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Multi-Way Conventional loudspeakers with crossovers

is crossover cooling a thing?
is crossover cooling a thing?
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Old 14th October 2017, 05:26 AM   #11
JMFahey is offline JMFahey  Argentina
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And there is no way you can drive 1000W RMS into a speaker mounted inside a 1 cu Ft box
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Old 14th October 2017, 03:12 PM   #12
Overkill Audio is offline Overkill Audio  United Kingdom
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Default High power, small sealed box, Pro drivers & DSP = success!

Quote:
Originally Posted by JMFahey View Post
And there is no way you can drive 1000W RMS into a speaker mounted inside a 1 cu Ft box
Oh yes you can, and with fantastic results!
A few caveats though:

(1) Ditch all passive crossovers and replace with a high quality DSP active crossover. 250 up to 5,000 depending on quality of DSP, A to D and D to A conversion. This one is an absolute giant killer... DriveRack PA2 | dbx Professional Audio

(2) Ditch all ports / transmission line / ABR / vents.... They all suck & blow) out of phase with the direct wave front.... But thats another story.

(3) Ditch all audiophile drivers and use high performance Pro audio drivers and use real high power amplifiers.... This means big and is why most people dont follow this path.

Here are a few examples of high power / small sealed air volume designs which deliver low distortion, accurate bass / midrange with outstanding reliability.
(1) 900 watts into 24 litres (28 litres = 1 cubic foot). Simulation & driver spec of the RCF 15N 401, this is a killer bass / subwoofer solution.

More in a mo... files too big.
Cheers
Derek.
Attached Files
File Type: pdf RCF LF 15N 401 Sim.pdf (505.5 KB, 7 views)
File Type: pdf RCF LF15N401.pdf (389.1 KB, 5 views)
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Old 14th October 2017, 03:49 PM   #13
Overkill Audio is offline Overkill Audio  United Kingdom
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Default RCF Mid bass version

Here is the mid bass version, the RCF MB 401.

Compared to the LF 401 it's a couple of dB down in output at the lowest frequencies but only needs 18 litres of air and has a superb Mms / Bl ratio of 3.8 (100g Mms with 26.1 Bl) allowing it to be crossed over as high as 1,200Hz, with around 800Hz being optimal.

Note the very low Qts yet is still hits 97dB at 20 Hz....Without any room gain, which adds 6dB to 9dB gain with back wall or corner placement respectively.

This driver makes a great two way / stand mount when paired with a good full range / broad band driver.... Crossover anywhere between 80Hz and 800Hz depending on required SPL, low end power handling of full range driver and Eq to suit ones sonic preferences using the DSP.

Cheers
D.
Attached Files
File Type: pdf RCF MB 15 N401 Sim .pdf (121.3 KB, 1 views)
File Type: pdf RCF MB15N401.pdf (248.8 KB, 1 views)
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Old 14th October 2017, 03:58 PM   #14
Overkill Audio is offline Overkill Audio  United Kingdom
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Default Precision Devices PD 158

This is one I built up as part of the development of my RED driver.

Able to run in tiny air volumes with a midrange to die for, yet still has that gorgeous easy low end that only comes with 15 inch drivers barely moving.... under 1mm +/_ cone movement and still solid to 33 Hz.... Left hand piano is so accurate and lifelike!

Hope the above inspires someone to take the plunge!
Cheers
D.
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File Type: pdf Precision Devices PD 158 Sim - 200 - 600 watts .pdf (574.0 KB, 17 views)
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Old 14th October 2017, 04:04 PM   #15
Overkill Audio is offline Overkill Audio  United Kingdom
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Default Spec sheet on PD 158

File too big to post... Here is the link to the PDF on the Precision Devices PD 158.
http://www.precision-devices.com/fil...EET-310114.pdf
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Old 14th October 2017, 04:44 PM   #16
Pano is offline Pano  United States
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is crossover cooling a thing?
Having seen crossovers burst into flames - I think cooling is a good idea.
Of course that was P.A. speakers with 100s of watts pounding them. Seems much less likely in home use.

But as Erik says, use XSim to look as power in the various parts. That will give you a good idea of what's going on.
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