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Multi-Way Conventional loudspeakers with crossovers

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Old Yesterday, 09:04 PM   #2781
mark100 is offline mark100  United States
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A bit of a rookie question...why be worried about impedance, even down to 500Hz?
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Old Yesterday, 09:12 PM   #2782
diyiggy is offline diyiggy
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So ok because the driver is strong enough (mechanical) for a 700 hz in hifi use : surmise less than 90 db average very confortble & most reccordings :7 to 8 db more average dynamics raises max? so less than 100 dB at highest peaks for most hifists at home but rare good classical reccordings that don't have loudness mixing - and in relation to the average spl 90 db listening level, most reccordings, most dacs (amps) noise floor ! -



Is it a good reading of your input, please - sorry for the noob input level - pun-here-? Often difficult to read correctly the datasheets for a simple enthusiast...
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Old Yesterday, 09:32 PM   #2783
Ro808 is offline Ro808  Netherlands
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Originally Posted by mabat View Post
Slightly off-topic - I've just ordered new Faitals HF1440 for €225/piece. Hope they are worth it!
Nice!
I'm sure they are worth it.

You've ordered here, I assume?

Click the image to open in full size.


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Originally Posted by diyiggy View Post
They say 700 hz but watching the impedance curve, 700 hz is 40 ohms... are they not a little bit optimist and should have said 900/1000 hz cut-off for this driver
I wouldn't hesitate to use this driver from 600 Hz and 450-500 Hz is probably ok, as is for it's smaller brother, the HF200.
The HF1440 has a 3.4" diaphragm compared to 2.91" of the HF200.

Impedance plots are a bad indicator of compression driver capabilities.
Some people use this 1", crossed at 800 Hz for livesound applications at very high SPLs:
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File Type: png Beyma_CD-10Nd_N_(Impedance).png (4.4 KB, 97 views)

Last edited by Ro808; Yesterday at 09:56 PM.
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Old Yesterday, 09:45 PM   #2784
diyiggy is offline diyiggy
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... So better the HF1440 so to speak about the trebles and low end in hifi use ?


Ah, 500 cm width horn for them ?


Edit : 2 ways possible with a low Le bass driver with circa 35 Fs driver, circa BR 45 hz tuning, rephrased such low pass/compression drivers in the right horn are XO proof with a 15" in the cut-off area : let be crazy : 500 to 700 cut-off?
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Old Yesterday, 10:02 PM   #2785
gedlee is offline gedlee  United States
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Quote:
Originally Posted by mark100 View Post
A bit of a rookie question...why be worried about impedance, even down to 500Hz?
That's correct, I was mostly thinking about excursion. Impedance is virtually irrelevant.
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Old Yesterday, 10:07 PM   #2786
diyiggy is offline diyiggy
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how is it working between the impedance top peak and its lower upper feet : is there not an acoustical short-cut here created by the driver resonance materialised in the impedance peak, so spl loss ?


Or it's irrelevant because we want to use such datas with low mechanichal constraint -hifi use- i.e. the amp can manage it as far we can deal with distorsion and if X-mech is not reached?
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Old Yesterday, 10:09 PM   #2787
Ro808 is offline Ro808  Netherlands
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Quote:
Originally Posted by diyiggy View Post
Edit : 2 ways possible with a low Le bass driver with circa 35 Fs driver, circa BR 45 hz tuning, rephrased such low pass/compression drivers in the right horn are XO proof with a 15" in the cut-off area : let be crazy : 500 to 700 cut-off?

That's what I am focusing on.

The HF1440 combined with either 15PR400, 15FH500, 15FH510, or 15FH520 are proper ingredients.

Beyma offers similar drivers.

I'm currently looking at subwoofer drivers with a smooth roll-off.
Some say you need a curvilinear cone for mid-range reproduction rather than a straight one, common with subwoofer drivers.

I'll leave it at this, before I drift off-topic.

Last edited by Ro808; Yesterday at 10:28 PM.
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Old Today, 12:54 AM   #2788
diyiggy is offline diyiggy
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Very fast : seems most of 15" Beyma have stifer cut-off below 1 hz...at least often ! Instinct which has nothing to see with knowledge says to me the woofer should be a little horned both to better tmatch the horn profile, match time horizontal starting point around cut-off while with the bafle step & all I don't know. My feeling it should has a the lowest Le/1 khz and a solid amp to control it in order to try to match the cd/horn... Faital 15HF250 seems to be stronger than the 15pr400 while having a worsr Le. Some says a good 15" EV with higher Fs and worse datasheet is more lively and better sounding... ...


I believe to remember Earl G was using very stiff and heavy cone but nuclear motor (high BL)... but eventually in the Suma with multiple distributed sub if the cut-off was too high in the Suma big cabinet if very huge rooms?!


Ok, off-topic, let- you guys focus on the horn shape + cd combo, already hard to follow for me...
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Old Today, 07:35 AM   #2789
mabat is offline mabat  Czech Republic
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Regarding woofers, it's all about the frequency response in the end, which is normally no issue if used only up to 500 - 700 Hz. So it boils down to basic directivity and the total Q at resonance (may be important for passive crossovers, irrelevant for active). Efficiency and power dissipation capability is more than good enough with these drivers. That's about it.
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Last edited by mabat; Today at 07:39 AM.
 

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