Marantz PM6007 with DALI Oberon 5: are 45 watts enough for a floorstander?
The first suggestion German search makes on this amplifier, and the answer is 93.7 dB at three metres — enough for the room, 11.3 dB under cinema reference. The pearl is that the Denon PMA-600NE everyone compares it with computes to the same number, to the decimal.
Signal Chain Compatibility Matrix
Select gear and parameters for live gain, impedance and SPL calculations.
Input Equipment Setup
PASS: Optimal Signal Chain
Requires minimum +60dB of clean pre-amp gain. Most budget entry interfaces max out at +50dB to +56dB and introduce hiss at max pot. An inline preamp booster (Cloudlifter CL-1 / FetHead) is strongly recommended.
The interface preamp provides sufficient headroom.
$538
$405
-25%Tonal & acoustic characteristics: Flat, wide-range frequency response for clean music and speech. Smooth, warm acoustic character with air-suspension shock isolation.
Technical advisory: With +69dB max gain, the Gen 4 Solo can drive demanding dynamics like the Shure SM7B natively without requiring an external inline booster.
Physical Interconnect Topology
Shure SM7B
Direct Cable Connection (No Intermediate Box)
1x Shielded Balanced XLR Cable (3-Pin XLR Male to XLR Female)
Focusrite Scarlett Solo (Gen 4)
Host: Apple MacBook Pro (M1/M2/M3/M4)
93.7 dB at three metres — and the Denon most people compare it with gives exactly the same number.
Level. 88 dB at 2.83 V/1 m on a 6 Ω nominal load is 86.75 dB per watt. The PM6007 publishes 45 W at 8 Ω and nothing at 6, so the calculation uses the 8 Ω figure:
| Distance | Continuous SPL | Against 105 dB | |---|---|---| | 1 m | 103.3 dB | −1.7 dB | | 2 m | 97.3 dB | −7.7 dB | | 3 m | 93.7 dB | −11.3 dB | | 4 m | 91.2 dB | −13.8 dB |
How much amplifier would close the gap. Going from 93.7 dB to the 105 dB reference at three metres is 11.3 dB, which is 13.5 times the power: 607 W. Moving the chair from three metres to two buys 3.6 dB and costs nothing. That is the honest shape of the answer to «should I get a bigger amplifier» — the room is a cheaper variable than the amplifier by two orders of magnitude.
The pearl: the Denon PMA-600NE gives 93.7 dB too, the same number to the decimal. Both publish 45 W at 8 Ω, and for a 6 Ω speaker neither publishes anything else, so both pages compute from the identical figure. German search suggests these two amplifiers against this speaker as if the choice were about level; for the level question they are one amplifier. The Denon does print a second number — 70 W at 4 Ω — but at 0.7 % distortion against the 0.07 % of its 8 Ω rating, and our calculation will not reach for a 4 Ω figure on a 6 Ω nominal load. Where the two genuinely differ is in everything a level calculation cannot see.