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High Pass Filter Question
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Mikeh View Drop Down
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    Posted: 13 Aug 2023 at 8:52am
My system has the Majestic balanced output feeding Proprius amps connected to Harbeth P3s and I had Jon modify the phono output to variable so that this feeds a pair of REL subs. There is a Minidsp in the line to the subs which has allowed me to integrate the subs using REW software measurements.
It sounds great to me.
I'm trying to get my head around whether there is any benefit from trying to introduce a high pass filter infront of the Proprious.  Measurements of the P3s show they drop off completely below 90Hz.  So if the Proprious are amplifying full range input is there 'wasted energy' and it would be better to remove (filter out)  input below 100Hz?
If there is be benefit, would a simple in line passive filter like the Shure A15HP work?
Mike

Technics sl1210gr with Victor U-2
Accession MM, Majestic + Proprius, Solo ULDE
Cambridge Audio CXC CD player
Lindemann Limetree Bridge streamer
Harbeth P3ESR XD paired with 2x REL t5x
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Fatmangolf View Drop Down
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Points: 8615 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2023 at 10:49am
Agreed, the benefit would be increasing amp headroom by not putting power into the low frequencies the speakers are not reproducing. There is a potential downside as the high pass filter will introduce a phase delay above the crossover frequency but it may sound fine. Try it and see what you think Mike.
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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Mikeh View Drop Down
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Points: 443 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeh Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2023 at 2:13pm
Cheers Jon, my thinking was along the same lines.  Might be worth trying to see if there's any audible difference. 
Mike

Technics sl1210gr with Victor U-2
Accession MM, Majestic + Proprius, Solo ULDE
Cambridge Audio CXC CD player
Lindemann Limetree Bridge streamer
Harbeth P3ESR XD paired with 2x REL t5x
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Fatmangolf View Drop Down
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Points: 8615 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2023 at 3:55pm
In my experience the Proprius amps haven't run out of energy so your  may not need fixing. I've just looked up the Shure unit, it is a passive mic filter at £100 for a pair and unclear what the part(s) inside are. It may not be right for the impedances in your hifi and any extra amp wattage may be outweighed by a loss in sound quality.
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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Graham Slee View Drop Down
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Points: 16041 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 16 Aug 2023 at 10:45pm
Originally posted by Fatmangolf Fatmangolf wrote:

Agreed, the benefit would be increasing amp headroom by not putting power into the low frequencies the speakers are not reproducing. There is a potential downside as the high pass filter will introduce a phase delay above the crossover frequency but it may sound fine. Try it and see what you think Mike.

I agree with Jon, if you hear an LF phase difference like I have it will "do your head in".

The 90Hz drop off suggests rising impedance and it won't "waste power".
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Mikeh View Drop Down
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Points: 443 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikeh Quote  Post ReplyReply Direct Link To This Post Posted: 17 Aug 2023 at 8:42am
Thanks for the feedback.  I'm in no rush to purchase any kind of filter and waste cash, so will do some more research and check out the options.
Mike

Technics sl1210gr with Victor U-2
Accession MM, Majestic + Proprius, Solo ULDE
Cambridge Audio CXC CD player
Lindemann Limetree Bridge streamer
Harbeth P3ESR XD paired with 2x REL t5x
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