Siblings in OSD's Black series, so they share a family sound. It comes down to size, output and price.
| Area | Better | Why |
|---|
| Bass | A | OSD Black Series SC800D digs deeper - 40Hz against 65Hz. |
| Amplifier match | A | OSD Black Series SC800D is the easier load at 8 ohms; the other is 4 ohms and wants an amplifier rated for it. |
| Price | A | OSD Black Series SC800D is cheaper - $300 against $1,800, about 83% less; arguably a different class. |
A OSD Black Series SC800D B OSD Black Series T69 MKII
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
OSD Black Series SC800D is the easier recommendation: it leads on most of the measured areas and costs less. Take OSD Black Series T69 MKII if its size, looks or fit in your room suit you better. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 65Hz anyway, so judge these on the other rows instead. If your amplifier is modest, vintage or valve-based, OSD Black Series SC800D is the safer partner - the other will want more current or more watts to sound its best.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.