LP for EQ

[AdamFrandsen]

I am in the process of designing a 12 band LC EQ for the analogue side of my setup - between phono stage and preamp (MiniDSP is used before the DAC), and I am looking for an LP with sweeps/test tones etc., so I can still do the measurements with my UMIK 2 for setting the EQ. I haven’t had any luck so far browsing the net, maybe some of you know of one. Thanks in advance! -A

 

[staticV3]

@stereoplay compared a bunch of different test records in this thread:

Frequency Response Test Records

Frequency Response Test Records I was wondering how my few test records measure compared to each other and which one is the best for measuring crosstalk. Used Pickup: Ortofon Vinyl Master Silver (47K//240pF, 17,5mN) Used Turntable: Mitsubishi LT-20 First I adjusted the pickup exaktly...

www.audiosciencereview.com

 

[DVDdoug]

This "APPENDIX" post lists 3 test records (which may be out-of-print but still available).

You can also just Google "vinyl test record". It looks like Ortofon still makes one, which presumably they use to test their cartridges.

P.S.
Records vary, and I'm sure the test records vary too. So, I'm not sure it's worth all the trouble. You are probably better-off EQ-ing by-ear for whatever "sounds good", and maybe differently for different recordings.

 

[AdamFrandsen]

Wonderful, sorry for missing that

 

[staticV3]

That being said, you're gonna have to play around with REW's RTA settings to get acceptable results using foreign sweeps.

I haven't tried this yet as I could always use pink noise or REW's own measurement sweep as stimulus.

 

[MCH]

Just curious, and sorry if I am missing something obvious. Any reason why you can't unplug your phono stage and use a dac just for the measurements? I guess a cheap dongle or whatever you have at hand can do the job and might be easier and cheaper than procuring a test record.

 

[AdamFrandsen]

Just curious, and sorry if I am missing something obvious. Any reason why you can't unplug your phono stage and use a dac just for the measurements? I guess a cheap dongle or whatever you have at hand can do the job and might be easier and cheaper than procuring a test record.

I can use an ADC for measuring the signal itself, but not how it sounds at my listening position - I also cannot play the dac through my phono stage or account for any characteristics of the turntable itself with the dac.

 

[MCH]

I can use an ADC for measuring the signal itself, but not how it sounds at my listening position - I also cannot play the dac through my phono stage or account for any characteristics of the turntable itself with the dac.

Probably I am not following. What I mean is to use a dac to generate the analog sweep from a computer instead of using a test record. You would still use the rest of the system and measure with the microphone from the listening position.

 

[levimax]

I am in the process of designing a 12 band LC EQ for the analogue side of my setup - between phono stage and preamp (MiniDSP is used before the DAC), and I am looking for an LP with sweeps/test tones etc., so I can still do the measurements with my UMIK 2 for setting the EQ. I haven’t had any luck so far browsing the net, maybe some of you know of one. Thanks in advance! -A

Test records are all flawed to a greater or lesser degree. See link below for a discussion of some test records. The thread from the beginning contains a lot of information you might find useful. In my case I used a test record to measure the response of my TT system with the script. This is going to be a lot more accurate than trying to measure the output with a Microphone. From the script I create a FIR filter to adjust the TT output and I use a Mic and REW to measure the rest of the system (speakers and room) with accurate test tones for EQ.

Phono Cartridge Response Measurement Script

This thread is intended to consolidate the technical discussion and further development of Scott Wurcer's frequency response measurement script to a central area. I'd like to keep this discussion about the tool rather than specific cartridges. I'll edit this and the subsequent reserved posts in...

audiosciencereview.com

 

[AdamFrandsen]

Probably I am not following. What I mean is to use a dac to generate the analog sweep from a computer instead of using a test record. You would still use the rest of the system and measure with the microphone from the listening position.

Yes, I understand:

Digital part of my system: Mono block power amps, preamp, dac, dsp, streamer, source
Analog part of my system: Mono block power amps, preamp, equaliser, phono stage, pickup, turntable, lp source

If I measure with a DAC only, it wont take into account the sound characteristics of the analogue side (phono stage, pickup, turntable). If I run the analogue signal through an ADC and use that to measure, I wont get the sound of my listening position. What I will do is likely both, record the signal to my computer through an ADC and also take measurements with the mic at listening position and then compare to get a fuller picture, before using the eq.