Celestion SL-700

Not much is documented about the Celestion SL-700 beyond period press coverage. The record shows a compact two-way loudspeaker from Celestion's SL series, closely related to the SL600. Reviewers in the late 1980s took it seriously.

HiFI-Stereo (September 1987, p.54) examined the SL700 and described a crossover at 3,000 Hz using a second-order low-pass section and a third-order high-pass section. The same review noted the cabinet was made of Aerolam, a sandwich of aluminum sheets bonded to a honeycomb core, and that the speaker could be run from a single amplifier or bi-amplified, with separate amplifiers for the woofer and tweeter sections. The magazine's measurements (p.56) showed the impedance reaching a minimum of about 6 ohms at 150 Hz and rising to 43 ohms at 68 Hz. In A/B listening comparisons against other speakers — some with better measured frequency-response characteristics — the "diminutive Celestions" held their own.

The SL700 also turned up in US dealer advertising into the early 1990s. Audio (May 1990, p.174) listed it among contemporary "hot components" alongside Counterpoint and MIT. Past those fragments, the record is thin. Celestion's own documentation for the SL700 is scarce, and no original pricing, production years, or full specification sheet have surfaced in the archive.

Known details from period reviews:

- Two-way speaker with crossover at 3,000 Hz (second-order low-pass, third-order high-pass)

- Aerolam cabinet - aluminum sheets bonded to honeycomb

- Usable with a single amplifier or bi-amplified

- Impedance: ~6 Ω minimum at 150 Hz; 43 Ω at 68 Hz