Themabewertung:
  • 0 Bewertung(en) - 0 im Durchschnitt
  • 1
  • 2
  • 3
  • 4
  • 5
Suche Testschallplatte mit Frequenz-Sweep
#1
Ich möchte den Frequenzgang verschiedener Abtastsystem messen und vergleichen. Insbesondere möchte ich damit herausfinden, wie sich der Nachbau des Merula SK451 im Vergleich zum Original schlägt. Dafür habe ich aus einem alten Plattenspieler einen Testaufbau konstruiert, auf dem ich leicht verschiedene Abtastsysteme montieren kann:     

Das Signal des Systems wird impedanzgewandelt, am PC digitalisiert und dann mit Audacity analysiert. Das funktioniert soweit schon ganz gut, aber ich habe ein Problem: Meine Ortofon-Testschallplatte hat zwar einen schönen Frequenz-Sweep drauf, der geht aber leider von 800Hz bis 50kHz. Was mir dabei fehlt ist natürlich der wichtige Bereich unterhalb von 800Hz. Keine Ahnung was sich die Produzenten dieser Platte dabei gedacht haben, anstelle des wichtigen unteren Frequenzbereichs den Bereich bis hin zu 50kHz abzudecken. Vielleicht beschäftigen die sich primär mit Fledermäusen...

Daher die Frage: Kennt jemand eine Testschallplatte, die einen Frequenz-Sweep auch schon ab einer geringeren Frequenz hat? Bei meiner Recherche bin ich bislang nur auf Testplatten gestoßen, bei denen sich die Hersteller stolz damit brüsten, auf so etwas nutzloses wie Frequenz-Sweeps verzichtet zu haben...

Schöne Grüße
Markus
Zitieren
#2
Hallo Markus,
such doch mal danach: "Hi Fi News Analogue Test LP".

Hier der Inhalt...

SIDE ONE
Track 1: Channel Identification: Voice on Left channel then on Right channel
Reversing left and right channels is one of the most common mistakes in an analog rig. If the channels are reversed, imaging, depth and dynamic range suffer. This track ensures the most basic test for a high performance system is covered.

Track 2: Phasing: Voice alternately "in phase" and "out of phase"
Reversing the cartridge leads is the second most common mistake made in an analog rig. Miswiring the phase at the cartridge destroys imaging, space, depth, bass extension and overall system gain. This track offers easily audible cues to highlight phase inaccuracies.

Tracks 3, 4, 5: Channel Balance: -20db pink noise tests
These three tracks provide mid-range weighted random noise to ensure tonal balance is set correctly. When listening, neither the left nor the right speaker should be louder. Track 3 is pink noise in both channels, Track 4 is Left only and Track 5 is Right Only. Check these tracks before moving on to the Bias tracks. (NOTE: Test Cut 4 and 5 for use with the Fozgometer Azimuth Device)

Tracks 6, 7, 8: Bias setting: 300Hz tone, both channels at +12dB, +14dB, +16dB, respectively
These tracks are for setting anti-skate. If the 300Hz test tone is heard distorting or buzzing on either channel, then the anti-skate function needs to be adjusted. Each successive track is more difficult for the arm and cartridge; increasing tracking force towards the top of the cartridge's recommended range will assist in properly resolving these tracks.

Track 9: Bias setting: 300Hz tone, both channels +18dB
This track stands alone as perhaps the most difficult track for a cartridge to track cleanly. Although it's only 2dB higher than track 8, this track is perhaps the most famous of the four, as only the very best gear and alignments can pass it unscathed. For those with more modest gear, results from this track should be taken with a grain of salt.

SIDE TWO
Tracks 1, 4, 8: Tracking ability: 300Hz tone, both channels +15dB
These three tracks contain identical information, which enables testing of the consistency of the cartridge's track across the entire surface of the record. These tracks - outside, middle and center - are designed to be used together, making sure that the cartridge sounds the same in all three positions. These tracks are also great for checking anti-skate and tracking force settings. Consistency is the key with these three tracks, if all three are spot-on, then most records should sound great.

Tracks 2 & 3: Cartridge & Arm, Lateral & Vertical Resonance Test
These two tracks are used to test the resonant frequency or your tonearm and cartridge combination in both the vertical and horizontal domains. These tracks offer both a visual and auditory indication of the resonant frequency; the stylus will "wobble" and the test tone will warble. A resonant frequency between 8 - 15Hz is ideal.

Track 5: Cartridge alignment test: 300Hz, both channels +6dB
Ideal playback occurs when the stylus is exactly perpendicular to the record, this track tests the cartridge's azimuth adjustment. When this track is played back in stereo, there will be identical output from both speakers, however, when the output is switched to mono, both tracks should cancel each other out for, ideally, no output.

Track 6: Residual System Noise Test
There's nothing in this groove, this track is completely unmodulated. Played back at normal listening levels the stylus will highlight any noise created by the analog rig; a worn bearing, noisy motor or poor vibration control. Playback of this track should be completely silent.

Track 7: Full Range Frequency System Check: Both Channels, 20Hz -20KHz, Sweep
This track will give your system a real workout, as the deepest bass swells up to the highest of highs. Listen carefully for resonance within the system and in the room.


Beste Grüße
Mario
Zitieren
#3
Der letzte Track auf der zweiten Seite ist genau das was ich gesucht habe - perfekt! Besten Dank, Mario!

Schöne Grüße
Markus
Zitieren


Möglicherweise verwandte Themen…
Thema Verfasser Antworten Ansichten Letzter Beitrag
  Die Testschallplatte Grießgram 5 2.188 17.01.2020, 22:58
Letzter Beitrag: hardware.bas

Gehe zu: