View Full Version : AV Amp Stereo Improvement + sub connections
04-08-2003, 10:35 PM
Hi all, this is my first post! I have hung around for a while and am also quite a regular visitor to the avforums. Looks like a great place you have got here!! :)~:-)~:smile:
Anyway onto my problem - I am looking at adding a stereo amp to compliment my av amp (yamaha dsp ax620) and give me better music performance. I am also planning on upgrading my speakers + sub.
The amps I think would be suitable from reading these forums are the NAD C370, Arcam Diva A75+ and Audiolab 8000S (second hand off ebay) because these all have an av processor mode (am I correct here??) and can be plugged into the Av amp to amplify the main channels.
What I want to do is have all this lot connected up in such a way that the sub works for both music and movies without having to faff around with swapping speakers cables over etc.
My thinking is that I could plug the sub into both the line level from the av amp and high level from the stereo amp. Would this cause a problem when watching films since both amps would be active (stereo amp would be amplifying main channels) therefore the sub would be receiving the bass signal both through the low and high level input?? Do subs allow you to do this and which input takes priority?? :?~:-?~:???:
Would the Velodyne CHT10 be suitable for this sort of set up? Couldn't find any pics of it showing the rear of it it - does it have speaker binding posts?
Sorry for the string of questions but I'm a bit stumped!!! :?~:-?~:???: :?~:-?~:???:
Thanks in advance for your help... :D~:-D~:grin:
05-08-2003, 08:47 AM
First of all, welcome to the forum :clap:
I think I can answer the sub part for you.
The CHT10 has hi-level in, BUT it can not use both high and low level at the same time as far as I know. You will have to switch on the back of the sub between filter in and out (thats what it's named on the HGS18 at least, proably simular on the CHT10).
The only subs I'm aware of that can use both high and low level at once are REL.
05-08-2003, 01:29 PM
I have an Av receiver feeding a HiFi amp for L/R speakers. I do not have the sub wired in though for music.
THE CHT-10 (I know, I've got one :nod: ) does have high level inputs, so why not just use these. Connect HiFi sterio outs to sub and all other speakers from AV to sub. When playing music it will only get a signal from the HiFi amp (receiver switched off), when playing DVD's it will get a signal from all speakers (HiFi & AV amp switched on). I do not see a reason to connect both high & low level inputs. Also IIRC there CHT-10 does not have an input switch (but I might be wrong!), so you would not be able to switch between the 2.
Get the CHT-10, you will not be dissapointed! You will not find anything new that will better it for the price. It will do all you want, and more. I just hope you have understanding/deaf neighbours :lol: .
I believe all the amps you list do have the AV mode. I use Arcam Alpha 8R/8P amps for musice (the 8R also has the AV mode) and they have made a huge improvement in music. You just need to make sure that you AV receiver has pre-outs (sorry do not know your receiver) for connecting the amp.
05-08-2003, 05:59 PM
Thanks Mark / magking
Is there any disadvantage in using the high level inputs on the subwoofer. Would this degrade the signal to the main speakers at all? Also when watching films would the sub be getting the proper discrete .1 signal from the amplifier or would this all be mixed in with stuff from the main channels?
You say REL subs support both high and low level at the same time - would a second hand Q100e be a good bet then (how does this compare to the Velo CHT10)- do any other models in the velodyne or B&W (I'm thinking of buying speakers from the 600 series as part of my upgrade) range support this in the <£600 price range??
05-08-2003, 08:25 PM
I've just check the sub and it does NOT have a switch for the 2 inputs.
My AV receiver is set to all speakers small & crossover at 80Hz. This then sends the .1 & all bass below 80Hz to the sub or "all mixed in with stuff from the main channels" as you put it 8)~8-)~:cool: and useing the high level inputs would give the same.
The only real advantage that I see in useing the low level input is that you only need a single sub cable, therefore less speaker cable which save money :thumbup: .
I think Uncle Eric said something along the lines of " The CHT-10 is as good, if not better than, any sub around £500.
Oh and I also use the CHT-10 with the B&W 600 series speakers. Sounds GREAT! images/smiley_icons/headphones.gif
05-08-2003, 11:45 PM
So it sounds like what I need to do is plug my stereo amp (arcam a75+ or whatever) into my yamaha dsp ax620 main pre-outs. Plug the sub in using the high level inputs between the stereo amp and speakers and then set all the speakers to small and set the sub cross over to the same as the ax620 (just looked in the manual it says it is fixed at 90Hz). Also fiddling round with the menus on the dspax620 there is a setting to send bass to the mains. I would then plug in all my stereo sources to the stereo amp bypassing the av amp completely :D~:-D~:grin: and the DVD, vhs, freeview adaptor etc. into the av amp. Sounds like this setup should offer give me everything I need to do whilst minimising the faffing around with cables / settings 8)~8-)~:cool:
Mark, just another couple of quick questions, does the CHT 10 have binding posts or spring clips on the back of it + how do you rate you B&W 600 series speakers? I am considering the 602 S3 fronts, 600 S3 rears, LCR60 centre...
Cheers for your help guys 8)~8-)~:cool: 8)~8-)~:cool: - I'll have to get down the hifi store and get some demos on speakers / amps :thumbup:
06-08-2003, 08:46 AM
would a second hand Q100e be a good bet then (how does this compare to the Velo CHT10)
There probably wouldn't be much in it, although the CHT-10 goes a little deeper more cleanly and would be better for AV use than the Q100.
As you mention in your earlier post. There is nothing (currently) on sale in the UK at under £500 that can match the CHT-10's all-round performance level. This may be about to change in the very near future however.
06-08-2003, 08:57 AM
If you are going to connect the sub at high level only (i.e. just take a feed from the hifi amp) then you must tell you processor that you don't have a sub (yes, lie to it!) otherwise the LFE and the bass below 90Hz will be lost because you won't have anything connected to the .1 output on the back of the AV amp.
Having set sub to "no", you should set the mains to "large" (they will probably default to this anyway if sub = "no") but still set the centre and surrounds to "small".
The downside with this is that you will be asking your hifi amp and speakers to attempt to produce the full range + LFE signal - something they won't be capable of doing.
However, with the CHT10 you can get around this because it offers a high pass filter. What you do is run the speaker cables (all four of them) from the amp into the CHT10 - you then run a further set from the CHT10 on to the speakers. The CHT10 will deal with all frequencies below 80Hz and send the remainder on to your mains - it will, of course, do this for stereo and home cinema.
This useful feature will overcome the potential problems of connecting at high level only for home cinema.
06-08-2003, 09:50 AM
As Matt said you would need to set sub to 'no' as you would not be useing the dedicated sub output. But I would also suggest that you set ALL speakers to large as they will all be connected via the sub, therefore all base will be handled by the sub and not the speakers. Set the crrossover on the sub according to the speakers.
The CHT-10 has spring clips.
I like the B&W 600 series speakers, but as with all speakers you really need to demo them with the AV receiver & amp you will be useing. If you look at my signature you will see what I have got. Be aware though that the LCR60 is a large speaker and will be IMO too big to sit on top of all but the largest TV's. I would suggest putting it on a shelf or as I use for my surround rear, a microwave support.
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