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Ongoing LD/HD400 power output question
by ReplicantDave on 2010-06-08 02:59:41

This relates to a previous forum question ( http://line6.com/community/thread/32126) but I am starting a new thread as I'm not sure if "answered" questions will get looked at again......

I'm afraid I'm still finding anomalies in the FAQs for the LD400 Pro/ HD400

Your reply states that the internal speakers in the LD400 Pro is 4ohms, yet in this FAQ they are stated as 8ohms: http://line6.com/community/thread/19475class="jive-link-external-small" href="/thread/19475?tstart=60">

You say that an external 8ohm speaker can be connected in parallel with the internal 4ohm speakers - this would give a total impedance of 2.7ohms

You state that the power amp is the same in the LD400 and the HD400 but another FAQ says the min permissable load for the HD400 is 4ohms:

http://line6.com/community/thread/25918

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Can you please explain??

Thanks.



Re: Ongoing LD/HD400 power output question
by ricksox on 2010-06-10 12:48:31

Your reply states that the internal speakers in the LD400 Pro is 4ohms, yet in this FAQ they are stated as 8ohms: http://line6.com/community/thread/19475

Andy'sreply to you in that thread was:

3. Do the internal 2X10 speakers have 4 ohms or 8 ohms of impedance?
A: the internal speakers are 8 ohms

So I'm not sure where you got that notion.

You say that an external 8ohm speaker can be connected in parallel with the internal 4ohm speakers - this would give a total impedance of 2.7ohms

You state that the power amp is the same in the LD400 and the HD400 but another FAQ says the min permissable load for the HD400 is 4ohms:

http://line6.com/community/thread/25918

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Which FAQ in particular calls this out? Thanks!

Line6Miller



Re: Ongoing LD/HD400 power output question
by ReplicantDave on 2010-06-11 02:29:04

Thanks for your prompt reply - sorry if I did not make the question clear so I will try again:

Andy's reply to you in that thread was:

3. Do the internal 2X10 speakers have 4 ohms or 8 ohms of impedance?
A: the internal speakers are 8 ohms

So I'm not sure where you got that notion.

That was not my thread and Andy's reply there was not to me - The question was from "jwendt1".

However, it contradicts the answer Andy gave to my question in this thread: http://line6.com/community/thread/32126

Inhis reply dated 9th April 2010 at 10.01, he says:

  Q: Does the LD400 put out the full 400 watts to its 2 X 10" speakers?

  A: yes because we chose speakers that create a 4 ohm load internally.

If we can sort out this contradiction first, the second part of my question may or may not be relevant.

Thanks.



RE: Ongoing LD/HD400 power output question
by ricksox on 2010-06-15 11:53:34

Hello,

Teh (2) 10" speakers are connected in parallel to make a 4 ohm load. The power amp module is rated at 400W into 4 ohms with 1%THD.

Line6Miller



Re: RE: Ongoing LD/HD400 power output question
by ReplicantDave on 2010-06-16 01:17:39

OK - so on to the second question:

The LowDown Pilots Guide states on page 8:

"19. Extension Speaker Output (LD400Pro only) Only use an 8 Ohm Speaker cabinet when using the Extension Speaker Output".

This in parallel with the internal 4ohm load would give a total impedance of 2.7ohms.

However, the answer to this question states that the minimum permissible load is 4 Ohms: http://line6.com/community/thread/25918

style="font-family: Times New Roman; color: #800080; font-size: 12pt;">

"You will need to either have two 8 ohm cabinets or one cabinet with a 4 ohm load.  Now if you do not play so loud that you need the total power of the head, you can get an 8 ohm cabinet for now and if you start playing more/larger rooms that required more sound, get another 8 ohm cabinet which will unlock the rest of the power available to you.  I use 8 ohm cabinets, I have 2, 1-15" cabs and 1, 2x10" cab.  I can only use 2 of the 3 on the HD-400 at any given time as they are all 8 ohm and hooking up three would put too low a load on the head",

I hope you can now see where my confusion arises from?




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