Vintage Bose 901 Series IV Speakers ad - High Fidelity 12/1978.
(NOTE: Purchase 3 of my Vintage Stereo ads from High Fidelity Magazine and get the lowest priced one for free. Either request an invoice before paying, or if you pay for all 3 I will refund you the lowest priced one. Of course I'll combine shipping as well.)
Please see my other vintage stereo magazine ads from the High Fidelity magazine.