Cloudschatze
Veteran Member
Here's something that 99.9% of you guys won't have any interest in, but that Dan Tsatsanis asked about in the recent Tandy 2500 RSX thread.
Original WAV:
Asia - "Aqua, Pt. 1" (excerpt)
Per Frank Durda IV, and the recorded example and diagram below, a normal PSSJ has a fixed roll-off output filter that attenuates frequencies above ~5 KHz.
Tandy 1000 TL/2:
Asia - "Aqua, Pt. 1" (excerpt)
The first-model Sensation! on the other hand, appears to have a (ridiculous) roll-off value of ~1 KHz.
Tandy Sensation!:
Asia - "Aqua, Pt. 1" (excerpt)
I'm not entirely positive, but I suspect the additional filtration in the Sensation! is likely due to the built-in telephony functions. That is, that either the PSSJ DAC is being filtered for use with the answering-machine functionality, or that the output from both the PSSJ and modem is multiplexed and then filtered (presumably for the benefit of the latter) into a single "mixer" input.
And yes, the filter affects all PSSJ output, including that of the PSG:
Tandy 1000 TL/2:
Conquests of Camelot - "Gwenhyver" (excerpt)
Tandy Sensation!:
Conquests of Camelot - "Gwenhyver" (excerpt)
This isn't an effort to make the Sensation! look bad, mind you, since the output from its Yamaha MMA chipset (both DAC and OPL3) sounds fantastic; it's just not an ideal model if you're looking for that classic "Tandy" sound.
Original WAV:
Asia - "Aqua, Pt. 1" (excerpt)
Per Frank Durda IV, and the recorded example and diagram below, a normal PSSJ has a fixed roll-off output filter that attenuates frequencies above ~5 KHz.
Tandy 1000 TL/2:
Asia - "Aqua, Pt. 1" (excerpt)
The first-model Sensation! on the other hand, appears to have a (ridiculous) roll-off value of ~1 KHz.
Tandy Sensation!:
Asia - "Aqua, Pt. 1" (excerpt)
I'm not entirely positive, but I suspect the additional filtration in the Sensation! is likely due to the built-in telephony functions. That is, that either the PSSJ DAC is being filtered for use with the answering-machine functionality, or that the output from both the PSSJ and modem is multiplexed and then filtered (presumably for the benefit of the latter) into a single "mixer" input.
And yes, the filter affects all PSSJ output, including that of the PSG:
Tandy 1000 TL/2:
Conquests of Camelot - "Gwenhyver" (excerpt)
Tandy Sensation!:
Conquests of Camelot - "Gwenhyver" (excerpt)
This isn't an effort to make the Sensation! look bad, mind you, since the output from its Yamaha MMA chipset (both DAC and OPL3) sounds fantastic; it's just not an ideal model if you're looking for that classic "Tandy" sound.
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