Driver backside reflections under scrutiny

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Driver backside reflections under scrutiny

Рет қаралды 1,171

Күн бұрын

Following up on Nigel's folded pipe build questions.
Looking at what happens to the rear output of the driver, which is 50% of its energy output. Why the driver basket is important, and what can be done to improve it.
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Пікірлер: 21

@electricbeachaudio 3 ай бұрын

Hi Janos. I would be very interested to have your thoughts on cancellation effects. Relative to this video subject, it occurs to me that the reflections reaching the magnet/ basket/ cone are also being met by the driver’s subsequent output. But a more obvious effect for consideration must be floor bounce and driver position distance from the floor. Or maybe not, I don’t see it comes up so much. I do know that if you mount a bar of quadrant along the bottom edge of a cabinet is has a dramatic effect on the bass, for better or worse. Then again, are there not cancellation effects at play between the two stereo speakers which would change with the distance between them, even as you are judging the effect of positioning cabinets relative to boundaries. Should we be considering this more or is it a non-issue in the scale of things?

@realworldaudio 3 ай бұрын

Hi Steve, this is a very good point and relevant issue! I will make a video on it ; ). Yes, a little bar close to the bottom edge does make a huge difference.

@GuitarSlinger60 3 ай бұрын

Fantastic - great explanation - really helpful to have the addrd clarifications - I am aware that some time back Dave of Planet10 did a piece on drivers mods which also looked at the basket issues (as well as some cone mods which are not likely to be for most DIY'ers!) - he also suggested reprofiling the inner flat face of baskets (and also possibly adding damping material there if not possible to reprofile) & confirmed the benefits he saw in the drivers they treated. *****

@garywong8361 3 ай бұрын

Good explanation 👍

@amitanaudiophile 3 ай бұрын

I also like to explore/see about displacement of cone vs input signal voltage graph ,to find out clipping of speaker it self. Generally production technicals only consider clipping of signal at input terminals of speaker. But there must be mechanical limit to the smooth displacement of speaker cone and it end stops. Which has to be considered to listen distortion free playback. So we know signal clipping and can control it who knows how to. But mechanical limit clipping is where we have to work/explore and find solutions.

@realworldaudio 3 ай бұрын

Thank you, yes, that is a superb point! 👍👍👍👍 I think that could very well be the most important parameter yet to be added to driver measurements, and aid both high quality / high fidelity production for home users, and more freely push the max SPL for PA applications.

@amitanaudiophile 3 ай бұрын

@@realworldaudio ya... This can be measured by high precision displacement measurement device like Bentley Nevada probs.

@MrTeff999 3 ай бұрын

Tech Ingredients on KZfaq was my introduction to the Voigt tube. There are a few differences in his construction. 1) He used a damping material to deaden the plywood construction. 2) He placed a curved reflector at bottom to smooth the wave as it exits the port. Question: Are these things beneficial, unnecessary, or counterproductive? Bonus question: I saw a photo of Voigt tube speakers that have an open bottom, so the port faces downward. (It was elevated about two inches.) Your thoughts about this?

@stephenhall3515 27 күн бұрын

A quite old way of minimizing the 'sail' effect in pressed baskets was/is carefully (and slowly) drill asymmetric holes in order to evacuate the pushed air as quickly as possible but at random so that no 'whirlwind' can occur. Air evacuation around solid objects had a tendency to make patterns of adhesion by nature therefore random exit is the goal. If one looks at, say, a lamp post on breezy days (preferably in autumn when leaves are falling) it soon becomes clear that litter such as leaves circulate and form patterns as they appear to climb the post. Regarding the native resonant frequency of the struts of a driver basket, it is worthwhile tapping each of them. They are usually slightly different but at some point retain a total harmonic resonance somewhere of the frame. Your idea of using different thicknesses of masking tape or, better for longevity, good quality pvc insulation or parcel tape -- then remember to cut through to clear the drilled holes for evacuation. This is fiddly but well worth it.

@jimmiedean8035 3 ай бұрын

I built a prototype with a basket connected to the motor, with ajustable rod ends. Either 6 or 8 must be used. For a push/pull tension. To cancel harmonics. The motor can be adjusted. For optimum coil alignment. And to raise or lower cone/coil static position. Unlike everything else. 😊

@realworldaudio 3 ай бұрын

That's frigging genius! I wish all manufacturers built their drivers like that, in addition it would also make reconing a breeze. :)

@jimmiedean8035 3 ай бұрын

@@realworldaudio And they have a an assortment of anodized color rods. And even Teflon rod ends. I also use them for cabinet stand hardware. For ajustable angles. Speedway motors, in house manufacturing. 😏

@realworldaudio 3 ай бұрын

@@jimmiedean8035 👋👏👍👍👍👍👍👍👍 Teflon rod ends is a genius, to cut down on the metallic resonance.

@amitanaudiophile 3 ай бұрын

Truly informative..Thanks a lot

@phillipmorris9847 3 ай бұрын

thank you

@MrTeff999 3 ай бұрын

The area of the cabinet immediately behind the driver seems to be a choke point that interferes with the smooth propagation of waves. What if the driver was mounted an inch or two forward of the cabinet - with the appropriate modifications to the cabinet, of course?

@realworldaudio 3 ай бұрын

Yes, giving more space behind the driver would be quite advantageous. However, moving the driver forward is catastrophic. Even an 1/8in spacing already shows as very noticeable unwanted increased coloration in the midrange, and 1-2in difference shows up as a major disruption in bass, unless the spacing extends to the entirety of the front panel. (Making the cabinet extremely heavy, although doable.)

@gerihifi 3 ай бұрын

Darth Vader of HiFi 😅😊 Nicely explained, thanks a lot!! Btw: love your Sony CDP, I also have two of them, modified by Swoboda Audio (insanenly good).

@realworldaudio 3 ай бұрын

Nice, I'm glad there are mods for these superb players! Sadly mine is totally dead, and I will use it for a project.... probably as the chassis and transformer for a DIY DAC. :) To keep it in style ; )