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Achieving High Fidelity Sound

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discrete badger View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote discrete badger Quote  Post ReplyReply Direct Link To This Post Posted: 29 Aug 2022 at 4:59pm
As an alternative viewpoint, I think with a fairly extreme bass-boost EQ curve - carefully devised to counteract the natural rolloff - it'll work.

At normal "loud" levels, that level of EQ will eat a lot of amp current, voice coil heating capacity, and cone excursion, but with nearfield listening as in this case only very low listening volumes are needed, so a surprising level of bass extension will be possible without these effects becoming significant.

As I may have mentioned before I have EQ including ~+20db at 20Hz on my second system. It works because the amp is not short of power, I listen at low levels, and most music has little in that region anyway. The result is sonically marvellous. But I'm well aware that if I turned it up with demanding music I would fry the bass drivers. So I don't. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 29 Aug 2022 at 6:02pm
I stay in the nearfield low power domain otherwise the room takes over everything and you lose the purity of sound.

Instead of bass-boosting, I could shelf everything else down. I will be using the proximity effect a bit too. CHR-120 has a resonant frequency of 34Hz, which is pretty low. If I put them in suitably large cardboard boxes and only feed them 20-80Hz signals, I think they will do very well.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 01 Sep 2022 at 10:52pm


The Alpair 10P are sounding really good on nearfield cardboard baffles. Brought a big cardboard box home from work yesterday and have cut it in half ready to mount two CHR-120 on each. DAK 5V 3A supply now powering the Pink Faun SPDIF soundcard. Spatia speaker cabling and DSP hardware are the only purchases left. I have a second Majestic/Enigma and Proprius pair for simultaneous listening comparisons; MySphere will show up everything that's wrong with the speakers. The speakers are clear and spatial but dynamically, they're nowhere near as flat as my headphone reference. It will be a long road to the goal.


Edited by Ash - 01 Sep 2022 at 10:52pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 09 Sep 2022 at 4:58pm

Pi2AES-Lite arrived yesterday. Assembled it with my Pi3B+ today. Nice case fit and little rubber feet for the bottom of the case. Quite a big spacing between the Pi board and the HAT, probably to allow for more airflow and CPU cooling/heatsinking, especially with a Pi4B. Has optical and coaxial SPDIF, the optical port has no little door/shutter when not used, which is a bit unusual. Its casing has a fixture point to attach it to the acrylic case, which is unusual but welcome. The BNC is AES standard, which I won't use. The PI 5V is easily removable if I want to power Pi and HAT separately but the external 5V jack was omitted last minute so I have to do a little DIY to try external 5V, voiding my warranty in the process. So nice of them to just give up on that feature shortly before they ship the board... Angry I will make it work in my favour though. There is a hole in the acrylic case where I can insert cabling for external power. If I try covering the entire case in aluminium foil, for electromagnetic shielding, I would wire a wifi antenna from the module to the hole so I can control it headlessly. Four USB ports for flash drives or large capacity SSD. I will be able to test several things to see whether they are fact or fiction.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2022 at 5:29am
Anybody tried using thick-walled polystyrene boxes for speaker enclosures? Rigid enough to keep shape/structure, low mass and highly absorbant of sound energy. I just got the idea after looking at the MarkaudioSota Tozzi speaker enclosures. Hmmm... Big smile Can veneer it with something prettier if desired.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2022 at 4:28pm
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 04 Nov 2022 at 6:52pm
Got a secondary palm-sized PC with some pretty capable specs.


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