Use low-level or .1 sub input from Ultra?

[khuntim]

Going to try this small REL sub, it has 2 different coaxial inputs, low-level and .1

everything I read says .1 is not supported with PCM 2.0, use the low-level input?

I am assuming the Ultra takes the 5.1 DD/AC3 and converts to 2.0 PCM, so curious what the advantage is opposed to an ARC input that supports only PCM?

Interested in the Amp Ultra if it ever shows up here, I found some speakers I like. just want to test this sub. well, not really a sub at 6.5" but the room is small.

 

[harkpabst]

Going to try this small REL sub, it has 2 different coaxial inputs, low-level and .1

These are analogue RCA inputs btw., not digital coaxial inputs.

everything I read says .1 is not supported with PCM 2.0, use the low-level input?

I am assuming the Ultra takes the 5.1 DD/AC3 and converts to 2.0 PCM, so curious what the advantage is opposed to an ARC input that supports only PCM?

Don't trust what REL are telling you. The subwoofer output on the WiiM Amp Ultra (and the other WiiM Amps and the WiiM Ultra) works completely independent of the input signal. It doesn't matter at all if you feed it 2 channel PCM or 5.1 DD.

In each case the WiiM Amp Ultra will split the signal between main speakers and subwoofer, anywhere between 30 Hz and 250 Hz. In many cases 80 Hz is a reasonable value for acoustical reasons. Higher or lower crossover frequencies can make sense depending on the speakers used, room influence and the position of the sub. This all has nothing to do with THX standards or the LFE.

Routing the signal between mains and sub is something completely different from downmixing multi-channel content to stereo. As of now, the WiiM devices do not downmix the LFE in 5.1 DD programme material into the stereo signal. It doesn't matter if a sub is connected or not.

You do want to use the LFE input though when connecting the WiiM Amp Ultra. The true meaning of this subwoofer input is that the sub will not add its own low pass filter. It will totally leave this duty to the upfront device. In REL's limited imagination this device must be an AVR because two channel audio equipment does not provide subwoofer management. Well, they are wrong. The WiiM devices do.

 

[harkpabst]

PS:
You've been mentioning the Amp Ultra but the subject line is about the Ultra (and this is an Ultra sub-forum).

Just to be perfectly clear: All of the above applies to the Ultra and the Amp Ultra. No difference at all.

 

[khuntim]

PS:
You've been mentioning the Amp Ultra but the subject line is about the Ultra (and this is an Ultra sub-forum).

Just to be perfectly clear: All of the above applies to the Ultra and the Amp Ultra. No difference at all.

I am using the Ultra, Hope to see an Amp Ultra here soon, interested in it.

using the .1 input and working. if a change the subwoofer crossover, does that change what happens with Room Correction? I set it to 100hz at first since small powered speakers and small woofer.

used iPad mini, I also have Android phone not really sure where the mics are on the iPad, just held it at ear level.

Will a dedicated mic make a lot of difference?

Thanks for the help

 

[harkpabst]

using the .1 input and working. if a change the subwoofer crossover, does that change what happens with Room Correction? I set it to 100hz at first since small powered speakers and small woofer.

100 Hz sounds very reasonable with smaller speakers.

You should re-run RoomFit whenever you change the positioning of the speakers or sub or the crossover frequency. Mains and sub will excite the room in different ways, so changing the crossover frequency will change the distribution of sound.

used iPad mini, I also have Android phone not really sure where the mics are on the iPad, just held it at ear level.

Will a dedicated mic make a lot of difference?

Potentially the iPad mic should be better suited. An external microphone with a dedicated calibration file is always the better choice.