Are this parts ok for my project?

[claustro]

Hi all,
I am Andrea from Florence Italy.
i am totally noob in thies field and before make big mistakes I would like to know if my shopping list is ok
I would like to build a small boombox for using it with my mp3 player.

I am planning to do the enclosure in wood or plastic about 30 cm ( 11 inch) long and 20 high (8 inch)

The very cheap ampli I would like to use is this one Y148 Audio Amplifier Module - Free Shipping - DealExtreme
those are the specs , I am planning to use it with a small heatsink

Quote:
- Adopts YDA148 high-efficiency digital audio power amplifier IC
- DC input voltage: 9~15V
- Current: 2~4.5A
- Power output at DC 15V input: 15W x 2 (8 ohm), 30W x 2 (4 ohm)
- Power output at DC 12V input: 10W x 2 (8 ohm), 20W x 2 (4 ohm)
- Needs heat sink at 4 ohm, doesn't need heat sink at 8 ohm
- Frequency response: 10Hz~20KHz(+/-0.2dB @1KHz)
- Load speaker: 4 / 6 / 8 ohm
- SNR: at least 90dB
- Harmonic distortion: THD+NC no more than 0.1%P=0.1W

I am totaly stuck regarding the speaker, I am unable to decide if I have to use only 2 woofer or 2 woofer + 2 tweeter and crossover. But how much ohm ?
Another option would be a couple of 2 way car speaker.
Can soemone point me in teh right direction for choose the right speaker for this little amp?
Thank you
Andrea

[gmphadte]

U can use any speaker whose nominal impedance is 4 ohms or more. It can be two way or more. Avoid using car speakers as they r more for rough n tough use and sound may not be that good.

Gajanan Phadte

[picowallspeaker]

Hi Andrea
you can PM me since we live near each other
I have some old Pioneer coaxials for car to lend