Mystery Beovox M70 (Type 6304): Right-aligned drivers

[Martin PV]

Hi everyone,

I recently acquired a pair of Beovox M70s (Type 6304) and started restoring them. I’m a big fan of vintage hi-fi and the engineering behind these classic B&O speakers.

I just finished a full recap of the crossovers, and I have to say, the sound is absolutely fantastic! The bass is tight and balanced, and the vocals and string instruments are incredibly clear and realistic. They are a joy to listen to.

However, I’ve stumbled upon a bit of a mystery with my pair that I hope the experts here can help me solve.

As far as I know, all standard Beovox M70s have their tweeter and mid-range drivers offset to the left side of the front baffle to minimize diffraction. But on my speakers, the drivers are offset to the right.

I have never seen them sold as acoustically mirrored pairs (Left/Right), and every brochure or picture I can find online shows the left-aligned version.

Here are the details of my pair:

• Model: Beovox M70 (Type 6304)
• Serial Number: 1366002
• Driver Date Stamp: The SEAS 25F-EWRX (H131) woofer is ink-stamped “4 21/77”, placing its production in week 21 of 1977. So this was right in the middle of the main production run.
• Crossover Note: Interestingly, the crossover features a factory-fitted 2.2 µF Evox MMK film capacitor on the tweeter circuit instead of the standard bipolar electrolytic (Wico/ROE) usually found in mass-produced M70s.

Does anyone have any information or knowledge about this right-aligned version?

Could this simply be a CNC-routing error / production anomaly at the factory in Struer that slipped through Quality Control, or perhaps a special edition or experiment?

I have attached pictures of the front baffle and the Evox capacitor.

Any insights into the history of this specific production run would be greatly appreciated!

 

Best regards,

Martin

[Dillen]

I have seen both left and right aligned models.
Definitely most left.
It’s not that at some point mirrored pairs were sold. No, they are always found in pairs, either both left or both right.
Why, I cannot say.

Martin

[Author]

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