Đĩa LP Analogue Productions The Ultimate Analogue Test LP 200g

Mã sản phẩm: 753088700118
Nhà sản xuất: Đang cập nhật

Features: • 200g Virgin Vinyl • Pressed at Quality Record Pressings Selections: Side 1 General Reference Level This 1 kHz reference tone will allow you to establish a “base level” for all measurements. Track 1. 1Khz reference tone 7cm/s lateral in phase (mono) Basic reference for all measurements, adjust meter for maximum convenience (in the studio 0VU). Adjust preamp channel balance for equal output. Also used to check the offset angle of the photo cartridge; L&R signals should be exactly in phase as displayed on an oscilloscope. Azimuth Adjustment Track 2. 1kHz reference level, Left channel only Measure Right channel output. Track 3. 1kHz reference level, Right channel only Measure Left channel output. The object is to sit the stylus exactly perpendicular in the groove. Twist cartridge about its radial axis until the measurements from Track 2 and Track 3 are equal or very close to equal for both channels. High Frequency Adjustment Tracks 4-6 are used to calibrate the RIAA high frequency equalizer of a phono preamp. This will be used to calibrate a mastering lathe’s phono preamplifier or any phono preamplifier that has these adjustments. Track 4. 1 kHz tone at -20db below reference level, Lateral Reference for High Frequency test. Track 5. 10 kHz reference tone at -20db, Lateral Adjust the high frequency until the output level equals that of Track 4. Track 6. 1 kHz to 20 kHz sweep at -20db, Lateral The AC millivolt meter reading should stay constant across all frequencies. There are a number of factors which can affect frequency response, including cable capacitance, cartridge loading, tracking force and worn parts. Because of this, it can be difficult to achieve perfectly flat frequency response. Sometimes by making small compromises in the 10 kHz adjustment, a better overall frequency response can be achieved. Low Frequency Adjustment Tracks 7 & 8 are used to calibrate the RIAA low frequency equalizer of a phono preamp. Track 7. 1 kHz to 20 Hz sweep at 0VU (Lateral) Play Track 7 and measure the output with your AC millivolt meter. Ideally, the output will be flat across all frequencies. When viewed on an oscilloscope, the amplitude would remain constant during the frequency downsweep. Track 8. 100 Hz reference tone at 0VU (Lateral) Adjust LF Eq to reference (which is your reading from Track 1). Track 9. VTA adjust This is an IEC intermodulation distortion (IMD) test signal; 60Hz & 4kHz 4:1 ratio. Using an IMD tester, adjust VTA by raising or lowering the tonearm for minimum distortion. Track 10. Standard Wow & Flutter test signal; 3150Hz The Wow & Flutter meter will give dynamic speed variations as a percentage deviation from nominal. Also, the frequency counter should read exactly 3150 Hz for nominal speed. You can use the Hz function on your multi-meter (if so equipped) to verify speed here as well. You can also use to find the measurements at 45RPM. The correct reading at 45RPM would be 4253 Hz (45/33.33) x 3150. Side 2 Track 1. Anti-skating test; 315Hz amplitude sweep to +12db (Lateral) Signal should remain clean in both channels up to the highest level, both audibly and as viewed on an oscilloscope. In case of distortion, increase anti-skating force or decrease anti-skate until breakup occurs equally in both channels. The left channel information is inscribed on the inner groove wall, the right channel information, on the outer groove wall. Because of the offset angle of a pivoted tonearm, a constantly varying vector force biases the arm towards the center of the record causing the stylus to lose contact with the outer (i.e. right channel) groove wall. Both linear and modulated groove velocity, tracking force, stylus profile, and vinyl composition are contributing factors. The anti skating force attempts to ameliorate this by applying an opposing similar force. It is also accepted that the overall force vector increases as the tonearm approaches closer to the spindle or end of the record. Track 2. Pink noise lateral Track 3. Pink noise vertical Used for cartridge “demagnetizing” You can also use this track to loosen up the cantilever’s suspension to help break in a new cartridge. Play these tracks five to ten times after every 300 hours of normal LP playback. Track 4. 1kHz at reference level, vertical This out-of-phase signal should cancel to nothing when summed to mono. Any signals still present are distortion artifacts, lack of channel balance, or timing (phase) anomalies. This test can be a second confirmation of anti-skate adjustment. Track 5. 1kHz to 10Hz sweep at -20db below reference level, vertical Resonance anomalies in the tonearm / cartridge interface will show up as amplitude peaks and dips as the frequency sweeps down. Once again, by listening in ‘Mono’ it is easier to hear the distortion artifacts. Track 6. Silent groove for bearing rumble and table isolation During playback of this track, nothing should be transmitted from the turntable to the speakers. Replay the track and gently tap on the rack or base that the turntable is resting on. There should be little or no thump transferred to the speakers. This track will help you experiment with turntable isolation methods and products to be able to get the most out of your playback system. You may want to use a closed or sealed headphone for best listening results, or a stethoscope on the plinth.

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