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 built from 1964 to 1968, in the early years of the KLH brand. KLH's earlier designs were acoustic suspension. The Model 33 is vented instead, with a 2-inch diameter ducted port on the front of the cabinet. Reviewers praised its warm, balanced sound, especially on vocal and acoustic recordings. Treble response was good and dispersion was wide, so it was easy to listen to for a long time 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 2-inch diameter ducted port in the front of the cabinet is the big break from KLH's usual acoustic suspension approach. It gives the Model 33 a vented alignment, which boosts bass response. A schematic for the crossover network is available. Original units likely have carbon composition resistors, and those may need replacing during restoration.
Context
KLH was founded in 1957, and the Model 33 came out just a few years later. It was an early experiment with ported enclosures, at a time when the market was getting more interested in extended bass performance.
Market
Used units have been listed for around $24 to $25 in recent thrift or resale settings. Cabinet condition is often poor and may call for full refinishing. Replacing the aged crossover components, particularly the carbon comp resistors, is a common step in getting one working again.
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