I just got a new set of speakers (KEF R3) which I've tried to tune using REW. I'm thinking of inserting a minidsp 2x4 HD between DAC (Oppo UDP-203) and amplifier (NAD C325BEE) to implement the corrections.
As a prototype I created convolution filter using REW + UMIK-2 for measurement using RTA pink noise. I can hear a subtle but significant improvement in the sound and I see it helps some of the music that I found it a bit harsher on the ears. Still needs tweaking but I'm new to all this so wanted to post my overall strategy here to check if I'm going in the right direction. Thanks for reading and any tips are much appreciated.
==FIG 1==
Room = 22 x 21x 7.5 with half partition wall with kitchen in right half
Left speaker = 29" from front wall/45" from left wall (half port bung in place to reduce boundary effect)
Right speaker = 29" from front wall/axially centered (port fully open)
==FIG 2==
In room response (Pink = left speaker Blue = right speaker)
==FIG 3==
Corrected L+R response (Blue = corrected Orange = original)
==FIG 4== Roon signal path
Here are some questions I'm contemplating. Would be great to hear any recommendations -
(1) Will adding miniDSP to the signal chain degrade sound significantly? I see the chips have similar specs so I'm hoping they would be equivalent.
miniDSP => ADSP21489 => 115 DR 107 S/(N+D)
UDP-203 => AK4458VN => 115 DB SNR THD+N: -107dB
(2) Is having port bung only on one side recommended? I haven't heard of this but it does make the L and R responses much closer.
(3) I read about phase corrections in addition to filters but I'm not making much progress understanding how to do it. Is this needed?
(4) I only used negative EQ parameters but it appears the response has been normalized. I was getting clipping as a result so I turned on volume normalization in Roon. I don't understand how DSP works but is it effectively converting my filters to +ve EQ? I'm wondering if that might result in wasting amp power trying to fill in the response dip between 50-100 hz
:::: LEFT filters ::::
Filter 1: ON HSQ Fc 90.00 Hz Gain -1.80 dB Q 1.00
Filter 2: ON PK Fc 122.0 Hz Gain -2.00 dB Q 4.139
Filter 3: ON PK Fc 199.5 Hz Gain -3.00 dB Q 2.000
Filter 4: ON PK Fc 590.0 Hz Gain -3.40 dB Q 5.312
Filter 5: ON HSQ Fc 1000 Hz Gain -1.00 dB Q 1.00 (tweaked house curve)
Filter 6: ON HSQ Fc 3000 Hz Gain -0.50 dB Q 1.00 (tweaked house curve)
Filter 7: ON HSQ Fc 4000 Hz Gain -1.00 dB Q 0.500 (tweaked house curve)
Filter 8: ON PK Fc 1150 Hz Gain -1.50 dB Q 5.000 (tame presence brightness)
:::: RIGHT filters ::::
Filter 1: ON HSQ Fc 100.0 Hz Gain -2.00 dB Q 1.00
Filter 2: ON PK Fc 137.0 Hz Gain -5.00 dB Q 7.320
Filter 3: ON PK Fc 161.5 Hz Gain -2.00 dB Q 8.131
Filter 4: ON PK Fc 204.0 Hz Gain -4.50 dB Q 7.000
Filter 5: ON PK Fc 561.0 Hz Gain -5.50 dB Q 3.000
Filter 6: ON HSQ Fc 1000 Hz Gain -1.00 dB Q 1.00 (tweaked house curve)
Filter 7: ON HSQ Fc 3000 Hz Gain -0.50 dB Q 1.00 (tweaked house curve)
Filter 8: ON HSQ Fc 4000 Hz Gain -1.00 dB Q 0.500 (tweaked house curve)
Filter 9: ON PK Fc 1150 Hz Gain -1.30 dB Q 5.000 (tame presence brightness)
Cheers!
As a prototype I created convolution filter using REW + UMIK-2 for measurement using RTA pink noise. I can hear a subtle but significant improvement in the sound and I see it helps some of the music that I found it a bit harsher on the ears. Still needs tweaking but I'm new to all this so wanted to post my overall strategy here to check if I'm going in the right direction. Thanks for reading and any tips are much appreciated.
==FIG 1==
Room = 22 x 21x 7.5 with half partition wall with kitchen in right half
Left speaker = 29" from front wall/45" from left wall (half port bung in place to reduce boundary effect)
Right speaker = 29" from front wall/axially centered (port fully open)
==FIG 2==
In room response (Pink = left speaker Blue = right speaker)
==FIG 3==
Corrected L+R response (Blue = corrected Orange = original)
==FIG 4== Roon signal path
Here are some questions I'm contemplating. Would be great to hear any recommendations -
(1) Will adding miniDSP to the signal chain degrade sound significantly? I see the chips have similar specs so I'm hoping they would be equivalent.
miniDSP => ADSP21489 => 115 DR 107 S/(N+D)
UDP-203 => AK4458VN => 115 DB SNR THD+N: -107dB
(2) Is having port bung only on one side recommended? I haven't heard of this but it does make the L and R responses much closer.
(3) I read about phase corrections in addition to filters but I'm not making much progress understanding how to do it. Is this needed?
(4) I only used negative EQ parameters but it appears the response has been normalized. I was getting clipping as a result so I turned on volume normalization in Roon. I don't understand how DSP works but is it effectively converting my filters to +ve EQ? I'm wondering if that might result in wasting amp power trying to fill in the response dip between 50-100 hz
:::: LEFT filters ::::
Filter 1: ON HSQ Fc 90.00 Hz Gain -1.80 dB Q 1.00
Filter 2: ON PK Fc 122.0 Hz Gain -2.00 dB Q 4.139
Filter 3: ON PK Fc 199.5 Hz Gain -3.00 dB Q 2.000
Filter 4: ON PK Fc 590.0 Hz Gain -3.40 dB Q 5.312
Filter 5: ON HSQ Fc 1000 Hz Gain -1.00 dB Q 1.00 (tweaked house curve)
Filter 6: ON HSQ Fc 3000 Hz Gain -0.50 dB Q 1.00 (tweaked house curve)
Filter 7: ON HSQ Fc 4000 Hz Gain -1.00 dB Q 0.500 (tweaked house curve)
Filter 8: ON PK Fc 1150 Hz Gain -1.50 dB Q 5.000 (tame presence brightness)
:::: RIGHT filters ::::
Filter 1: ON HSQ Fc 100.0 Hz Gain -2.00 dB Q 1.00
Filter 2: ON PK Fc 137.0 Hz Gain -5.00 dB Q 7.320
Filter 3: ON PK Fc 161.5 Hz Gain -2.00 dB Q 8.131
Filter 4: ON PK Fc 204.0 Hz Gain -4.50 dB Q 7.000
Filter 5: ON PK Fc 561.0 Hz Gain -5.50 dB Q 3.000
Filter 6: ON HSQ Fc 1000 Hz Gain -1.00 dB Q 1.00 (tweaked house curve)
Filter 7: ON HSQ Fc 3000 Hz Gain -0.50 dB Q 1.00 (tweaked house curve)
Filter 8: ON HSQ Fc 4000 Hz Gain -1.00 dB Q 0.500 (tweaked house curve)
Filter 9: ON PK Fc 1150 Hz Gain -1.30 dB Q 5.000 (tame presence brightness)
Cheers!
Attachments
Last edited: