IMF ALS30 - Retrotech Audio - Vintage Audio

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IMF Studio ALS30
1970's Vintage British Monitors


IMF Studio ALS30

1970s Vintage British Monitors

Listening to these illustrates how many expensive contemporary designs are really ‘Emperor’s New Clothes’, where appearance trumps audio integrity.

You will never see an original pair of loudspeakers from the early IMF range which do not have foam rot around the mid-range drivers - and these were no exception. So…… we have had these drivers expertly re-foamed with the correct surrounds. Consequently they now sound as delicious as the day they were born all those years ago.

A mirror image pair, factory matched, with serial numbers 1028 L & R. Not only are these in full working order, they are also in really nice physical condition - a real credit to their very fussy original owner (see close-up pictures).

The following information and specifications are from the IMF website:

“Medium sized speaker, 3 way, Active Transmission Line.

The ALS 30 is our smallest Active Line speaker incorporating two dissimilar six-inch bass units. It's mid-range driver and dome tweeter are identical to those in the ALS 40.”


• 57cm high x 28cm deep x 30cm wide

Drive Units:

• 6 1/2" 16.5 cm ribbed bextrene bass unit
• 6 1/2" 16.5 cm bextrene sub-bass unit
• 4" 10cm rolled surround impregnated cone mid-range with domed tweeter


• Electrical four way at 250 Hz, 450 Hz and 3.5 kHz
• Frequency Range: 29 Hz 20 kHz
• Matching Impedence 4 - 8 ohms
• Efficiency Measured via Pink Noise at 1 metre on axis for 40 watts: 99dB
• Driving Power Requirements: 25 - 50 watts
• Nett Weight (each): 16 kgs
• Gross Weight Packed (pair): 38 kgs


Payment accepted via Credit/Debit Card, PayPal, Bank Transfer, Personal Cheque or cash on collection.

Economical worldwide shipping via UPS or FedEx - Expertly packed, tracked and insured.


Please contact us either by telephone on 01883 340073
or by sending and email to
if you are interested in purchasing this item.


Linn, Quad, Tannoy, Revox, Arcam, Musical Fidelity, SME, Rogers, Spendor, Garrard, Leak, Thorens, KEF, Meridian, Lecson, Mission, Michell, Sudgen, Nakamichi, Radford, Armstrong, Bowers & Wilkins, Celestion, Exposure, Gale, IMF, Beard, Audio Innovations J.R., Etc…etc…

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