Discussion in 'ICE, Sat Navs & Dash Cams Forum' started by backtothefuture, Feb 8, 2003.
was thinking of getting one for my ICE
anyone have experience with em>?
It looks as though it may be an 'Perfect 12' which is housed in the enclosure.If it is i'd say go for it as a mate had a Perfect 10 in a sealed enclosure which was a fine sub and iirc it cost him around £80 for the speaker it's self.
Go for it, that is a Infinity Perfect 12, they are great sounding subwoofers.
I got the Perfect 10 when it first came out and it is still sounding great over 2 and a half years later.
Give the sub a good amount of power to shine, I recommend about 400 watts rms.
Any questions just ask.
its only rated at 300rms
The advertised 300 watt rms is a very conservative rating.
I have run the Prefect 10 with 280 rms and it can take quite a fair bit more.
In the original Infinity white papers the Infinity Perfect 10 and the 12 were powered with 350 and 400 watts RMS amplifiers, I have known people use up to 600 wrms on tap this works fine, as long as the power is was clean, max excursion was watched and the enclosure used was not bigger than 1 cubic foot.
400 watts RMS should be right for decent clean SPL's of around 125-135 db from 20hz to 80 hz in most cars depending on the cars transfer function.
In general as a sealed enclosure gets bigger the power handling of a subwoofer falls but low bass extention is increased.
what kind of an amp would you recommend for the beast then ? a link would be cool
Do you need an amp ?
that would be quite useful unless they forgot to mention its 'active'
How much are you willing to spend on a subwoofer amplifier?
An amplifer which provides 400-500 rms will normally set you aound £250-£350.
You want a amplifer that puts out decent power at 4 ohms normally this would be a two channel amplifier bridged to mono.
I have found these at the Car Audio Direct website, these amplifers would be the ones I would consider for some good output.
A Directed 2400 for £279 pounds.
A Lightning Audio s2.400.2 for £259.
A Lightning Audio s2.600.2 for £359.
Rockford Fosgate Punch 500S for £299
Rockford Fosgate Power 350S for £299
Rockford Fosgate Power 550s at £349.
If you have any other questions or queries don't hesitate to ask.
I was already going to get a Phoenix Gold QX300.1 4 channel to power my front 17cm comps and rear 17cms...
do you mean I need one of those amps (that you gave a link for) just for the sub itself!?
I've been told to use a crossover with the h/u and to use the Phoenix Gold to power the fronts and bridge it for the rears/ sub
You can bridge the rear channels of the amplifier, but doing this does not really give the power to run both the rear speakers and the Subwoofer to anyway neer their potential.
You also run into problems with the sensitivity difference of the rear speakers and subwoofer.
The subwoofer will sound much better with a dedicated amplifier.
To get the most out of your sound system you need a 4 channel amplifier for front and rear speakers, and a seperate subwoofer amplifer for the subwoofer.
If you want matching Phoenix Gold amps for both speakers and subwoofer, a Phoenix Gold QX350.2 would power the Perfect 12 nicely at £259.
actually , I was going to use my Alpine 7894 h/u to power the rears with a crossover and let the Phoenix Gold handle the fronts and sub... how does that sound?
you might want to try these guys
i bought my headunit off them last year, their prices were AT LEAST £100 cheaper than elsewhere. I ordered on a friday lunchtime and the headunit was at my door at 7.30am the next morning. They also answer emails fairly quickly.
great link mate
the Alpine V12 500w sub amp looks very tasty at £264 or maybe the 700w Rockford for £299.
You can do it that way but the headunit may distort the rear speakers at a reasonable listening level.
A dedicated amplifier for sub will sound better if you can get one.
why should i go for an amp for a decent output at 4ohms as opposed to 2 ohms? ie what difference does the ohms make if power output is the same?
it means you can run another set of speakers in series (or is it the other one) safely. some of the better amps run "half ohm stable" which means you could run four stereo pairs off of one stereo channel.
ok this is what i got so far:
Alpine 7894RB h/u with CD changer ; Boston Acoustics FS60 front components (with crossover); I have a pair of Kenwood components that I am only going to use the midrange of for the rear speakers; Infinity Perfect 12 SUB
in terms of amp I'm going for a Phoenix Gold QX300.1 4 channel and intend to run all 4 speakers of it , using the crossover for tweeters infront.
interms of 2nd amp i'm thinking of going for the same but in a Mono version , or should I go for an Alpine V12 300RMS? .. I don't need a crossover for my amp do I??
When wiring subwoofers in series it increases the ohms load and reduces the power provided by the amplifier, wiring in parrellel decreases the ohms load and increases the power from the amplifier.
An amplifer is rated to certain ohm level either in a stereo or bridged mode.
So an amplifier which is can run 2 ohms in stereo can be run safely in bridged mode at 4 ohms mono.
If you ran the said amplifier at either 1 ohm stereo or 2 ohms bridged mono it would cut out and possible burn/catch fire.
Good monobloc (single channel) amplifiers are often very flexible, they can give greater power into lower ohm loads safely (e.g. 1/2 ohm stereo and 1 ohm bridged mono), so a big mono amplifier can run 300 RMS to single 4 ohms subwoofer, or 600 RMS to two subwoofers wired in parrellel to 2 ohms or 1000 RMS to three 4 ohm subwoofers wired in parrellel to a 1.33 ohm load.
The Infinity Perfects are 4 ohm subwoofers so you want an amplifier that give most of its power at 4 ohm.
Normally for 4 ohm subwoofers this is 2 channel amplifier bridged to 4 ohm mono, the perfect amp would be the Phoenix Gold QX350.2 or if you are on a budget the Alpine V12 MRV-T420 at £169.99 at cell-direct will sound pritty good.
jeez no wonder I failed physics
There is a great wiring subwoofers turorial at the JL Audio website if anyone is interested.
Here you go.
very handy cheers
can u guys recommend a good PUNCHY sub for chart/pop music and rock ?
I tried out the Infinity Perfect 12 in my existing setup and find it a bit lethargic... hence am having it returned ...
Something doesn't sound right here What amp did you use to drive it ?
well to try it out in my existing ICE, I think it was the Radiomobile 4 channel , bridged since the Kenwood PS150 was busy driving the front component speakers
I did put back my 10" Kenwood in there and it sounded a bit better
Can you supply a link to this amp ?
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