GSP Line amps
Printed From: Graham Slee Hifi System Components
Category: And the rest
Forum Name: Amplification
Forum Description: Share your interests or views on amplifiers, preamps, etc
URL: https://www.hifisystemcomponents.com/forum/forum_posts.asp?TID=768
Printed Date: 26 Mar 2026 at 11:13pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: GSP Line amps
Posted By: Analog Kid
Subject: GSP Line amps
Date Posted: 13 Jan 2010 at 6:05pm
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So what can you tell us about the upcoming line amps? When will they be ready? What features will they have? (Tone controls will hopefully be included?  ) |
Replies:
Posted By: Analog Kid
Date Posted: 25 Jan 2010 at 2:01pm
GSP Audio does not want to discuss unannounced products. 
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Posted By: Graham Slee
Date Posted: 25 Jan 2010 at 3:27pm
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I'd love to discuss "unannounced products". But at the moment I'm still unsure what to announce. ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: Graham Slee
Date Posted: 16 Feb 2010 at 11:11pm
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I have been investigating tone controls and still have a way to go. The last time I did tone controls was on a post production mixer about 17 years ago. I recall they measured "flat" in the mid positions but how "flat"? Now with the benefit of a simulator, I can see that "flat" can mean a subtle hump, or dip, or even shelving up, or shelving down of the response, where I'd have thought it should be perfectly flat. Obviously the source impedance driving them (buffer stage) and the output impedance of the summing amp (tone control amplifier) they're built around, have a marked effect on this flatness - they influence it, or add to the tone control network impedance. Here I must add I'm talking about the "Americanized" Baxendall type of tone control - I still have to examine the passive solution. I did dig out an old Quad 33 tone control circuit for reference and can see exactly why the tone control defeat switch was so important - it would alter the sound simply because in the centre position there is this hump/dip/shelf which could be as much as 1 or more decibels. I am not saying the Quad 33 was a poor design - hats off to the designer! It was good at the time. My own calculations for a circuit when run exhibited much the same problems. I decided after many hours to take a break from it and then take another look. I will try one or two fixes in the next day or so, and then, if unsuccessful, I will venture down the passive route and report further on my findings. ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: Analog Kid
Date Posted: 29 Mar 2010 at 11:50pm
The above need some clarification. Why is flatness a concern with tone controls? Just by using tone controls to adjust the treble and bass, you are already manipulating the frequency spectrum of the music, by making the amplifier produce more or less bass and treble, so common sense would say that flatness is not an issue, but maybe I misunderstand something. |
Graham Slee wrote:Posted By: less
Date Posted: 30 Mar 2010 at 9:02am
I think AK that what you are missing is that some people may not want to use the tone controls all of the time or at all, therefore any change in the signal defeats that goal. I have tone controls on my current amplifier but very rarely use them. I was not aware though, until now, that their prescence might still be affecting the signal (Arcam alpha 9 integrated). Regards Les ------------- I don't do mediocrity! Les Sutherland |
Posted By: Graham Slee
Date Posted: 30 Mar 2010 at 1:11pm
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Agreed... If we can show the tone controls result in a flat response when set to their midpoints there should be absolutely no need for a defeat switch - I mean, why have a defeat switch to defeat something that doesn't need defeating? So why did so many amps need defeat switches? Exactly! Because the tone controls never had a flat position no matter where they were set! I don't really like mentioning others but if you model a Quad 33 tone control on a simulator you'll get my drift... So yet again, the hi-fi industry has gone to silly extremes again to cover up for it's inadequacies. If tone controls are designed properly... But then again, in defence of Quad, they didn't have simulators in the day of the 33 (so they couldn't have known). ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: Juliangst
Date Posted: 03 Jun 2011 at 2:58pm
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ANy news on when the Line Amp will be available? I see there is now a lot of discussion about a Power Amp, but the Line AMp seems to have faded away!
------------- JJG |
Posted By: Graham Slee
Date Posted: 03 Jun 2011 at 4:03pm
Only until we had some good amplification (for speakers not cans) to be able to develop it - and that's now sorted by the Proprius mono blocks. ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: iamalexis
Date Posted: 05 Jun 2011 at 10:50am
| so is the line amp next in line once you have finalised the proprius mono blocks? is the design of the proprius to tie in with the line amp? |
Posted By: Graham Slee
Date Posted: 05 Jun 2011 at 11:16am
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Yes
------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: freemand
Date Posted: 26 Aug 2011 at 3:43pm
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Hi Graham,
Will the Line Amp be available this year, and do you have Pics of it?
Dave.
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