m18use

Have a pair of tens in a box running off a big 1100w amp.
They dont sound any good unless its a mega bassy song,or its on so
loud it drives you mad,surely i should have good bass on at normal
volume.These subs are supposed to be excellent

UHF

is your gain set correctly? It might be wound around for a 4v output and you might only be giving them 2v on the preouts, i dunno? more info? or were you just telling us that they're crap? Also where do you have the crossover?

m18use

Gain is set correct as far as i know,the crossover is built
in the amp as it has 6 channels.The only thing i am wondering is the h/u only has 2 prouts,front and rear,and sub is connected to rear but even the bass control on the h/u doesnt really do a lot

UHF

Dont know what to suggest!

Sounds to me like there is a HPF on the preouts on HU side perhaps, is there an option for this? some head units have an option to make the rear preouts into sub outputs which give you different menus.

For example on my Pioneer DEH-P8000 I hold down function when its turned off and I get a setup menu, what you running?

From the fact that you cannot effect it suggests that its not levels as you quite rightly pointed out, so like I said, all thats left is that it might not have the frequency, ala HPF!

See if you can find a test mp3 with a frequency curve on it, I have one which starts at 20Hz and rolls up to 20Khz, very useful when testing such things.

[Edited by UHF - 5/24/2003 10:56:04 PM]

SlowBoy

iTrader: (1)

Polarity? Fader?

Sorry if I'm mentioning the obvious, but not much of a techie.

m18use

H/U is a kenwood x838 with loads of bits and bobs,will play in the morning as dont think neighbours will be happy now
Thanks for your help,will post what happens

UHF

I've just had a thought!!!

The Type R subs are Dual Voice coil, as in you have 2 contacts on the sub, one for each coil, these are rated at either 2Ohms or 4Ohms depending on which model you have.

1241D - 4 Ohms per coil
1221D - 2 Ohms per coil

If you've wired it wrong and you have the 4Ohm model you will have a 8Ohm load at which your amp is likely to be outputting a lot less power than it would at 4Ohms or 2Ohms.

How have you wired the subwoofer to the amp, precisely please, this could be a quick fix once you tell me

m18use

subs are wired + to + and - to - and the amp is wired + - to each sub if that makes sense.

UHF

so if we ignore the amp wiring you have two coils joined together to mirror the contacts on each, which are then presented as one to be connected to the amp? Sounds like Parallel mode to me which is fine.

Which model sub is it? if its a 1241 then you have a 2Ohm load if it is a 1221 then its a 1Ohm load. what amp is it and can it handle a 1Ohm load?

Also when you say you've wired to the amps + and - have you taken the + from left and the - from the right to get bridged mode or is it a dedicated subwoofer output with - and + next to each other?

m18use

its dedicated sub bit
subs are swr 1041d

UHF

you have 2 subs? both dual voice coil?

surely that means each sub has 2 4Ohm connectors?

which means 2Ohms per sub, in parrallel mode is 1Ohm, I'm surprised your amp will even fire up with that on it

m18use

Sorry mate lostme now but still sounding crap
Tryed all settings and no change

chiark

You're driving the amp at a 1 ohm mono load assuming you've got 4 4 ohm voicecoils all in parallel.

What amp is it, as many amps will not like this whatsoever.

UHF

thats kinda what i said

chiark

True - I'll rephrase:

What amp are you running?

m18use

Its a jbl 1100w ,6 channel which according to the shop should be
more than enough but im not convinced.

UHF

power is one thing but 1Ohm is quite another

chiark

Hate to tell you this mate, but that amp ain't ever going to put 1100W out of power in any meaningful way

I guess it's a JBL GT06000, rated at 4x50 + 2x75W, or 2x150 and 1x250W bridged into 4 ohm, or 2x125W into 2 ohms on the sub channel.

How have you got the subs wired up?

If you run each sub off the 2 high output channels, they'll get 125W each if you parallel up the voice coils, assuming that they're 4 ohm.

That should tickle them and make 'em move, but isn't a huge amount of power for a sub - each voicecoil is only receiving 60-odd W.

Bigger ballsier amp for subs would be my recommendation, or replace the subs with something like the genesis 6x9 subs on the shelf?

UHF

I think by what we worked out he has them wired in parallel which is giving a 1Ohm load with 4x4Ohm coils, like you I think the amp aint up to it.

Perhaps you should try one by itself, even then I dont think the amp is up for it.