to be made available?

The truth is that if you want the highest performing back-horn I can manage in design terms within reasonable size / cost / complexity constraints for the A7 / CHR / CHP, it's Maeshowe. That's why it's on the site in question (it wouldn't be on it if it wasn't), & why a small charge is made, so, like Bob with his MLTLs, Dave who hosts the site & draws the pdfs & I get to cover our costs. If something like what you are talking about is demanded, fair enough: I'll do it. I can say, because I looked at just such a cabinet about two years back, performance will take a hit compared to Maeshowe. It'll be as good as I can manage with the load in question, but by nature it won't be of quite the same level. Depends on where the priorities lie -performance or (relative) physical simplicity. Sadly, you can't acoustically speaking get something for nothing.

Last edited by Scottmoose; 7th October 2013 at 01:00 PM.
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Old 7th October 2013, 02:28 PM   #79
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Once I commit to sawing wood it isn't such a big deal to go a little more complex if there are real performance gains to be made. I am curious why you developed these double mouthed BLH (here we go off topic again) since I understand you don't use them yourself due to their large size, and since you don't promote your web site it isn't a money spinner ?
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Old 7th October 2013, 03:17 PM   #80
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I don't have any permanent system at all. No space or money to do it.

Re the boxes on the site in question, they're not really double-mouth designs: although the expansion path bifurcates, they are ultimately single terminus speakers. Rather large single terminus I grant you (the curved back is functional).

No, the site doesn't bring much in. We cover running costs, although when you factor the time spent in design work, drawing the pdf plan-sets, creating the site itself we probably haven't broken even if you base that on a reasonable hourly rate. Since you ask, this is the position: as a rule I don't discuss my designs unless asked a specific question, & the site is not in my signature to prevent any possibility of accusations that I use the forum to sell things. I believe Bob takes a similar approach.

Last edited by Scottmoose; 7th October 2013 at 03:22 PM.
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