Is 8 inches enough?

nanl2053 · 28th June 2010, 10:38 PM

I am primarily a home audio guy (Zaph B3S at the office, Frugal Horns in living room) but just got a '06 350Z and want to upgrade the system. Hoping I could get some guidance from you all. I am just looking for good clean sound at moderate SPL and moderate price, not to rattle the windows of the house a block away.

Here's what I am looking at:

JVC-KD-R610 Head unit
Infinity Reference 6.5" (front doors)
Infinity Reference 8" Sub
Jensen Power400 Amplifier

Plus a custom built MDF box to fit where the stock sub would go (behind drivers seat), dynamat around enclosure and door speakers and all associated wiring, adapters, mounting hardware, etc.

Any thoughts / input on this setup? Main thing I am debating right now is going with a 10" sub versus 8". Limitation is that I only have about 1.1 CF to fit the sub box in and that is pushing it.

TIA

FairfaxStu · 28th June 2010, 11:26 PM

That is a loaded title for a message if I ever heard one

I am not a big fan of Jensen amps - were you planning to drive the sub with it? I would recommend you step up to a real amplifier that is capable of both driving the door speakers and the sub. What is your budget?

nanl2053 · 29th June 2010, 12:48 AM

haha, made you look :-)

I figured the Jensen was probably the weakest link. I was hoping to drive the front speakers off the HU. I could be convinced to spend a bit more (maybe 100-150) if I could find something to drive both the sub and door speakers.

1moreamp · 29th June 2010, 01:07 AM

I have seen a 8 fill a suburban with bass with all the doors open with just 200 watts driving it.
I guess it all depends on how you install it and set it up. We did these custom for a reseller in Santa Cruz. 7th order enclosure mounted under the rear passenger seat, outside the vehicle and just ported under the seat. The enclosure was mounted in a aluminum box bolted to the bottom of the truck body < 4 wheel drive >
All you saw was a small 5 inch grill painted to match the carpet. Corners were old school MB quarts 90's versions. its been a while since these were done. Amp was old school ADS plate 6 channel amp 50 WPC, 2 channels bridged to drive the 8 inch sub.

The install was clean, neat, and un-noticeable to the casual observer. But it was fairly loud and had very good SQ for what it was..

So yes a 8 will do nicely if installed properly. Hope yours does as well...

28th June 2010, 10:38 PM	#1
nanl2053 diyAudio Member Join Date: Nov 2006	Is 8 inches enough? I am primarily a home audio guy (Zaph B3S at the office, Frugal Horns in living room) but just got a '06 350Z and want to upgrade the system. Hoping I could get some guidance from you all. I am just looking for good clean sound at moderate SPL and moderate price, not to rattle the windows of the house a block away. Here's what I am looking at: JVC-KD-R610 Head unit Infinity Reference 6.5" (front doors) Infinity Reference 8" Sub Jensen Power400 Amplifier Plus a custom built MDF box to fit where the stock sub would go (behind drivers seat), dynamat around enclosure and door speakers and all associated wiring, adapters, mounting hardware, etc. Any thoughts / input on this setup? Main thing I am debating right now is going with a 10" sub versus 8". Limitation is that I only have about 1.1 CF to fit the sub box in and that is pushing it. TIA

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28th June 2010, 11:26 PM	#2
FairfaxStu diyAudio Member Join Date: Feb 2010 Location: Fairfax, VA	That is a loaded title for a message if I ever heard one I am not a big fan of Jensen amps - were you planning to drive the sub with it? I would recommend you step up to a real amplifier that is capable of both driving the door speakers and the sub. What is your budget?

29th June 2010, 12:48 AM	#3
nanl2053 diyAudio Member Join Date: Nov 2006	haha, made you look :-) I figured the Jensen was probably the weakest link. I was hoping to drive the front speakers off the HU. I could be convinced to spend a bit more (maybe 100-150) if I could find something to drive both the sub and door speakers.

29th June 2010, 01:07 AM	#4
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	I have seen a 8 fill a suburban with bass with all the doors open with just 200 watts driving it. I guess it all depends on how you install it and set it up. We did these custom for a reseller in Santa Cruz. 7th order enclosure mounted under the rear passenger seat, outside the vehicle and just ported under the seat. The enclosure was mounted in a aluminum box bolted to the bottom of the truck body < 4 wheel drive > All you saw was a small 5 inch grill painted to match the carpet. Corners were old school MB quarts 90's versions. its been a while since these were done. Amp was old school ADS plate 6 channel amp 50 WPC, 2 channels bridged to drive the 8 inch sub. The install was clean, neat, and un-noticeable to the casual observer. But it was fairly loud and had very good SQ for what it was.. So yes a 8 will do nicely if installed properly. Hope yours does as well...

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