Crossovers for amp

[vupham]

Hey guys, atm my alpin emrv 545 is set at 40mhz for both front and rear speakers. Whats the reasonable frequensy for front and rear speakers without blowing it up?

[vupham]

Oh when talking about frequensy and audio term. Is higher meaning higher number, eg. Higher than 100mhz is 100+ or 100-?

[vividjazz]

Check your speaker specs for crossover point. You don't say what size speakers 4", 5", 6", 6x9". Bigger the speaker the lower the frequency it can handle (generally). No point sending them frequencies they can't play.

[vupham]

This is my first sound system for my car so im completely noob. I listed the spec below, where can u find what out what frequencies they can handle.

My front are boston pro60:
Speaker Size
6-1/2"
Rated RMS Power Handling
125 watts
Nominal Impedance
3 ohm
Frequency Response (3dB in car)
50Hz-22kHz
Mounting Cutout Diameter
5" (127mm)
Mounting Depth
2-3/8" (60mm)
Mounting Depth with Spacer
2-1/16" (52mm)
System Type
2-way

My Rear is Poioneer TS-d161s
2-Way Coaxial Configuration
260 Watts Max. Power Handling
60 Watts Nominal Rating
Frequency Response 27 - 32,000 Hz.
Efficiency 90 dB
Impedance 4 Ohm
fo (Lowest Resonant Frequency) 74 Hz.
Crossover Frequency: 2,500Hz

[vividjazz]

Start by looking at the frequency response ranges. 50Hz-22KHz & 27-32,000Hz. Now your not going to get optimal sound across that whole range. This is where those pretty graphics they put on the outside of the box or on the spec sheet can help.

Also are you running any subs? as you want to feed your lower frequencies just to them.

I reckon its worth getting a system professionally tuned especially if you've invested in good gear like you have with your bostons. Small price to get the most out of it.

[vupham]

Yah im planning to get pro to tune it for me but got to save up money for my sub and amp. im planning to do it when i got the sub and amp and get them to tune it for me too. Atm i just wanna do some to sound good, like get less bass from my front and rear

[vividjazz]

Around 80Hz is often the crossover point between the subs and other speakers but in your case the Pioneer specs pretty much say 74Hz is the lowest they go.

Its going to be one of those things you set. Listen to and then adjust. Ears are the judge.

Some sound proofing will help the sound quality heaps too. I'm just amazed at the amount of 'professional' places that don't push the importance of sound proofing.

[vupham]

Yeh im in QLD, i dont know many good places that do pro job tuning or installation. I got my system installed but it ws just installed, and the guy said he tuned my system but doubt he did, my amp cross overs for my speakers are 40mhz on all 4 channels o_O And i asked about sound proofing and he said u dont need to o_O so i just left as it is untill i get my sub and amp and try northfield, apparently they seem to sounds more pro than strafielth.

[Bol]

Ive got Boston Rallys (one series below yours) crossed at 65Hz and thats a bit low, pity the amp is a bitch to get to :p

But if you are unsure what you're doing, then try get someone else to tune your system.

[vividjazz]

Try these guys in QLD. http://www.advanceae.com.au/.