Lyngdorf Audio RoomPerfect RP-1 - Manual (Page 28)

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Crossover Frequency
Crossover Frequency is only available when Routing has been setup.
The Crossover Frequency can be selected anywhere between 40 – 9999Hz.
It is very diffi cult to give exact guidelines to setting a suitable crossover frequency, fi lter type and order
since this depends on the exact drivers and confi gurations. Therefore, the following recommendations
should be seen as a good starting point only.
In general, the recommended crossover frequency between (sub)woofers and main speakers is be-
tween 200 - 400 Hz.
By using a high crossover frequency, the rear wall quarter wavelength refl ection is removed from the
main speakers.
If a Lyngdorf Audio boundary woofer is used in a 2+2 set-up, a crossover frequency of 400 is recom-
mended due to the high bandwidth of the boundary woofer.
For conventional active subwoofers with built in low pass fi lter the recommended crossover frequency
is the upper low-pass frequency of the subwoofer.
If at all possible, the low pass fi lter in the subwoofer should be bypassed. Due to the quarter wave
refl ection from the rear wall corresponding to the depth of the subwoofer cabinet we recommend an
crossover point at approximately 200 Hz. You might experiment with turning the subwoofer so the driver
faces the wall in a distance of 5 to 10 cm. This will increase the bandwidth of the subwoofer.
However, due to the limited bandwidth (frequency response) of most conventional subwoofers you
might fi nd it necessary to choose a lower crossover frequency.
When ‘building’ active speaker systems it is recommended to use the original crossover point(s) used
by the manufacturer. Due to the short wavelengths of the mid/high frequencies it is essential that both
crossover frequency, fi lter type and order as well as delay is set correctly. Therefore, creating fi lters for
active speakers is an iterative process that requires several critical listening sessions in order to achieve
seamless integration of the different speaker drivers.
Filter Type
Filter Type
Filter Type is only available when Routing has been setup.
It is possible to choose from two different Filter Types in this menu.
LiRi: (Linkwitz Riley) 2, 4 or 8 order.
Butw: (Butterworth) 1, 2 or 4 order.
In a 2+2 set-up (main speakers + Lyngdorf Audio boundary woofers) we recommend using a fourth order
Linkwitz Riley fi lter.
In set-ups using conventional active subwoofers – again due to limited bandwidth – we recommend us-
ing a second order butterworth fi lter.
In active speaker systems it is recommended starting with a fourth order Linkwitz Riley fi lter.
Crossover freq.