Hey All,

Just wondering I have a set of boston s60's with a Jaycar 2x150WRMS amp. The speakers are rated at 55WRMS with a "peak" of 150W. Just wondering I have turned the gain down, I sometimes like my music up loud, but not for long periods of time, would it be ok running this or should I refund my amp and get a 2x80WRMS?

Thx In advance :D

Probably but to get the only accurate answer would be to measure the power coming out at your loudest used setting. Also your amp will never really use all of it's power unless your gain is up and you give it the voltage it was tested with (usually 14.4 which is won't be recieving) and you give it max signal power, 'cause it goes something like this.

Gain @ 50%, it will make 50% of it's power at full chat when your HU is sending max signal strength, then again, depends on how it was designed, but I'd just put the gain at 1/4 so it'd atleast make some noise when turned up but won't be making 150wrms. Basically did this with my JL10W3, put the gain @ 50%+- (sub rated @ 300wrms amp @ 500wrms) so when i turned it up it was only making 60% of the power but I never completely turned it up so it wasn't even making that.

No way, keep the amp mate. You can never have enough headroom for your speakers. As long as you have your gains set right, they should be fine even at full volume from your hedunit. Just means that your amp wont need to work as hard to get the speakers going at their best, which is a good thing!

Your always better off having a more powerful amp or head unit (in my opinion) than what you speakers can handle IF you are careful and know what you are doing. Dont distort it and don't crank it up hell loud straight away, test it when you get it and see where your speakers limits are and make sure you dont push it over that volume and you will be fine.

As what D-VAN said, your amp wont have to push to its limits to get the speakers cranking.

Ok thanks for the responses. Found them very helpful.

I have another question, where do the tweeters go, do they screw into the exisiting pods? e.g. the fillers the stock things that are there in place? Or do I need to make my own holder? or what?

Thanks in advance.

I mounted the tweeters on the old FS-60 down in the kick panels, being a harsh tweeter I would not advise you to mount them in the A pillar, even if you can set them at -6db. If you unsure where that is, I can find you a picture I suppose.

I ran mine at 65WRMS per side and they sounded like they wanted more juice for even more mid-bass!

To late put them on the dash :P, now I gotta redo my earth i think, getting a hissing sound from tweeter.

Lol never woulda noticed that with sub :P

To late put them on the dash :P, now I gotta redo my earth i think, getting a hissing sound from tweeter.

Lol never woulda noticed that with sub :P

Not on the dash, in the kicks. Ill see if I can find a pic. This is the drivers side of a GTV.

Hissing sound from the tweeter will be from where you have mounted your xover most likely. Move the crossover and see if it improves.

Thats where i mounted my cross over....

And I didnt leave any slack on wiring ........ oh man ive f**ked up bad :P

Thats where i mounted my cross over....

And I didnt leave any slack on wiring ........ oh man ive f**ked up bad :P

Ha its not bad. I would just consider mounting the tweeter there and the xover goes well behind the plastic bits near it ( there is nice gap there ). :D

Could you maybe quickly point out in paint where it goes :P

Note: Hissing sound is there even when engine is off...

Could you maybe quickly point out in paint where it goes :P

Note: Hissing sound is there even when engine is off...

Easiest thing to do is to move it around until there is no sound. It is noise from electrical components and having the car on / off will not have any barring on it. If you can not move it fair enough, you may need to add more wire so you can.

The bit I'm talking about is the bit of plastic attached to the bit that you pull up on the door sill.

Asked around and everybody says grounding.... but I doubt this, will try it tommorow im getting fed up with wire, i used like 12AWG and its so thick impossible to wire and :redface:. I don't have time to rewire, but I guess it would be easier. What wire size should i be using...

Asked around and everybody says grounding.... but I doubt this, will try it tommorow im getting fed up with wire, i used like 12AWG and its so thick impossible to wire and :redface:. I don't have time to rewire, but I guess it would be easier. What wire size should i be using...

Groundings are the cause of 99% of problems however I know from doing myself that it will more than likely be the xover interference causing you the problem ( had the same problem with my older FS-60's and we had to play with the SL-60's to make sure as well ). We just moved it and it was fine.

Anything 16AWG or bigger will be fine.

A good way to check grounding is using a multimeter. Run your power and meter the earth point you're thinking of, if you get anything less than what you get on your battery (roughly) don't bother, grab the sandpaper and give it another hit. Unless you don't care about your stereo sounding like garbage that is..

I'm thinking that it's the Jaycar amp... The Jaycar amps have a good S/N ratio at thier rated output but it doesn't have quite a good rating at lower levels of music, which is where the power circuitry can create a hissing "low Fi" sound at ambient levels of playback...

Check out this thread (http://www.mobileelectronics.com.au/forums/index.php?showtopic=65863&st=20&p=884531&#entry884531)for more info. on the Jaycar amps making noise issues...

The big problem is that the Jaycar amp has been coupled to an AMAZING set of splits(which IMO are the best set out there in that price range), and those splits, (and tweeters in particular) are showing up flaws in the rest of your system.

I've also got a set of the Bostons, and although they are a bit different with some specs, a lot of the fundumental planning into the crossovers has been the same throughout Boston's entire range. When I was in their R&D plant last year, I was dumbfounded on how much effort they put into reasearching ways on lowering the problems that crossovers can create.

I was gobsmacked when I was shown that particular components on the circuit cards of the crossovers (Pro60) had been placed in such a fashion as to limit crosstalk, not only from internally, but from outside influences such as engine whine, fuel pump solenoids, radio freqs from ECU's and alternators, fans... they really REALLY care about their products. I highly doubt that the crossovers are the cause of your problem. The only drawback of the FS-60s are the fact that they are highly efficient, so they will play unwanted noise at a more substantial level to what other similar speakers would.

The only thing I can suggest is to cope with your set up as is until your budget allows you to get a better amp. I went with an amp which displayed a good s/n rating according to the CEA-2006 standard of testing. The Jaycar amps don't comply with the CEA-2006 standard, which tells me that they probably have a bad s/n ratio under scrutiny. I reckon it would be close to about 65-70dB s/n ratio at 1watt, and get better with amplification to it's a50WRMS per side, where the noise will be masked, and therefore a higher (90dB) noise ratio will be obtained...

When i Plugged it in to my other amp no hissing was evident. They are exactly the same amps.

When i Plugged it in to my other amp no hissing was evident. They are exactly the same amps.

Where the gains set the same?

Did you install your stereo yourself or did someone do a "professional" job? Could be a busted input cap in the amp. It usually happens when you mix up your earth and your ground into the amp...:doubt:

Gains were both at 0.

You mean positive and ground?

I installed it my self.

:D
Gains were both at 0.

You mean positive and ground?

I installed it my self.

Yeah sorry have been smoking to much crac. Yeah mixing up the power cable and the ground. If your gains are set to zero and you hook them up to exaclty the same cables and you still get the noise then something is wrong with that amp. I would just take it back and get it swapped :D

:D

Yeah sorry have been smoking to much crac. Yeah mixing up the power cable and the ground. If your gains are set to zero and you hook them up to exaclty the same cables and you still get the noise then something is wrong with that amp. I would just take it back and get it swapped :D

X2. Check the wiring isn't letting you down by swapping the known "good" amp in the same place, with the same wiring as the "questionable" one was.

Yeah I'm going to do that today, thanks. This interfeerence isnt distroying my speakers is it?

nah... Just would be anoying for ya.