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Old 23rd February 2012, 06:41 PM   #111
diyAudio Member
Join Date: Jun 2011
Location: amsterdam
I'm enjoying the 7.3's in a 10 liter bass reflex for a few months now, but all this FAST talk has made me sort of hungry..;-)

Few questions:

-The peerless 10 & 8 inch look great, and the price is good. What would be the differences soundwise between the two?
Somehow my gutfeeling tells me the 10 inch will go lower, but the 8 inch might sound a bit faster.

-I'm not able to use a minidsp (or i would need to build a new amp..), so a first order XO would need to do the trick.
What i get is a 5.09 mH inductor, and a 117 uF cap if i cross at 250hz, does this sound correct? I took the nominal impedances form the specsheets, however since one crosses at a certain point, doesn't that change the effective impedance?

-Are there some budget tricks to experiment with different crossovers? What i mean is for instance testing with electrolytics before plunging out big cash for audiophile grade xo caps? It is going to cost a few bucks this crossover as far as i can tell now..

And thanks all for the info in this topic, learned a lot!
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Old 24th February 2012, 03:51 AM   #112
diyAudio Member
Join Date: Feb 2011
I have not tried the 8" but the 10" works pretty well. There is a bit of efficiency difference between the two, but not much difference in deep response given the same size cabinet. The 10" is a really nice driver that can be crossed pretty high if needed (makes 1st order easy). The 10" will also provide more headroom than the 8".

A single 10" should work pretty well with an Alpair 7. For a 1st order at 250hz, 5mH on the woofer would be OK and you might just get a single 100uF (Solen makes one) for the Alpair 7. If I were building another system, I might use a 90 litre sealed box with a generous amount of that recycled denim insulation loosely packed.

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Old 25th February 2012, 10:19 AM   #113
diyAudio Member
Join Date: Jun 2011
Location: amsterdam
Thanks Silverhairbp!
In your experience could the 10" work in a fully stuffed enclosure a bit under 40 liters? If i put that in a calculator i get a bump around 100 herz.

I probably might end up using the 8" although i like the idea of surface instead of excursion for bass a lot better.
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Old 25th February 2012, 08:49 PM   #114
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Join Date: Feb 2011
IMO, the 7.3 is better matched with the Peerless 10" 830668 because of baffle step loss. The 10" will work in 40 litres sealed but will have a steeper rolloff down deep. F3 of around 43hz F10 in the upper 20s. Haven't tried a small box with the Peerless but modeling makes it look like there is less dynamic restriction with a larger box. Not a particularly good idea for deep bass unless the intent is to restrict driver excursion.

And I agree. My personal preference is for shorter excursion with larger speaker area.
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