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McCormack DNA .5? Do I need more power?

Hi. I have been thinking about picking up a used McCormack DNA 0.5, which I may upgrade in the future. Will it be powerful enough at only 100w? I am currently using a B&K Reference 4420 (225wpc) and while it sounds good, I am sure I will get better sound out of the McCormack, especially once upgraded. My speakers are 91db, pretty efficient, but they have a big 10" driver along with a 6.5" driver, 1" driver, and tweeter, so I don't want to under-power them. Manufacturer recommends no less than 30w. I don't play real loud (no higher than 10 o'clock, which is plenty), but I don't want the lows to be muddled by a lack of power. What do you think?
chiho
leigh
12 posts
 
I use a Rev A modded DNA .5 to drive Spendor 9/1 3-way speakers which have a 12" woofer. I think the speakers have an efficiency of 89 db SPL. Another consideration is the match of the amp with your preamp. The SMcAudio revisions make a sweet-sounding amp even better. JimL
ptmconsulting
1,000 posts
 
It's more a matter of efficiency and impediance than raw power wattage. Your speakers are pretty efficient at 91db, and I'll bet they are considered 4 ohm's. That makes the McCormack a 200 watt amp into 4 ohms.

Plenty of power there to control your woofer. The McCormack's are also known for their tight and tuneful bass, so I wouldn't think you would have a problem.

And yes, the upgrades steve offers are not to be dismissed lightly. If you like the DNA .5 in its stock form you will be amazed at a Rev A or B unit. Never to upgrade again is what most of us think of those mods.

Enjoy,
Bob
eagleman6722
217 posts
 
I have Vandersteen 2CE Signatures @ efficiency of 86DB. I had the B&K 4420 driving them but moved to a McCormack DNA-1. 150 channel into 8 but probably running close to 200 because the Vandys are 7 ohms I think. The unmodded DNA-1 provides plenty of power with more to spare so I think your 91 DB spendors would mate well with the DNA .5 as long as your room isn't too big and you are not looking to blow the roof off your house....

Eagleman
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