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#266818 - 2017-08-13 10:43 AC line filter on DSP speakers
Registered: 2000-12-26
Posts: 853
Evdberg Offline
Pan-dimensional being
Evdberg Offline
Pan-dimensional being

Registered: 2000-12-26
Posts: 853
Loc: The Netherlands
I was looking for a cable on the attic when I found 2 SEEC HQSN-4U AC line filters. I have no idea how long they have been on the attic, but it must be at least for 7 years. They did not solve any of the problems I was experiencing at that time, so I removed them from my system.

I was thinking what to do with them. I guessed that they would not do much good with an unit that uses a switching power supply, but might be useful on something with a toroidal transformer (or maybe a linear power supply). So I decided to give them a try on my DSP7Ks. The result is clearly audible and very pleasant, much better control on the lows and smoother highs.

So my question, do any of you use something similar on your DSP speakers and what are your results?

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#266820 - 2017-08-13 11:22 Re: AC line filter on DSP speakers [Re: Evdberg]
Registered: 2016-05-04
Posts: 69
Ogri Offline
Mostly harmless
Ogri Offline
Mostly harmless

Registered: 2016-05-04
Posts: 69
Loc: London, UK
I haven't but I'm very curious about how improving DC power in DSPs may improve SQ. In the CA world so much is about clean power to components. It can't be too difficult to put other power supplies/ regulators in. Probably not very pretty, Meridianstein but it wouldn't be surprising to get a SQ bump. Not sure if it's irreligious to talk of it here though. I'm no engineer though.

Edited by Ogri; 2017-08-13 16:20.
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#266825 - 2017-08-13 12:57 Re: AC line filter on DSP speakers [Re: Evdberg]
Registered: 2002-08-28
Posts: 4,227
Mr Meridian Offline
President of the Imperial Galactic Government
Mr Meridian Offline
President of the Imperial Galactic Government

Registered: 2002-08-28
Posts: 4,227
Loc: Perthshire, Scotland
Nice to see you back Evdberg!

There was a fair bit of discussion here about AC cleaning/regeneration/conditioning around 2005 IIRC?

Cheers

George

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#266826 - 2017-08-13 13:01 Re: AC line filter on DSP speakers [Re: Mr Meridian]
Registered: 2002-02-14
Posts: 8,272
ncpl Offline
President of the Imperial Galactic Government
ncpl Offline

President of the Imperial Galactic Government

Registered: 2002-02-14
Posts: 8,272
Loc: Surrey, UK
I am currently on extended home demo of some Shunyata Denali units to power my 8k.

I will post a full review soon.


Rgds,
Nick

#15SE
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#266829 - 2017-08-13 14:55 Re: AC line filter on DSP speakers [Re: ncpl]
Registered: 2017-05-27
Posts: 64
_M_ Offline
Mostly harmless
_M_ Offline
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Registered: 2017-05-27
Posts: 64
Loc: Manhattan, NYC, USA
i use ExactPower EP15A Power Conditioner/Regenerator's and they do nothing for the sound -- basically they are large boxes housing the fuse in case of power surge/outage.

if you believe power cables make any difference above and beyond the one's that ship with your DSP's, then you really hate science and have allowed your imagination to justify buying overpriced wires. similarly, i would never buy a product from any co that sells these wires and cables while making anti-science claims.

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#266830 - 2017-08-13 16:13 Re: AC line filter on DSP speakers [Re: _M_]
Registered: 2002-08-28
Posts: 4,227
Mr Meridian Offline
President of the Imperial Galactic Government
Mr Meridian Offline
President of the Imperial Galactic Government

Registered: 2002-08-28
Posts: 4,227
Loc: Perthshire, Scotland
Originally Posted By _M_
if you believe power cables make any difference above and beyond the one's that ship with your DSP's, then you really hate science and have allowed your imagination to justify buying overpriced wires. similarly, i would never buy a product from any co that sells these wires and cables while making anti-science claims.
Hi M

Over the years we've been able to avoid flame wars about cabling on this forum, so let's not get too pejorative about the experiences or beliefs of either side. I have after market mains cabling on some of my kit which has been a splendid investment in terms of SQ, but the same cables on other bits of kit can give different (sometimes worse) results. It's so dependent on the individual installation. I've also tried several mains conditioners over the years, which can work superbly with some DSPs, but hamper others.

It's also worth noting that there is high representation on this site from the science and engineering sectors. There are adherents and detractors in both camps.

Cheers

George

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#266831 - 2017-08-13 16:19 Re: AC line filter on DSP speakers [Re: Mr Meridian]
Registered: 2016-05-04
Posts: 69
Ogri Offline
Mostly harmless
Ogri Offline
Mostly harmless

Registered: 2016-05-04
Posts: 69
Loc: London, UK
Isn't it DC running most of the stuff? Powering the DACs with cleaner DC, shouldn't we look just beyond the AC in?

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#266878 - 2017-08-15 09:23 Re: AC line filter on DSP speakers [Re: _M_]
Registered: 2000-12-26
Posts: 853
Evdberg Offline
Pan-dimensional being
Evdberg Offline
Pan-dimensional being

Registered: 2000-12-26
Posts: 853
Loc: The Netherlands
Originally Posted By _M_
if you believe power cables make any difference

This thread is not about cabling, so I do not understand your comment in respect to my post.

The SEEC HQSN-4U is an active line filter, see link for more info. These types of units were popular around 2000-2007, I must have bought mine in that time period. As said, I was not expecting much from it, but the difference I hear is significant. I will keep them in my system for now.

First of all I like to state that my system sounded already very good, visitors always commented on that, and I was very happy with it. No reason to change anything on my setup. So I was even reluctant to put the filters in. I did some more listening since my 1st post, so here are some more observations.

The main difference I hear is the quietness of the sound. I want to (and did!) krank up the volume to heights I never played at. Normally at a certain volume the sound breaks up, so that was the max I could (and wanted to) play at. I always thought that was because of the room, reflecting sound messing up the perceived sound. But that does not seem to be the case.

Other differences are the quality of the imaging, spaciousness and the realism of the sounds/instruments/voices themselves.

I guess I need to start looking for some additional units for my center and sub ...

Edited by Evdberg; 2017-08-15 09:23.
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#266879 - 2017-08-15 09:44 Re: AC line filter on DSP speakers [Re: Evdberg]
Registered: 2004-01-12
Posts: 2,257
Crion Offline
Senior Shouting Officer
Crion Offline
Senior Shouting Officer

Registered: 2004-01-12
Posts: 2,257
Loc: Stockholm, Sweden
I use these three separate AC protection filters. Each one of them gives a sonic benefit when connected. Not all AC protection/filters are equal and several constructions may limit the dynamic performance. These models work very well for my HT.

3xFront speakers (DSP8000SE, DSP7200SEHC:
Shunyata Triton V3

Frontend electronics (861V8, Dune Prime 3.0, AppleTV, side speaker :
Shunyata Triton v3

Music server, switches, router, side speaker:
Shunyata Denali 6000T

For a smaller 2ch TV system a single Shunyata Denali 6000T is an excellent choice. It has very high dB noise reduction which is easily measured and immediately noticed as soon as you plug it in. It has also 2 High-current outlets excellent for two stereo DSP's.


Future ID80 with video owner!
DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8/ID41, MC200, Sim2 HT380 T2 1080P, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, HDI Dune BD Prime 3.0 with Wireworld Platinum HDMI -> HD621 -> Audioquest Diamond RJ45. Shunyata Sigma Digital@861v8.
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#266884 - 2017-08-15 12:30 Re: AC line filter on DSP speakers [Re: Crion]
Registered: 2002-02-14
Posts: 8,272
ncpl Offline
President of the Imperial Galactic Government
ncpl Offline

President of the Imperial Galactic Government

Registered: 2002-02-14
Posts: 8,272
Loc: Surrey, UK
It is a Denali 2000T that I am testing. There is plenty of science available to understand here. Exactly the same as the science M used to build the PSU in the DSP's. Except that as science proves over and over you can push results further.

+1. This is not about cables.


Rgds,
Nick

#15SE
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