Tweeter Horn Magic - What does a Phase Cap do?
22 هزار بار بازدید -
2 سال پیش
-
Kind of a show and
Kind of a show and tell on the speaker to begin with. I made these in 2009 and used them in my old workshop for 4 years. It's a three way active and I made the amps / crossovers plus the power supply. Each amp board has lowpass and highpass Sallen-Key filters and an LM3886 as the amplifier. The crossover points are 400hz and 3000hz, set by the values used for the filters on the amp boards.
I consider this to be some practical exploration on what a horn and phase cap can do to the response and I'll use this knowledge to mess around with the horn flare on my new open baffle speakers.
The measurements clearly show the horn bumping up efficiency making it possible to get rid of that natural peak in the response the tweeter has. The phase cap helps as well to produce a more even response with a smooth roll-off.
In the last word on diffraction, I think it's one of the more obvious ironies in audio today that the same guys that think diffraction is a big problem, advocate listening in an untreated room. In fact they emphasize the importance of the off-axis response of a speaker so that it's more complete when it bounces off the wall beside it! If there was ever an audible effect, the kind of comb filtering those reflections produce would be at the top of the list.
That raw response (from jus 24" from the speaker) is what your ears are receiving. Not the smoothed response where you can examine minor ripples - that full 20db deep grass. And from your listening position that grass starts to look like hay that's late for harvest.
You can help support the work I do in making these videos:
Project plans for sale: https://ibuildit.ca/plans/
Join the ibuildit community on Loacals: https://ibuildit.locals.com
Support this channel on Patreon:
https://www.patreon.com/user?u=865843...
#diyspeakers
#johnheisz
#audio
My "Scrap bin" channel:
ibuilditscrapbin
My main channel:
jpheisz
Website: https://ibuildit.ca/
Facebook: Facebook: I-Build-It-258048014240900
Instagram: Instagram: i_build_it.ca
I consider this to be some practical exploration on what a horn and phase cap can do to the response and I'll use this knowledge to mess around with the horn flare on my new open baffle speakers.
The measurements clearly show the horn bumping up efficiency making it possible to get rid of that natural peak in the response the tweeter has. The phase cap helps as well to produce a more even response with a smooth roll-off.
In the last word on diffraction, I think it's one of the more obvious ironies in audio today that the same guys that think diffraction is a big problem, advocate listening in an untreated room. In fact they emphasize the importance of the off-axis response of a speaker so that it's more complete when it bounces off the wall beside it! If there was ever an audible effect, the kind of comb filtering those reflections produce would be at the top of the list.
That raw response (from jus 24" from the speaker) is what your ears are receiving. Not the smoothed response where you can examine minor ripples - that full 20db deep grass. And from your listening position that grass starts to look like hay that's late for harvest.
You can help support the work I do in making these videos:
Project plans for sale: https://ibuildit.ca/plans/
Join the ibuildit community on Loacals: https://ibuildit.locals.com
Support this channel on Patreon:
https://www.patreon.com/user?u=865843...
#diyspeakers
#johnheisz
#audio
My "Scrap bin" channel:
ibuilditscrapbin
My main channel:
jpheisz
Website: https://ibuildit.ca/
Facebook: Facebook: I-Build-It-258048014240900
Instagram: Instagram: i_build_it.ca
2 سال پیش
در تاریخ 1401/04/16 منتشر شده
است.
22,084
بـار بازدید شده