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Loudspeaker EQ |
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Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8960 |
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Since that change in crossover/passive EQ I have been able to have my speakers quite close and toed-in to almost point straight at me. They were slightly too bright before to do that and get depth behind. I am enjoying the new sound more, even if it's just a slight treble cut.
Edited by Fatmangolf - 17 Sep 2016 at 8:11am |
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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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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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I judge the sound of my MA Alpair 12P drivers by their on-axis balance when slightly toed in so their centre axes face my ear pinnae. The dispersion field of its treble is narrow compared to everything else it produces but they still sound great at wide off-axis listening positions.
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Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8960 |
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With only driver on each side there should be no lobbing/comb effects between drivers in the same cabinet. I suspect from my own speakers and what I have read that the right toe-in will depend on both the speakers and the room so please experiment till to get the best sound field.
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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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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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I have two pairs of Alpair 12PW that I can use to assist my single pair of 12P below 100Hz. This is so I don't have to use a conventional box to get really low bass in the nearfield. Don't yet know much about crossover designs but won't apply any crossover to the 12P; shall just shallow-slope filter the 12PW so they produce nothing above 100-150Hz. As bass frequencies are more omnidirectional, hopefully shouldn't get any lobing problems with two adjacent 12PW. If I do, I'll just use one and build a partial box for it. Will be able to level control the one or two 12PW using a second Proprius pair.
Edited by Ash - 20 Sep 2016 at 8:48pm |
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Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8960 |
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Some time ago I made a cheap test rig so my copy of REW 5 could measure the Thiele-Small parameters of the drivers in my GX300 speakers and I could consider the alignment used. Yes it is BB4 and Fb = 32 Hz if you are interested.
This weekend I got round to exploring an option I considered back then. It was to measure and compare the LF impedance curves of the two enclosures. I then matched the two pairs of woofers to get the reflex/speaker alignments as close as possible in the two cabinets. They now have virtually the same impedance peaks and same Fb. The effect is probably limited to a slight difference in rolloff but they are now very close in their sub bass response. I'd be lying if I said I could hear it! |
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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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Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8960 |
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Incidentally I worked out that the drivers' efficiency bandwidth Product EBP was about 90 so close to the threshold between suitability for closed box and for ported box. The box volume Vb and two speakers' compliance Vas and Qts gave me Qtc of 0.70. So with the port plugs in I have a really good alignment for transients and slow bass rolloff. With the ports open I have plenty of low frequency oomph in my listening room.
The idea of trying midrange boost came from the way the sound I heard changed as the volume is turned up. My speakers have a slight bass boost and rising treble which works well at moderate levels but less so if I am listening to music loudly when I notice the extremes more. I concluded it was probably due to the equal loudness contours (showing low and high frequencies are perceived as quieter at lower sound pressure levels than the middle range of sound) and I think background noise inside and outside the house is a factor too. When doing these comparisons I also try switching one speaker only and listening to the impact on the soundstage. Unsurprisingly the 10 ohm had limited effect on positioning left to right where the 6.8, 4.7 and 2.2 ohm resistors spread/smeared the positioning of voices (overlapping the bass to mid crossover) and guitars/strings (mid and treble). Just an experiment at the moment. However I think I will probably be changing the switch I put in for the HF cut to a double pole unit so I can include a midrange option. I will do some more listening first! |
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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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Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8960 |
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Well I have identified three settings that I like enough to hard wire them into a three way switch:
Full HF plus the 4R7 and 3R3 in parallel so about 2.5 dB middle boost compared to stick - "detail excavator" HF on -2dB, no mid-boost - "comfy slippers" HF on -2dB, 10R and 3R3 in parallel for about 1dB mid-boost - "balanced when loud" |
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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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