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Graham Slee View Drop Down
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Joined: 11 Jan 2008
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Points: 16314 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jan 2012 at 7:23am
Originally posted by suede suede wrote:

I now have a demoing pair of the dm685 at home and have listened to them the last few days. I like them very much but I've found that their results vary quite a bit with the quality and producing of an album. Really well produced stuff like Steely Dan or a lot of progressive rock sounds extremely good to my ears while poorer material often sounds a little grainy and a bit muddy almost. And with poorer I don't necessary mean garage music and 30's jazz but a lot of 60's 70's rock like early Led Zeppelin and such that I think should still sound grand on great speakers. I don't know if this is to be considered a fault with the speakers or or not? Confused
Anyone recognise this, the unusually great disparity between quality of material?

Johan


I do believe from my own experiences that speakers also need a burn-in period (a very long one with my pair of Harbeth M20). Crossover networks at the very least contain inductors and capacitors and most probably you can add to that resistors. Some also have resettable solid state fuses.

Capacitors and resistors seem to be the most burn-in dependent components (and semi-conductors too but there won't be any of them in a passive cross-over network).

Unfortunately just having them connected won't result in any burn-in like it can with an amp. They have to be run with music. The more a component is run near to its limit the faster it burns in. There are many problems with that including causing a war with neighbours when it comes to loudspeakers... Ouch
That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
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Cyreg View Drop Down
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Points: 316 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Cyreg Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jan 2012 at 10:41am
Best Wishes for 2012 for all GSP staff, forummembers and their families Smile
 
Graham, what if you wire one of the speakers out of phase and set the fronts opposite and very near to eachother Shocked
 
Much power can be put into the speakers without going very loud?
It's the theory of course, never tried it myself Wink
 
 
 
 
TecnoDec/RB250/MP110>GramAmp2C/PSU1; Cyrus CD8SE; > Exposure 3010S2D INT > Harbeth C7ES-3 '35th Anniversary'
cabling: IC 2x DNM V3; LScable Exposure DMF-two; Furu TP60 + MWaY and BlackCable pc's
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ServerBaboon View Drop Down
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Points: 970 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ServerBaboon Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jan 2012 at 10:55am
It's certainly a theory I have seen uttered before, would be interested to know if it actually worked.
Steve

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Various bits of GSP Kit ..well two so far, unless you count the cables that is.
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Cyreg View Drop Down
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Points: 316 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Cyreg Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jan 2012 at 11:41am
SB > got a Q for you regarding the HR Supply in other Topic I'll openWink
TecnoDec/RB250/MP110>GramAmp2C/PSU1; Cyrus CD8SE; > Exposure 3010S2D INT > Harbeth C7ES-3 '35th Anniversary'
cabling: IC 2x DNM V3; LScable Exposure DMF-two; Furu TP60 + MWaY and BlackCable pc's
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Fatmangolf View Drop Down
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Points: 9695 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jan 2012 at 12:23pm
From experience I confirm that this cancels out a fair bit of the low bass which is what goes through walls to your neighbours. Throw a heavy blanket or duvet over the two speakers and you'll have cut the volume down quite a bit inside the house, but keep the windows shut.
 
To ease in the drivers' coils and cones/suspension I suggest starting the burn-in at moderate volume, you can always go louder later.
 
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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suede View Drop Down
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Points: 1202 		Post Options Post Options   Thanks (0) Thanks(0)   Quote suede Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jan 2012 at 3:07pm
Originally posted by Fatmangolf Fatmangolf wrote:

Yes. And it is not a problem with your hi-fi equipment.



But the odd thing is that the disparity is not as great with my headphones, of course less well produced material sounds much lesser there too but not as annoyingly bad. I would have thought it would be the other way around Confused. Still, as long as the best stuff impresses you as much as it does with these I guess you can't complain.

Originally posted by Graham Slee Graham Slee wrote:



I do believe from my own experiences that speakers also need a burn-in period (a very long one with my pair of Harbeth M20). Crossover networks at the very least contain inductors and capacitors and most probably you can add to that resistors. Some also have resettable solid state fuses.

Capacitors and resistors seem to be the most burn-in dependent components (and semi-conductors too but there won't be any of them in a passive cross-over network).

Unfortunately just having them connected won't result in any burn-in like it can with an amp. They have to be run with music. The more a component is run near to its limit the faster it burns in. There are many problems with that including causing a war with neighbours when it comes to loudspeakers... Ouch


Thank you. I'll keep it in mind when I get the new speakers, this demoing pair is a few years old so they're most likely fully burned in already.
I have to say Cyreg's idea of dephasing the speakers to cancel out the bass during burn in is intriguing, but as I have them standing on bookshelves rather than on proper mounts I guess a lot of bass might still travel down through them. Maybe the blanket trick is better then?
I also have a CD with burn-in noise. I think it's pink noise in the background with a strange flutey noise sounding almost like a backwards played howling wind running up and down the mid-range frequency span. Do you think this stuff could be much more efficient when burning in audio gear than just playing music? It sure is harder to have to listen to than music that's for sure Wink

By the way
Happy new year to all of you and your dear ones! Party


Edited by suede - 03 Jan 2012 at 1:36am
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Fatmangolf View Drop Down
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Points: 9695 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jan 2012 at 8:59pm
The speakers need to be very close together for the bass to cancel out when the phase is reversed to one of them. I would have them 200-300mm apart and facing each other. Ideally they would be off the floor on stands rather in contact with shelves and the wall behind.
 
I have a similar CD, if you have one by all means use it. I suggest ripping the track(s) and using an iPOD or similar streaming source, that will avoid your CD servo mechanism repeatedly covering the same section of the disk.
 
Best wishes
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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