Posted October 11, 200717 yr I have a Q 12 in a sealed box powered by a Cadence TXA-1000d. I'll listen to some bass heavy music for a bit, then when I get wherever I'm going I will check the sub on occasion and the cone is pretty dam hot! what would be causing this?
October 11, 200717 yr TXA-1000D? Is that the new style Cadence, black trim with chrome finish?If so I've seen one fail for no good reason at all...I'd look at your signal on an oscilloscope to see if there's anything wrong.
October 11, 200717 yr Author TXA-1000D? Is that the new style Cadence, black trim with chrome finish?If so I've seen one fail for no good reason at all...I'd look at your signal on an oscilloscope to see if there's anything wrong.Yup thats the amp. My first one was DOA and they sent me a new one. I have the gain set at about 80% and the bass boost at abt 50% on average. Would a clipped signal cause it to get hot? The reason I ask is that my system drains the hell out of my electrical system. So, when the voltage drops, it sends a "dirty" signal, correct? If thats true, would this "dirty" signal cause the sub to get hot?I can't afford one o those and I wouldnt know anyplace that would have one to use.Any other suggestions?
October 11, 200717 yr Author Thats probably what it is because, depending on the music, my voltage drops can drop considerably. I'm waiting for some extra cash to purchase a HO alt and do the big 3 which should definitely help my chituation
October 11, 200717 yr turn off the bass bost then look into readjusting the gain I cant imagine how god awful it sounds with all that clipping
October 11, 200717 yr Author Gain @ 80% & bass boost @ 50%... there is your problem.What would you suggest set them at?
October 11, 200717 yr Gain is to be matched to the input source voltage, some use a DMM as a quick way of setting gains, although not all that accurate.Bass boost should never be an option on an amplifier. OFF please.
October 11, 200717 yr Author Gain is to be matched to the input source voltage, some use a DMM as a quick way of setting gains, although not all that accurate.Bass boost should never be an option on an amplifier. OFF please.What about the use of the remote bass knob?
October 11, 200717 yr Gain is to be matched to the input source voltage, some use a DMM as a quick way of setting gains, although not all that accurate.Bass boost should never be an option on an amplifier. OFF please.What about the use of the remote bass knob?you should be fine useing it the knob shouldnt allow you to turn it up higher than what you set on the amp
October 11, 200717 yr Author Gain is to be matched to the input source voltage, some use a DMM as a quick way of setting gains, although not all that accurate.If I dont have a DMM how would i do that? Is there any other ways?
October 11, 200717 yr what you should do is get an amp with more power so you dont have to have the gain as high up
October 11, 200717 yr If you don't have a DMM, you don't have any business doing this yourself...Sorry, but there's some minimal level of test gear that you need just to have an idea what's going on with anything electrical
October 11, 200717 yr Author If you don't have a DMM, you don't have any business doing this yourself...Sorry, but there's some minimal level of test gear that you need just to have an idea what's going on with anything electrical What about an analog one, I think I have one of those layin round somewhere. If that would work would you be so kind as to describe that procedure so I can get this set up right?
October 11, 200717 yr Basic digital meters are $20, if that. A True RMS is better, but not completely essential, since the DMM method isn't exact anyways.
October 11, 200717 yr is the amp turning off at ANY point while playing the sub?? the amp jim speaks of is the one that my gf is running and it will click off after a while and start throwing DC at the sub. Luckily the Q is a beast and takes it like a champ, most other subs wouldn't.
October 11, 200717 yr I suffered an unfortunate loss with the bass boost last week, even at 25% it still killed my sub. Bass boost off, lol.
October 11, 200717 yr Author is the amp turning off at ANY point while playing the sub?? the amp jim speaks of is the one that my gf is running and it will click off after a while and start throwing DC at the sub. Luckily the Q is a beast and takes it like a champ, most other subs wouldn't.Not that Ive noticed. Does the sub start makin funky noises when that happens?
October 12, 200717 yr her amp didn't fully cut off, it'd just pop and then music would be at about 30% volume, couldn't tell from the cabin that the sub was being raped.
October 12, 200717 yr If your sub dustcap is too hot then reduce your volume. I had my q15 with playing some heavy bass songs for 10-15 mins and I could smell the coil and the cone is hot. Amp is tune with O scope. I think its the low voltage and high current thinggy. i do agree with the bass boost thing but gain up to 80% is too much.
October 12, 200717 yr i do agree with the bass boost thing but gain up to 80% is too much.As long as the output is unclipped, and there's no inducted noise present in the interconnects...who cares what the position of the gain knob is? Maximum unclipped power is going to be the same...
October 12, 200717 yr No such thing as low voltage/high current thingy...P=V^2/Z ALWAYS1.)also P = current^2 x resistancea.) say 1000 watts at 1 ohm 1000 watts = I^2 x 1 ohm Current = 31.6 ampsb.) now 1000 watts at 4 ohms 1000 = I^2 x 4 ohms 250 = I^2 Current = 15.8 amps2.) Now use I = V/Ra.)for 31.6 amps at 1 ohm 31.6 = V/1 ohm V = 31.6 Put those numbers into P = V^2/R and you get 31.6V x 31.6 amps = 964.72 = about 1000 wattsb.) for 15.8 amps 15.8 = V/4 ohms V = 63.2 Put those numbers into P = V^2/R and you get 63.2V x 15.8 amps = 998.56 = about 1000 wattsthis is with rounding some numbersso yeah the lower the load means higher the current and lower voltage for the same output powerCorrect me if I'm wrong about this Edited October 12, 200717 yr by aznboi3644
