KLH Model 33 (1964–1968)
A vented 2-way loudspeaker system from KLH’s early years, noted for smooth, fatigue-free sound and good dispersion.
Overview
The KLH Model 33 is a 2-way loudspeaker system produced from 1964 to 1968, during the formative years of the KLH brand. Unlike the company’s earlier acoustic suspension designs, the Model 33 features a vented cabinet with a 2-inch diameter front-mounted ducted port, marking a departure in engineering approach. It was praised for its warm, balanced sound, particularly well-suited to vocal and acoustic recordings, with good treble response and wide dispersion that made for easy long-term listening without fatigue.
Specifications
| Product type | Loudspeaker System, 2-Way Loudspeaker System |
| Impedance | 8 Ohms |
| Dimensions | 23-5/8" x 12-3/4" x 10-15/16" |
| Weight | 33 Pounds |
| Design | Vented design with 2-in. diameter ducted port in front |
Design
The Model 33 departs from KLH’s conventional acoustic suspension approach by incorporating a 2-inch diameter ducted port in the front of the cabinet, enhancing bass response through vented alignment. A schematic for the crossover network is available, and original units likely contain carbon composition resistors that may require replacement during restoration.
Context
Launched just a few years after KLH’s founding in 1957, the Model 33 emerged during a transformative period in consumer audio, reflecting the company’s evolving design philosophy. It represents an early experiment with ported enclosures in a market increasingly interested in extended bass performance.
Market
Used units have been listed for prices around $24 to $25 in recent thrift or resale settings, though cabinet condition is often poor and may require full refinishing. Replacement of aged crossover components, particularly carbon comp resistors, is a common maintenance step for operational restoration.
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