User manual KLIPSCH ACT-3 ABM

[. . . ] In the case of Bass Management, this compatibility refers to a speaker's ability to handle a full range signal without damage. Dolby Digital contains an extra, . 1, or LFE channel, which is a limited bandwidth (20Hz-120Hz) channel. Dolby recommends that this channel only contain information below 80Hz whenever possible. A system can have a subwoofer that only reproduces the LFE channel, or the subwoofer can reproduce the LFE channel, as well as bass from other channels in the system, that may not be as adept at reproducing lower frequencies. [. . . ] There is essentially no down side to this attenuation other than the loss of overall gain. The LFE channel in Dolby Digital normally contains no extra information. Its presence is merely to augment the bass response for speakers which cannot necessarily handle a full range (20 Hz ­ 20 kHz) signal. 3 From the Dolby Laboratories website: http://www. dolby. com/digital/l. in. 9901. makingthemost. html "A final factor to consider is that the ". 1 track" is ignored by Dolby Digital's downmixing process, so it should include no vital information that would be missed in mono, stereo, or Pro Logic playback. " To achieve the best sound from your ACT-3, we offer the following suggestions: 1. Even if you have "full range" loudspeakers, most speakers will not produce high quality bass below 40 Hz. (certainly check the specifications on your loudspeaker, or contact the manufacturer) A subwoofer can greatly enhance your system, and allow you to get the full benefits from digital 5. 1 surround software. For DTS listening we strongly recommend a subwoofer, as the DTS decoder does not utilize the Bass Management system so the LFE channel in DTS cannot be rerouted to other channels If you do not have a subwoofer, setting the subwoofer to YES in the Bass Management system will eliminate the need for any attenuation. If you are having a gain problem due to the attenuation, this is the recommended setting. 2. To Exit the Bass Management Setup, simply press the B. MODES button again. There is no need to exit using the ENTER button to save your settings. Section 2: Crossover Settings While in the Bass Management setup mode, pressing the SEL/PLAY button in the center of the speaker selection grid will access the crossover setting menu. This crossover setting pertains to the high pass, AND the low pass filter, if in use. If you currently have any speaker set to utilize a High Pass Filter, The screen will read: All Crossovers 50 Hz Pressing the LVL UP button increases the crossover frequency. The following frequencies are available: 35 Hz, 40 Hz, 45 Hz, 50 Hz, 60 Hz, 65 Hz, 70 Hz, 80 Hz, 90 Hz, 100 Hz, 125 Hz Crossovers are 2nd Order filters, to allow integration with a larger array of loudspeakers. This frequency will pertain to any channel listed in the Bass Management With Crossover. Pressing the SEL/PLAY button again brings you to the Sub Out X-Over selection. You have a choice of YES, or NO as to whether or not you would like the subwoofer output to utilize a low pass filter. If you select YES, the low pass filter on the sub output will be the same frequency as the high pass filter. If you have not selected any of your speakers to utilize a high pass filter, you will not have the option to select a high pass crossover frequency. It is recommended that whenever possible, you utilize the crossover built into your subwoofer, as it will be better designed to suit that specific speaker design. If you are using the crossover built into the subwoofer, we recommend you set the Sub Out X-Over option to NO, so that the two crossovers do not conflict with each other. Section 3: Dolby Digital As Bass Management was essentially designed to accommodate the full frequency benefits that Dolby Digital 5. 1 now offers, DD is treated a bit differently in the Bass Management system. As noted above, when bass from high pass filtered channels is rerouted to other channels, these channels need to be attenuated to accommodate the added signal. We have limited this attenuation as much as possible while allowing the system to operate without overload during worst case scenarios. 4 If you have not done so, please read the suggestions listed in Section 1 regarding the subwoofer output, and Dolby Digital. [. . . ] There are certain DVD players on the market, that do not always output a digital signal whenever the player is on. In previous software, the ACT-3 required the presence of this digital signal at turn on, or when the DVD input is selected to recognize the digital output. We have adjusted the software to accommodate those players that do not always have a digital output present. Once a digital signal is recognized by the ACT-3, that input is now "memorized" as a digital input, and will default to digital whether or not a digital signal is present, indicated by the D at the bottom right hand corner of the display. [. . . ]