Product Description
Tired of turning your system up to hear the dialog and down because the effects are too loud? Then put your money in a high performance center channel speaker like the LSiM704c. Big enough to stand up to the power of the floor standing LSiM705 or the LSiM703 bookshelf loudspeaker, you can use this center channel speaker to perfectly match the size and performance you're looking for. The LSiM704c has all the earmarks of a great center: crystalline detail, fast natural midrange and impactful bass. With its dynamic sonic engine, twin 5 1/4 inch woofers and a dual Power Port venting system, the LSiM704c will reveal the whisper, the shout and the thump thump of the helicopter flying over.
From the Manufacturer
Big enough to stand up to the power of the floorstanding LSiM705 or the LSiM703 bookshelf loudspeaker, you can use this center channel speaker to perfectly match the size and performance you're looking for. The LSiM704c has all the earmarks of a great center: crystalline detail, fast natural midrange and impactful bass.
key features
- Polk's exclusive dynamic sonic engine design optimizes the midrange driver and the ring radiator tweeter in separate interior chambers for improved transient response, superior imaging and greater horizontal off-axis response.
- Our innovative overhung voice coil design augments the excursion length for subwoofers, increasing their power-handling capabilities and enhancing bass response.
- Extended linear motion voice coil design allows lots of movement in a limited space, reducing impedance and extending mid- and high-frequency response.
- Lightweight, rigid cast aluminum baskets are designed for precision motor alignment with unobstructed linear movement and ample venting.
- Polk's proprietary, patented Dynamic Balance® technology designs out distortion-causing driver and system resonances, so you only hear the good sounds.
- Super cell aerated polypropylene cone is the ideal balance of lightweight stiffness and superior damping properties.
take a look inside this product
technology
Dynamic Sonic Engine
This is a molded enclosure within the cabinet that houses the super-accurate ring radiator tweeter and the extended motion midrange driver in their own separate, tuned compartments. This aligned, optimized array contributes to wide, uniform dispersion in the critical 200Hz - 2kHz range. The dynamic sonic engine, in turn, lives in a separate, rigidly braced enclosure-within-the-enclosure. This separation and specialized tuning measurably reduces performance-robbing back wave reflections. The result is astonishing detail and realistic imaging, with improved transient response, exact timbre-matching, and greater horizontal off-axis response.
Enhanced Ring Radiator Tweeter
Our engineers took the ring radiator tweeter, usually seen in only the most exotic speakers, and found way to improve it. They reshaped the tweeter's bullet-shaped phase plug to eliminate horn-loading and improve dispersion. Redesigning the tweeter faceplate and the diaphragm added efficiency. Finally, they gave their new ring radiator tweeter its own tuned enclosure within the dynamic sonic engine. This enhanced ring radiator boasts higher power handling, extended dynamic range, better dispersion and extended top-end response
Klippel Optimized Dynamic Balance® Transducers
All transducers are developed using our proprietary Dynamic Balance technology to reduce or eliminate unwanted material and interface resonance that color the sound. Klippel measurement systems are employed during development to ensure the speaker will deliver life-like highly detailed playback at both low and high volumes levels.
Super Cell Aerated Polypropylene Cone Material
The perfect cone material is lightweight (for faster, more efficient action) and stiff (for less distortion-causing flex), with enough internal damping to suppress and offset any limitations of its lightweight stiffness and our super cell aerated polypropylene cone material is about as perfect as it gets. It's the ideal balance of lightweight stiffness with high damping, along with good resistance to moisture, UV and temperature extremes. Our drivers are fast, linear and nearly resonance free.
why you should consider this product
Slightly smaller than the flagship LSiM 706c, this high performance center channel speaker anchors the action in home theater systems based around the smaller LSiM floorstanding model (LSiM 705) or LSiM bookshelf model (LSiM 703). The LSiM 704c makes a massive impact and reveals sparkling pinpoint details, with a wide soundstage and deep bass reproduction. It puts you in the center of the action!
technical specifications
| Driver Complements | |
|---|---|
| Tweeter | 1" Diameter (2.54cm) Dynamic Balance enhanced ring radiator tweeter |
| Midrange | 3 1/4" Diameter (8.26cm) Dynamic Balance driver with super cell aerated polypropylene cone |
| Mid/Woofer | 5 1/4" Diameter (13.34cm) Dynamic Balance driver with super cell aerated polypropylene cone |
| Electrical | |
| Total Frequency Response | 40Hz - 40kHz |
| Upper -3dB Limit | 30kHz |
| Lower -3dB Limit | 70Hz |
| Nominal Impedance | 8 ohms |
| Efficiency | 88 dB |
| Recommended Amplifier Power | 20 - 200 Watts per channel |
| Inputs | Dual gold-plated binding posts |
| Crossover | Orth crossover design |
| Tweeter/midrange crossover frequency | 2.5kHz |
| Midrange/midbass crossover frequency | 280Hz |
| Dimensions | |
| Cabinet height | 7 3/4" (19.68cm) |
| Cabinet width | 21 3/16" (53.82cm) |
| Cabinet depth | 9 3/8" (23.81cm) |
| Mid-high array enclosure | Sealed |
| Midwoofer enclosure | Dual PowerPort® bass venting |
| Product weight | 29.1 pounds(each) |
| Shipping | |
| Unit of Measure | Each |
| Total Shipping Weight | 29.1 pounds |
| Included Accessories | Binding posts jumpers; Owners manual; Registration card |
| Warranty* | |
| Speaker Warranty | 5 years parts and labor (original purchaser) |
*To ensure a valid warranty, Polk loudspeakers must be purchased through an Authorized Polk home or car loudspeaker Dealer (such as .com). (If you’re not sure a dealer is "authorized," call Polk at 1-800-377-7655, and ask us.) The warranty is not transferrable, that means it applies only to the original purchaser. If you purchase your speakers from a private individual, that product is considered "used" and has NO factory warranty, no matter what the seller implies. The warranty is VOID if the serial number of the speaker has been removed or defaced. If you have any questions about your warranty coverage, or you think you need service, call Polk Customer Service at 1-800-377-7655. We’re here to help you get the most from your new speakers!
in the box
- LSiM 704c center channel loudspeaker
- Owner’s manual
- Online registration card
use with these products
LSiM 705 floorstanding loudspeakers
LSiM 703 bookshelf loudspeakers
downloads
