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  3. 193535-21731

Speakers for Graaf GM 20 OTL

I am asking for help selecting speakers for my GRAAF GM 20 OTL power amplifier

18 watts

output transformer less 

price was something like 2700 U.S. $ nearly 20 years ago my guess.

monitors or full range.

 In Own 2 subwoofers and equalization units by Velodtne although the subs have auto eq, , app, balanced unprocessed input FOR USE WITH THE EQUALIZERS.

price point? the price AND OR QUALITY of the amps SHOULD rule the class of speakers. 

perhaps 1000 to 3000 but something reasonable.

i have  excellent Audio-GD DAC AND TUBE preamp

thransport so far sony 800mk2 blue ray.

thanks for your interest in helping.

I AM MOVING SO DO NOt know room size but perhaps 15 feet by 20 to 25 feet ceiling may be sloped so larger volume than usual.

alanpiga
verdantaudio's avatar
verdantaudio
1,515 posts
 

 I have a customer who runs these amps.  He has had great success with Audiovector and Fyne.  Obviously you need to find speakers that are a bit more efficient and if you can get to 92 or 95 decibels efficiency you will have good results.  

Full disclosure, I am an Audiovector dealer.  I have no relationship with Fyne

atmasphere's avatar
atmasphere
12,003 posts
 

@alanpiga Low power OTLs work best with speakers of higher impedance. 16 Ohms usually works a lot better than 8 Ohms.

If you are not planning on very high volumes, the famous BBC-designed LS35a is a 15 Ohm load and plays very nicely with amps like yours. Seems to me Rogers, Spendor, Musical Fidelity and others make this design.

I run a pair of Classic Audio Loudspeakers model T3s which are 16 Ohms, 98dB and flat to 20Hz. An amp like yours can shake the room with the right source material. 

We've had very good luck with the higher impedance DeVore Fidelity loudspeakers like the O/96.

Of course there are a number of 'full range' drivers that are 15 or 16 Ohms like Lowther, PHY and the like but none of them are full range and if you want the most out of them should really be treated as a very wide range midrange driver, so a tweeter and a real woofer should be part of such a system.

If you can find a set, Spatial Audio made a speaker called the X3 that was 16 Ohms. A lot of our customers using our S-30 amplifier had very good success using them (The S-30 is our smallest OTL).

If you keep your eyes open you can find other 16 Ohm speakers. Good Luck!

 

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