There's no crossover on the LFE input, the crossover is only for the speaker level input.
There's no crossover on the LFE input, the crossover is only for the speaker level input.
yes? But nevertheless, the amp will only play a certain bandwidth, it's not a full range amp.Originally Posted by rdgrimes
For the record, I'm the sucker who bought this. $70 all-in and it includes all original packing, grill, docking hardware, LED panel and PT800 filter (whatever that does).
Now I just need a LE14H-3 and another amp.
The LFE frequency range is controlled by the source/AVR which is a brick wall @120 htz ~ 20 htz. And at the speaker level input its XO @130 htz. So what is your point? No one said it was a full range amp.
Living in the Land of the Sun
The speaker level input crossover is EITHER 130Hz or 80Hz depending on the switch. I think that's where the confusion lies.
I understand that. I was mentioning that the max frequency output by the sub is 130 htz at its upper XO point.
But as for the LFE a brick wall @ 120.
Living in the Land of the Sun
Actually there's some evidence that the 120Hz brick wall doesn't exist unless the processor has a filter on the LFE channel (many don't). There's lots of source material with sounds above 120Hz, and sound engineers routinely ignore specs. I've seen examples of movie tracks with LFE channel content up to 200Hz. And of course many systems use bass steering into the LFE channel that can contain most anything if set up with a higher XO point. Not to worry though, the LE14H is fully capable well past that point.
Hell I don't know! I think I'm still a little confused by the question to be frank! But as for the LFE, this is what the JBL manual says:
¤LFE/Subwoofer Input – This
jack accepts either an LFE or
line-level output from the
receiver or processor.
So it could be either a full range signal, or a filtered one. In another place it says:
In the “Separated” position,
the PS1400 provides an
electronic 300Hz rolloff for the
subwoofer, which should be
augmented by the low-pass
crossover in the external
audio/video receiver or
processor.
But back to posters original question it says:
ªLF Crossover Switch – This
switch is used to engage the
PS1400’s internal crossover
when it is stacked with the
PT800 tower module, and when
no external crossover is being
used. In the “Normal” position,
the internal crossover is
engaged, and provides an
electronic 130Hz crossover for
the subwoofer which precisely
matches the passive 130Hz
crossover point of the output
terminal to the PT800. The
crossover is precision designed
to create a smooth,
integrated floorstanding
speaker system when the
PS1400 and PT800 are stacked.
So, it sounds to me as if the crossover in question (which I have seen myself) is designed to create a more perfect transition to the PT800, in the docked position. I was just pointing out that whether or not another crossover is used/exists, the amp is somehow limited in its frequency output by design and would only present a limited bandwidth, crossover or not. I'm not sure if this answers any questions. I'm not even sure if I understand the posters premise and apologize if I am not being helpful!
The original LE14A was run up to 2000 hz in the L55. Even the VLF sub1500 is good to 500 hz.
One question I've had about the 130 hz XO in the PS, how it even works; being the PT800 is -6db @80, and the f3 @100. So @130 its down about only 1.5 db. And then still can provide a smooth XO @ either 130 or 80.
Living in the Land of the Sun
That is basically standard. If any given sub only has a sub line in connection, no LFE, then it says to turn the sub's XO all the way up, to get it out of the way of the AVR's 80 hz. Most sub XOs top out at 150. Any LFE input has NO XO in the path.In the “Separated” position,
the PS1400 provides an
electronic 300Hz rolloff for the
subwoofer, which should be
augmented by the low-pass
crossover in the external
audio/video receiver or
processor.
Living in the Land of the Sun
So, in the "normal" position, there are 2 crossovers, 1 electronic, 1 passive, both set to 130hz. I take it that the electronic crossover is used when the LFE input is used (in the normal position), the passive one when the Speaker input are used? In the "separated" position there is an electronic 300hz rolloff to be augmented by a processor, no XO in seperated, correct?
The LFE input is totally separate from the XO. When docked the sub is set to 130. The PT800 has a passive XO at 130.
The LFE is supplying the .1 channel
When separated, the sub has the natural roll off at 300 with no XO, as the AVR is supplying the 80 hz xo.
Living in the Land of the Sun
The manual doesn't support your statement:
LF Crossover Switch – This
switch is used to engage the
PS1400’s internal crossover
when it is stacked with the
PT800 tower module, and when
no external crossover is being
used. In the “Normal” position,
the internal crossover is
engaged, and provides an
electronic 130Hz crossover for
the subwoofer which precisely
matches the passive 130Hz
crossover point of the output
terminal to the PT800
It states clearly that the passive crossover is output to the PT800, not that the PT800 has the crossover. The "normal" engages the internal electronic crossover if an external XO (processor) is not used. The passive one goes without saying, a speaker level input. The LFE input is only LFE when in Seperated mode, otherwise, it's noraml... 130hz.
An electronic XO suggests a line level input, yes?
Additionally:
In the “Separated” position,
the PS1400 provides an
electronic 300Hz rolloff for the
subwoofer, which should be
augmented by the low-pass
crossover in the external
audio/video receiver or
processor. In this mode, the
PT800, whether or not it is
stacked with the PS1400,
should be given only a highpassed
amplifier signal. That
signal should be crossed over
at 80Hz.
This proves that the PT800 does not have a 130hz crossover..
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