Amperage advice

walkie · 24-05-2005, 21:26

Ladies and Gents,

After a little amperage advice/help/recommendations...

Basically, the system thus far:

2x Alpine Type R 10" DVC 300w rms each

1pair Alpine Alpine SPR17LS components 50w rms each...

Thats it, nothing to major, but I want just 1 amp to give adequate power to all of the above...

In a nut shell would I need a 4 channel amp cable of 700w route means square (sorry, wanted to feel clever

) bridge two channles for 600w rms and the other two for the components at 50w rms each??

Or am I barking up the wrong tree entirley?

Any help would be great, cheers

Grant · 24-05-2005, 22:01

I'd recommend getting two amps, a digital amp for the subs and another (analogue) for the fronts.
This way is more flexible as you can choose amps that suit your power requirements and wallet.

Do you know what impendence your subs are, e.g single voice coil 4 ohm.?

Have a look on www.talkaudio.co.uk, their very helpful!

**robmawer** · 25-05-2005, 12:58

Quote:

Originally Posted by walkie

In a nut shell would I need a 4 channel amp cable of 700w route means square (sorry, wanted to feel clever

) bridge two channles for 600w rms and the other two for the components at 50w rms each??

Use your headunit to power the components.

Get a two-channel amp (2 x 300W RMS or greater), run it in stereo and have a left and right sub...

Rob.

eatsoot04 · 25-05-2005, 13:51

good choice of subs mate! LOUD & clear

bengie · 25-05-2005, 18:28

get seperate mate, do you have the subs yet? really you want 4ohm subs, then you could bridge em down to 2ohm each and then bridge the pair down to 1ohm to get the most of them but this obviously requires a 1ohm stable amp, then get a 4 channel amp to run the components at the front. a bit priceir but by far the best way of doing it

CupraR-Rog · 25-05-2005, 18:53

Not many, if ANY amps will be stable when bridged at 1 Ohm - this will really restrict your options!! However, if your subs can be run at a total load of 2 Ohms, then this option is still open for you.

Best bet would be to get a single channel amp for your subs, and a 2 channel amp for your components. Don't be afraid of running a higher wattage amp than your subs / speakers are rated at - just have the gains turned down a little!! (I currently run 600W into a 500W sub (soon to be dual subs tho!), and 75W into 60W (I think!) components). As you're not going to be running any bass to your components (make sure you get an amp that has high pass filters!), you can afford to crank the power up that bit higher! Just listen out for distortion when you're setting your gains!!

Alternatively, if you really want to splash out...

Get a 4 channel amp for the components, and mount the crossover before the inputs... that way your can run your mids and tweeters from seperate channels, giving you a better sound, and more scope to tweak the settings!

However, if that's then the route you want to go, you could then look at 5 channel amps. I run a Directed 1100d5 which serves me well.

Good luck, and remember, don't rush in to anything!

bengie · 25-05-2005, 19:02

the thing to remember when setting up the subs wiring wise is the ohm's make a massive difference, rog you say your putting 600W into your sub, is your amp capable of that at 1ohm,2ohm or 4ohm??

as you double the ohm you halve the wattage output so an amp that puts out 600W at 1ohm is only capable of running 300W at 2ohm and 150W at 4ohm

directed do some nice 1ohm stable amps that are very good sound wise and also not too pricey

CupraR-Rog · 25-05-2005, 19:11

600W at 1 Ohm, into a dual-2 Ohm sub wired in parallel, i.e. 1 Ohm.

On the landing (well away from my computer after what just happened to my TV!) I have 2 x Dual-4 Ohm subs, which will be all wired up in parallel to still give a 1 Ohm load to the amp, but with 2 subs instead of 1.

bengie · 25-05-2005, 19:14

good going rog, thats the setup i'll end up with soon

walkie · 25-05-2005, 22:17

Crikey, lots to think about their, cheers for the advice Mr Cupra R

Bengie, not got the subs yet, here's the deal i am going for:

2x http://www.cel-direct.com/shop1.asp?s_page=subsize.asp

They are DVC and cabable, I believe of 2ohms, judging from the part no, and Alpines website: http://www.alpine-europe.com/content...Ohm%2B4Ohm.htm

So could they be bridged down to 1ohm?

Sorry am a little lost here

Cheers for the help

CupraR-Rog · 25-05-2005, 22:37

They could be bridged down to 1 ohm EACH, which means you have 3 options of what to show your amp...

0.5 Ohms Parallel (good luck finding an amp stable at that!)
2 Ohms... Series coils, parallel subs... Hmmm... not good if you have an amp that's 1 Ohm stable... but good if you haven't!!

8 Ohms all series... Don't go there!!

If you get 2 of the dual 4 ohm versions, You can parallel up the coils on each sub to give a 2 ohm load. Parallel the subs again when you connect them to the amp and the amp will see 1 ohm load.

BUT... NOW is the time to choose your amp!! If you get an amp that's only 2 ohm stable, then get 2 of the dual-2 Ohm versions. If the amp is 1 Ohm stable, then get a pair of the dual- 4 Ohms.

Hope that makes sense!!

**tfboy** · 25-05-2005, 22:39

James, you daft sparky

If you get the 2ohm DVC, then you can wire them in parallel for 1ohm (1/R = 1/r1 + r/r2 = 1/2 + 1/2 = 1

) for series for 4ohm. You'd only really want the 4ohm DVC to wire in series if you amp can only do 2ohm stable

May I give a plug to some friends of mine who do some rather nice Voodoo sub amps? I've heard them running 4 sony xplods (which aren't renowned (sp?) for their thumpiness) and I can't sit in the car they're that evil

edit re-reading MR Cupra's post, I forgot you were talking about a pair of DVC subs. If you want two, then you have to do the numbers game and work out your amp requirements.

IMHO, unless you want to go silly loud, one sub is more than enough to fill the car and still have some decent SQ. As I said, vrs_si who's the voodoo man has 4 subs but I think he's bordering on insanity

walkie · 25-05-2005, 22:42

Quote:

Originally Posted by tfboy

James, you daft sparky

If you get the 2ohm DVC, then you can wire them in parallel for 1ohm (1/R = 1/r1 + r/r2 = 1/2 + 1/2 = 1

) for series for 4ohm. You'd only really want the 4ohm DVC to wire in series if you amp can only do 2ohm stable

May I give a plug to some friends of mine who do some rather nice Voodoo sub amps? I've heard them running 4 sony xplods (which aren't renowned (sp?) for their thumpiness) and I can't sit in the car they're that evil

lol call it the beer

Plug away

Need to find me the 4 ohm dvc versions

**tfboy** · 25-05-2005, 22:50

800W or 1kW Class D monoblock amp 1ohm stable. Should do nicely

I guess the bad point is it's the wrong side of £300 new

Any idea how much you want to spend on the amp(s) ?

bengie · 25-05-2005, 22:55

as said i have twin 10's and i don't think i'd go for anything else in the future as long as they fit

walkie · 25-05-2005, 23:01

Well tbh this was planned to be a budget install

Sound deadening £50.00 (flashing tape or something lol)

Wiring £50-75ish

Components £110

Sub/subs £300

Amp/amps £350

I think I may have to be looking at 2nd hand for the amp's...

The brains is an Alpine CDA-9831R

bengie · 26-05-2005, 00:03

james, i am expecting to get my alpines pretty soon if you want to hear before you buy

walkie · 26-05-2005, 07:33

Quote:

Originally Posted by bengie

james, i am expecting to get my alpines pretty soon if you want to hear before you buy

Yes please

Where are you getting them from, and for how much?

**robmawer** · 26-05-2005, 10:06

Quote:

Originally Posted by walkie

The brains is an Alpine CDA-9831R

...which will be more than capable of driving the front components thus allowing you to spend the entire amp budget on powering the sub...

Rob.

bengie · 26-05-2005, 15:26

alpine's are nice and powerfull

bengie · 26-05-2005, 23:27

got my new subs today and got them in already

will get some pics tomorrow in the sunlight, must say they look quite swanky and nice.

they definitly sound nice and powerfull but not sure about my amp now, think it may need some additional cooling as it occasionaly cuts out for a second then goes on again like normal. my amps are under a false floor.

24-05-2005, 21:26	#1
walkie ............... Join Date: Aug 2004 Location: Monday: MK Tuesday: MK Wednesday: MK Thursday: MK Friday: MK/Home Saturday: Home Sunday: In bed ;o) Posts: 6,606 Members Car: BMW 120D M-Sport Thanks: 0 Thanked 1 Time in 1 Post	Amperage advice Ladies and Gents, After a little amperage advice/help/recommendations... Basically, the system thus far: 2x Alpine Type R 10" DVC 300w rms each 1pair Alpine Alpine SPR17LS components 50w rms each... Thats it, nothing to major, but I want just 1 amp to give adequate power to all of the above... In a nut shell would I need a 4 channel amp cable of 700w route means square (sorry, wanted to feel clever ) bridge two channles for 600w rms and the other two for the components at 50w rms each?? Or am I barking up the wrong tree entirley? Any help would be great, cheers __________________ Having a little break, concentrate on the more important things in life, swmbo and my training. See you soon folks, take care - James

24-05-2005, 22:01	#2
Grant Briskodian Join Date: Dec 2004 Location: Huddersfield Posts: 247 Members Car: Fabia Comford TDI Thanks: 0 Thanked 3 Times in 3 Posts	I'd recommend getting two amps, a digital amp for the subs and another (analogue) for the fronts. This way is more flexible as you can choose amps that suit your power requirements and wallet. Do you know what impendence your subs are, e.g single voice coil 4 ohm.? Have a look on www.talkaudio.co.uk, their very helpful! __________________ 51 plate Silver 1.9TDI PD100 Comfort Not that special - but it ain't broken!

25-05-2005, 13:51	#4
eatsoot04 Briskodian Join Date: Dec 2004 Location: nr Manchester Posts: 835 Members Car: Thanks: 0 Thanked 0 Times in 0 Posts	good choice of subs mate! LOUD & clear __________________ Alex Revo Chilly Alpine ICE Cupra Intake Green Cotton Filter RS6 wheels 184 BHP

25-05-2005, 18:28	#5
bengie splash!!!! Join Date: Feb 2004 Location: planet earth Posts: 15,255 Members Car: 4x4 turbo estate Thanks: 17 Thanked 144 Times in 125 Posts	get seperate mate, do you have the subs yet? really you want 4ohm subs, then you could bridge em down to 2ohm each and then bridge the pair down to 1ohm to get the most of them but this obviously requires a 1ohm stable amp, then get a 4 channel amp to run the components at the front. a bit priceir but by far the best way of doing it __________________ owner of a skoda octavia 4xvrs3

25-05-2005, 18:53	#6
CupraR-Rog Briskodian Join Date: Mar 2004 Location: Somerset Posts: 609 Members Car: Renault Laguna 1.9dCi ST Dynamique & Citroen C5 VTR Estate 2.0HDi (company car - not by choice!) Thanks: 0 Thanked 0 Times in 0 Posts	Not many, if ANY amps will be stable when bridged at 1 Ohm - this will really restrict your options!! However, if your subs can be run at a total load of 2 Ohms, then this option is still open for you. Best bet would be to get a single channel amp for your subs, and a 2 channel amp for your components. Don't be afraid of running a higher wattage amp than your subs / speakers are rated at - just have the gains turned down a little!! (I currently run 600W into a 500W sub (soon to be dual subs tho!), and 75W into 60W (I think!) components). As you're not going to be running any bass to your components (make sure you get an amp that has high pass filters!), you can afford to crank the power up that bit higher! Just listen out for distortion when you're setting your gains!! Alternatively, if you really want to splash out... Get a 4 channel amp for the components, and mount the crossover before the inputs... that way your can run your mids and tweeters from seperate channels, giving you a better sound, and more scope to tweak the settings! However, if that's then the route you want to go, you could then look at 5 channel amps. I run a Directed 1100d5 which serves me well. Good luck, and remember, don't rush in to anything! __________________ Some people say I'm stark raving bonkers... ...the others just smile and nod...

25-05-2005, 19:02	#7
bengie splash!!!! Join Date: Feb 2004 Location: planet earth Posts: 15,255 Members Car: 4x4 turbo estate Thanks: 17 Thanked 144 Times in 125 Posts	the thing to remember when setting up the subs wiring wise is the ohm's make a massive difference, rog you say your putting 600W into your sub, is your amp capable of that at 1ohm,2ohm or 4ohm?? as you double the ohm you halve the wattage output so an amp that puts out 600W at 1ohm is only capable of running 300W at 2ohm and 150W at 4ohm directed do some nice 1ohm stable amps that are very good sound wise and also not too pricey __________________ owner of a skoda octavia 4xvrs3

25-05-2005, 19:11	#8
CupraR-Rog Briskodian Join Date: Mar 2004 Location: Somerset Posts: 609 Members Car: Renault Laguna 1.9dCi ST Dynamique & Citroen C5 VTR Estate 2.0HDi (company car - not by choice!) Thanks: 0 Thanked 0 Times in 0 Posts	600W at 1 Ohm, into a dual-2 Ohm sub wired in parallel, i.e. 1 Ohm. On the landing (well away from my computer after what just happened to my TV!) I have 2 x Dual-4 Ohm subs, which will be all wired up in parallel to still give a 1 Ohm load to the amp, but with 2 subs instead of 1. __________________ Some people say I'm stark raving bonkers... ...the others just smile and nod...

25-05-2005, 19:14	#9
bengie splash!!!! Join Date: Feb 2004 Location: planet earth Posts: 15,255 Members Car: 4x4 turbo estate Thanks: 17 Thanked 144 Times in 125 Posts	good going rog, thats the setup i'll end up with soon __________________ owner of a skoda octavia 4xvrs3

25-05-2005, 22:17	#10
walkie ............... Join Date: Aug 2004 Location: Monday: MK Tuesday: MK Wednesday: MK Thursday: MK Friday: MK/Home Saturday: Home Sunday: In bed ;o) Posts: 6,606 Members Car: BMW 120D M-Sport Thanks: 0 Thanked 1 Time in 1 Post	Crikey, lots to think about their, cheers for the advice Mr Cupra R Bengie, not got the subs yet, here's the deal i am going for: 2x http://www.cel-direct.com/shop1.asp?s_page=subsize.asp They are DVC and cabable, I believe of 2ohms, judging from the part no, and Alpines website: http://www.alpine-europe.com/content...Ohm%2B4Ohm.htm So could they be bridged down to 1ohm? Sorry am a little lost here Cheers for the help __________________ Having a little break, concentrate on the more important things in life, swmbo and my training. See you soon folks, take care - James

25-05-2005, 22:37	#11
CupraR-Rog Briskodian Join Date: Mar 2004 Location: Somerset Posts: 609 Members Car: Renault Laguna 1.9dCi ST Dynamique & Citroen C5 VTR Estate 2.0HDi (company car - not by choice!) Thanks: 0 Thanked 0 Times in 0 Posts	They could be bridged down to 1 ohm EACH, which means you have 3 options of what to show your amp... 0.5 Ohms Parallel (good luck finding an amp stable at that!) 2 Ohms... Series coils, parallel subs... Hmmm... not good if you have an amp that's 1 Ohm stable... but good if you haven't!! 8 Ohms all series... Don't go there!! If you get 2 of the dual 4 ohm versions, You can parallel up the coils on each sub to give a 2 ohm load. Parallel the subs again when you connect them to the amp and the amp will see 1 ohm load. BUT... NOW is the time to choose your amp!! If you get an amp that's only 2 ohm stable, then get 2 of the dual-2 Ohm versions. If the amp is 1 Ohm stable, then get a pair of the dual- 4 Ohms. Hope that makes sense!! __________________ Some people say I'm stark raving bonkers... ...the others just smile and nod...

25-05-2005, 22:39	#12
tfboy C+ à Paris! Join Date: Sep 2003 Location: Tilehurst, Berkshire Posts: 6,326 Members Car: "Fake" Black Magic vRS Thanks: 21 Thanked 77 Times in 67 Posts	James, you daft sparky If you get the 2ohm DVC, then you can wire them in parallel for 1ohm (1/R = 1/r1 + r/r2 = 1/2 + 1/2 = 1 ) for series for 4ohm. You'd only really want the 4ohm DVC to wire in series if you amp can only do 2ohm stable May I give a plug to some friends of mine who do some rather nice Voodoo sub amps? I've heard them running 4 sony xplods (which aren't renowned (sp?) for their thumpiness) and I can't sit in the car they're that evil edit re-reading MR Cupra's post, I forgot you were talking about a pair of DVC subs. If you want two, then you have to do the numbers game and work out your amp requirements. IMHO, unless you want to go silly loud, one sub is more than enough to fill the car and still have some decent SQ. As I said, vrs_si who's the voodoo man has 4 subs but I think he's bordering on insanity __________________ Xavier Last edited by tfboy; 25-05-2005 at 22:42.

25-05-2005, 22:50	#14
tfboy C+ à Paris! Join Date: Sep 2003 Location: Tilehurst, Berkshire Posts: 6,326 Members Car: "Fake" Black Magic vRS Thanks: 21 Thanked 77 Times in 67 Posts	800W or 1kW Class D monoblock amp 1ohm stable. Should do nicely I guess the bad point is it's the wrong side of £300 new Any idea how much you want to spend on the amp(s) ? __________________ Xavier

25-05-2005, 22:55	#15
bengie splash!!!! Join Date: Feb 2004 Location: planet earth Posts: 15,255 Members Car: 4x4 turbo estate Thanks: 17 Thanked 144 Times in 125 Posts	as said i have twin 10's and i don't think i'd go for anything else in the future as long as they fit __________________ owner of a skoda octavia 4xvrs3

25-05-2005, 23:01	#16
walkie ............... Join Date: Aug 2004 Location: Monday: MK Tuesday: MK Wednesday: MK Thursday: MK Friday: MK/Home Saturday: Home Sunday: In bed ;o) Posts: 6,606 Members Car: BMW 120D M-Sport Thanks: 0 Thanked 1 Time in 1 Post	Well tbh this was planned to be a budget install Sound deadening £50.00 (flashing tape or something lol) Wiring £50-75ish Components £110 Sub/subs £300 Amp/amps £350 I think I may have to be looking at 2nd hand for the amp's... The brains is an Alpine CDA-9831R __________________ Having a little break, concentrate on the more important things in life, swmbo and my training. See you soon folks, take care - James

26-05-2005, 00:03	#17
bengie splash!!!! Join Date: Feb 2004 Location: planet earth Posts: 15,255 Members Car: 4x4 turbo estate Thanks: 17 Thanked 144 Times in 125 Posts	james, i am expecting to get my alpines pretty soon if you want to hear before you buy __________________ owner of a skoda octavia 4xvrs3

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26-05-2005, 15:26	#20
bengie splash!!!! Join Date: Feb 2004 Location: planet earth Posts: 15,255 Members Car: 4x4 turbo estate Thanks: 17 Thanked 144 Times in 125 Posts	alpine's are nice and powerfull __________________ owner of a skoda octavia 4xvrs3

26-05-2005, 23:27	#21
bengie splash!!!! Join Date: Feb 2004 Location: planet earth Posts: 15,255 Members Car: 4x4 turbo estate Thanks: 17 Thanked 144 Times in 125 Posts	got my new subs today and got them in already will get some pics tomorrow in the sunlight, must say they look quite swanky and nice. they definitly sound nice and powerfull but not sure about my amp now, think it may need some additional cooling as it occasionaly cuts out for a second then goes on again like normal. my amps are under a false floor. __________________ owner of a skoda octavia 4xvrs3

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