What are the crossover frequencies at 8ohm? and 4ohm?

Numerous people have asked this same question and no one knows the answer. This is a low-pass filter, that only allows bass frequencies to pass to a subwoofer speaker. Unfortunately, the manufacturer has provided any details on exactly what the crossover frequency is. The crossover frequency will be higher when connected to a 4-ohm speaker than it is when it's connected to an 8-ohm speaker. Unfortunately, neither of these frequencies specifications are included. It appears that there is also a high-pass selectable filter, that blocks frequencies below 0 Hz or below 8Hz. But there is no sound with a frequency of 0 Hz, so it's not really clear if it actually a high pass filter or not, and what speaker ohm loads these filter frequencies apply. Given the complete lack of low-pass crossover frequency information, I can't recommend anyone purchase this crossover.

How to install this? It has only one input and only one output. How does it divide the frequencies to the upper range?

Simple installation: connect the speaker to the output and the receiver/amp to the input, make sure the wires are connected right ( - to - and + to + )

What is the crossover frequency?

50-60hz is stated on the Weah 90a product page

can this be used to separate standard audio signal from stereo to filter out bass (22hz) for my amp driving a sub woofer?

No. This is not a crossover. It is not for two-way speakers. All this does is block frequencies abovr the cutoff frequency, which another person is 50 or 60 Hz per a spec found on Ailbaba. This is not a two-channel circuit. It takes one channel of audio and blocks bass above ~60 Hz, mid-range and trebel frequencies fro being deluvered to a subwoofer driver. Someone posted a 1-star review saying they installed it between the audio source and ampkifier and it didn't work. Of course it didn't, because his is a high-level filter. Not lune level. I might buy this and test it for my application, which is to drive an older relatively small passive subwoofer from an old home theater system. This is to supplement my ADS L200C two-way speakers for a small office system.

Is Electric	No
Power Source	Corded Electric
Number of Power Levels	1
Speaker Maximum Output Power	200 Watts
Subwoofer Connectivity Technology	Wired
Connectivity Protocol	wired
Connectivity Technology	Wired
Audio Driver Size	8 Inches
Number Of Circuits	1
Audio Driver Type	Dynamic Driver
Item Dimensions D x W x H	2.28"D x 3.15"W x 1.1"H
Number of Audio Channels	2.0
Compatible with Vehicle Type	Car
Compatible Devices	Smartphone, Tablet, Laptop, Desktop
Speaker Size	8 Inches
Woofer Diameter	8 Inches
Water Resistance Level	Not Water Resistant
MP3 player	No
Specific Uses For Product	car
Controller Type	Button
Is Waterproof	FALSE
Control Method	Touch
Speaker Type	Subwoofer
Additional Features	Bass Boost
Recommended Uses For Product	car
Subwoofer Diameter	8 Inches

200W Pure Bass Subwoofer Crossover Second-Order Crossover Frequency Distributor Divider 2 Way Speaker Audio Crossover Filter

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