American Recorder HD fidelity speaker system- Comes with one HDF-C5 center channel speaker, one HDF-S10 subwoofer, 4 HDF-B5 bookshelf speakers, a C700 laser alignment tool and a sound pressure level meter - Precision laser alignment- Once precise speaker placement is achieved, the sound pressure level meter is used to obtain each channels proper sound level- Installation guide included- Dynamic carbon cone drivers- High output soft dome tweeters- Low resonance medium density fiberboard cabinets- System black in colorHDF-B5 Bookshelf speakers- 2 way- 8 ohm impedance- 91 db sensitivity- 50-22,000 Hz frequency response- 120 Watts power handling- 1 x 5.25 inch Carbon cone woofer- 1 inch soft dome tweeterHDF-C5 Center channel speaker- 2 way- 8 ohm impedance- 91 db sensitivity- 70-22,000 Hz frequency response- 100 Watts power handling- 2 x 5.25 inch Carbon cone woofer- 1 inch soft dome tweeter HDF-S10 Subwoofer- Vented, down firing enclosure- 4 ohm impedance- 92 db sensitivity- 35-200 Hz frequency response- 150 Watts amplification at less than 1% THD- Selectable 80 Hz/24 db octive (fixed) or by-pass (adjust) crossover - 1 x 10 inch carbon cone wooferC700 Laser alignment tool~~- Class III laser- 630-670 NM wavelength- <5mW output- .25 inch accuracy at 100 feet- Billet aluminum - Brass switchSound pressure level meter- IEC651, type 2, ANSI- 31.5 Hz - 8KHz frequency range- 35-130db Measuring level- A/C Frequency weighting- .5 inch electrical condenser microphone- 9 Volt DC power requirementHDFSYS1