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Multi-Way Conventional loudspeakers with crossovers

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Old 18th June 2021, 02:44 AM   #11
AllenB is offline AllenB  Australia
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Even a small 1" CD can attain reasonable levels crossed at 500Hz on a waveguide that doesn't load that low using a first order crossover. A worst case scenario you might say. If you don't do all of those things at once then you should be in business.

750Hz is where many DIYers cross their 1" CDs.
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Old 18th June 2021, 07:12 AM   #12
newvirus2008 is offline newvirus2008  India
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Well, according to the 1W/1m curve, even on the smaller horn, the driver seems to manage about 104dBSPL (@1m), so maybe if you don't apply even 1W (the usual case), you could then possibly get to 750Hz. A larger horn would definitely load much better down there. You could use a steeper filter, in case you're not sure.

But note that the primary resonance of the driver is only slightly above 400Hz, so 750Hz maybe around the minimum you should get to (standards vary). Besides, usual listening distances are also greater than 1m. Nevertheless, you should have no problems matching this to a 90-95dB/W Hi-Fi woofer.

Cheers!

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Old 18th June 2021, 07:24 AM   #13
AllenB is offline AllenB  Australia
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It's not usually a problem crossing CDs below their resonance.
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Old 18th June 2021, 08:59 AM   #14
newvirus2008 is offline newvirus2008  India
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Well, agree, but the resulting THD is often not acceptable to some but, again, standards vary. It's however unlikely that the driver would be "damaged" by a home-experiment (even without a horn), so the OP could try and see if he/she likes what 750Hz sounds like. Looks like we're reaching a point where things are subjective.

Keeping the above curve aside for a minute, it's the acoustic impedance of the OP's bigger horn that decides the lowest frequency he could get to, i.e. if it still has a decent percentage (say >50%) of its HF acoustic impedance at 750Hz, it's going to be just fine, technically also. And one thing that's sure about both 2374 and 2384 horns is that they both load well at 750Hz.
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Old 18th June 2021, 09:28 AM   #15
AllenB is offline AllenB  Australia
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I've had no problems with harmonic distortion, and I don't have low standards.
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Old 18th June 2021, 10:08 AM   #16
multitask is offline multitask  Denmark
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7-800hz xo on the selenium? damn. iv blown multiple sets of these with an active 1300hz 2.order. no problem damaging it at all imo.
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Old 18th June 2021, 10:11 AM   #17
newvirus2008 is offline newvirus2008  India
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Well, I have few ASD1001 1" exit compression drivers and I shall try finding out how loud/good they sound after I cross them over at 500Hz, a whole octave below their 1.23kHz resonance, based on your opinion, AllenB. But, to be frank I would not expect any great outcome.
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Old 18th June 2021, 10:16 AM   #18
AllenB is offline AllenB  Australia
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I have to say that I have not used the Selenium. Different diaphragm materials may respond differently to extreme travel, if that is a factor multitask. Thanks for pointing out how I might have mislead.

That said, hitting the limit is easy to hear and not something I would have accidentally overlooked. I also do high level measurement sweeps full range.
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Old 18th June 2021, 10:56 AM   #19
newvirus2008 is offline newvirus2008  India
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Quote:
Originally Posted by AllenB
Different diaphragm materials may respond differently...
The D220Ti has a titanium diaphragm, whereas other Selenium models such as D305, D405 etc. are available in both phenolic and titanium.

In my opinion, the OP could still try 750Hz on the 30" horns, albeit at lower SPL (< 104dB) and a LR4 filter, provided the curves are accurate.

Quote:
Originally Posted by multitask
iv blown multiple sets of these with an active 1300hz 2.order. no problem damaging it at all imo.
Could you please share the application, power level and SPL at which you were using these drivers. Was it a modified JRX ? Just a guess.

Last edited by newvirus2008; 18th June 2021 at 10:59 AM.
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Old 18th June 2021, 12:19 PM   #20
multitask is offline multitask  Denmark
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Gainphile: S15 - Econowave DSP

somewhat loud ofcourse, but not more than what i would expect a respectable dome tweeter to handle. i switched to 4th order to try and remedy the issue.
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