kresner Posted April 12, 2019 Share Posted April 12, 2019 Hello Folks, I would like to connect my new Helix floor unit, via Aux In, to my V240HC ... then connect V240HC to an external set of Full Range-Flat Response monitors (via 1/4'" jacks) and need to disable ALL internal speakers in the 240HC when doing so ... I don't need, nor want, the tweeters active in the V240HC in this case ... the FRFR monitors handle high frequencies very nicely. It is my understanding that when external speakers are connected the V240HC tweeters remain active, regardless of Cab Simulation switch setting on back of the amp? Warranty issues aside ... would there be a problem (electrically with the V240HC) adding a physical switch that routes the internal tweeters to the 1/4 output jacks when I have FRFR speakers attached to the same jacks? It would seem that as long as impedance of the FRFR speakers are compatible, the V240HC should be happy ... or not?? I would have to figure whether to connect the tweeters in parallel or series to ensure the resultant impedance is acceptable. Seems simple enough ... hence probably not!! Thanks! Quote Link to comment Share on other sites More sharing options...
Kilrahi Posted April 13, 2019 Share Posted April 13, 2019 21 hours ago, kresner said: Hello Folks, I would like to connect my new Helix floor unit, via Aux In, to my V240HC ... then connect V240HC to an external set of Full Range-Flat Response monitors (via 1/4'" jacks) and need to disable ALL internal speakers in the 240HC when doing so ... I don't need, nor want, the tweeters active in the V240HC in this case ... the FRFR monitors handle high frequencies very nicely. It is my understanding that when external speakers are connected the V240HC tweeters remain active, regardless of Cab Simulation switch setting on back of the amp? Warranty issues aside ... would there be a problem (electrically with the V240HC) adding a physical switch that routes the internal tweeters to the 1/4 output jacks when I have FRFR speakers attached to the same jacks? It would seem that as long as impedance of the FRFR speakers are compatible, the V240HC should be happy ... or not?? I would have to figure whether to connect the tweeters in parallel or series to ensure the resultant impedance is acceptable. Seems simple enough ... hence probably not!! Thanks! Why in the name of Bob would you even want to do this? What possible advantage is there in doing the above setup vs. going from Helix directly to your monitors? Quote Link to comment Share on other sites More sharing options...
kresner Posted April 13, 2019 Author Share Posted April 13, 2019 Bob says ... "cause Yamaha CBR12's are passive speakers ... and I don't own a powered PA system. So when jamming at home and I need some dB's (or gig with no PA system) the 240HC works fine paired to the CBR12's. Hence Bob's request for info on the modification. If connecting to a PA/front of house system, then of course I would run Helix directly to them" Cheers Mate 1 Quote Link to comment Share on other sites More sharing options...
bobcoss Posted April 30, 2019 Share Posted April 30, 2019 Hi, Another Bob weighing in. I've plugged my helix floor into the aux in on my 240HC before too. It sounds pretty good. I usually use my headrush 12 FRFR speaker though. I would not want to disable the built in 240hc tweeter speakers because they are essentially bi-amped. You would not be able to keep a load on the amp, and could damage it. On the other side of the coin, I don't think you are getting those higher frequencies to the CBR12's. The head is designed to have those tweeters provide the high frequencies when plugged into a guitar cabinet, and the normal guitar amp/speaker frequencies go to the cabinet. Of course there is no way to balance the cabinet with the tweeters because what they really want you to do is buy their half stack to put it on. That might be why I use my FRFR more than mess with the 240hc and the helix. I do find myself pluggin into the 240hc on a regular basis just to mess with the amps and effects. I think it sounds great. I just wish it had effects send and return so I could marry the helix with it in other ways. Bob Quote Link to comment Share on other sites More sharing options...
kresner Posted May 8, 2019 Author Share Posted May 8, 2019 Hi Bob, Thanks for the response and some food for thought. I wasn't proposing "disabling" the tweeters, but physically switching them to the 1/4 " outs ONLY when FRFR speakers are connected ... to ensure amp circuit for tweeters had a load at all times to avoid damage (if they are indeed on their own amp circuit, which is likely now that you mention it). I assumed high frequencies were also being sent out the 1/4" jacks, but I think you are correct in that Line 6 assumes you are connecting a SPEAKER cab with poor high frequency response, hence the amp head tweeters. Maybe I'll get in touch with Line 6 tech support to see if I can get some specifics about what frequencies are sent out to external speakers ... but I think you are correct. Provided the tweeter circuits always have the minimum required load on them, either amp head speakers or external, I can't see why the 240HC would care either way. So I'm inclined to do the modification. As long as one ensures tweeters always have a load connected to them BEFORE powering on the amp, all should be good! Some sort of simple default "safe mode" detection/switching relay circuit for the tweets would take the "oh sh#% I forgot to ..." factor out of the equation :-) A good rainy day project. Ken Quote Link to comment Share on other sites More sharing options...
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