1973 Utah 8" Guitar Speaker in Vintage Soundesign 620 Cabinet – 8Ω

Built by Retrovox Vintage Audio, this custom passive guitar extension cabinet combines a vintage Soundesign 620 acoustic-suspension speaker enclosure with a carefully selected 1973 Utah 8-inch American-made speaker. The result is a warm, responsive vintage cabinet with smooth mids, balanced highs, natural paper-cone compression, and excellent articulation for low-powered guitar amplifiers.

The cabinet retains its original walnut-look finish and original cabinet construction while receiving new vintage-style grille cloth for a clean, period-correct appearance. A standard 1/4-inch mono speaker input provides reliable compatibility with modern guitar amplifiers.

The original OEM speaker was evaluated during testing but ultimately replaced after comparison with several vintage American drivers. The installed Utah speaker proved to be the strongest overall match, producing fuller mids, smoother breakup, tighter bass, and a more musical response while preserving the lively character of the sealed enclosure.

The Utah driver carries EIA code 328346, identifying it as an original Utah-built American speaker manufactured during the 46th week of 1973. Vintage Utah speakers are known for their balanced frequency response, smooth paper-cone character, and natural compression that pairs exceptionally well with blues, classic rock, garage rock, indie, harmonica, and recording applications.

During evaluation, this cabinet delivered a warm, balanced voice with controlled bass, smooth highs, and excellent note definition. The sealed enclosure keeps the low end tight while allowing the Utah speaker to produce natural vintage dynamics that work equally well with clean tones, edge-of-breakup sounds, overdrive, and fuzz.

Features:

• Vintage Soundesign 620 cabinet
• Vintage Utah 8-inch American-made speaker
• EIA code 328346 (46th week of 1973)
• 8-ohm impedance
• New vintage-style grille cloth
• Walnut-look cabinet
• Standard 1/4-inch mono speaker input
• Passive extension cabinet
• Tested and working

This cabinet is intended for lower-powered tube and solid-state amplifiers where the vintage Utah speaker can be enjoyed within its intended operating range. It pairs especially well with Fender Champ and Vibro Champ amplifiers, Hotone Nano models, Orange Micro Terror and Micro Dark heads, Joyo Bantamp amplifiers, Quilter MicroBlock and InterBlock units, Bogen conversions, and similar compact amplifiers.

The cabinet is in very good vintage condition with normal cosmetic wear consistent with age. The refreshed grille cloth, original cabinet, and carefully selected vintage Utah speaker create a distinctive extension cabinet that combines vintage aesthetics with reliable modern usability.

A YouTube sound demonstration of this exact cabinet is included in the listing so you can hear its response and tonal character before purchasing.Built by Retrovox Vintage Audio, this custom passive guitar extension cabinet combines a vintage Soundesign 620 acoustic-suspension speaker enclosure with a carefully selected 1971 Utah 8-inch American-made speaker. The result is a warm, responsive vintage cabinet with smooth mids, balanced highs, natural paper-cone compression, and excellent articulation for low-powered guitar amplifiers.

The cabinet retains its original walnut-look finish, original cabinet construction, and has been fitted with new vintage-style grille cloth that complements the mid-century appearance while giving the cabinet a clean, refreshed presentation. A standard 1/4-inch mono speaker input provides compatibility with modern guitar amplifiers.

The original OEM speaker was evaluated during testing but ultimately replaced after comparison with several vintage American drivers. The installed 1971 Utah speaker proved to be the strongest overall match, producing fuller mids, smoother breakup, and a more musical response while preserving the lively character of the sealed cabinet.

The Utah driver carries EIA code 328346, identifying it as an original Utah-built American speaker manufactured during the 46th week of 1973. Vintage Utah speakers are known for their balanced frequency response, smooth paper-cone character, and natural compression that pairs exceptionally well with blues, classic rock, garage rock, indie, harmonica, and recording applications.

During evaluation, this cabinet delivered a warm, balanced voice with tight low end, smooth highs, and excellent note definition. The sealed enclosure keeps the bass controlled while allowing the Utah speaker to produce natural vintage dynamics that work equally well with clean tones, edge-of-breakup sounds, overdrive, and fuzz.

Features:

• Vintage Soundesign 620 cabinet
• Vintage Utah 8-inch American-made speaker
• EIA code 328346 (46th week of 1973)
• 8-ohm impedance
• New vintage-style grille cloth
• Walnut-look cabinet
• Standard 1/4-inch mono speaker input
• Passive extension cabinet
• Tested and working

This cabinet is intended for lower-powered tube and solid-state amplifiers where the vintage Utah speaker can be enjoyed within its intended operating range. It pairs especially well with Fender Champ and Vibro Champ amplifiers, Hotone Nano models, Orange Micro heads, Joyo Bantamp amplifiers, Quilter MicroBlock and InterBlock units, Bogen conversions, and similar compact amplifiers.

The cabinet is in very good vintage condition with normal cosmetic wear consistent with age. The refreshed grille cloth, original cabinet, and carefully selected vintage Utah speaker create a distinctive extension cabinet that combines vintage aesthetics with reliable modern usability.

A YouTube sound demonstration of this exact cabinet is included in the listing so you can hear its response and tonal character before purchasing.