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<blockquote data-quote="audioholic" data-source="post: 8451092" data-attributes="member: 549629">The general problem with just leaving the rear deck speakers out is, it tends to create an unwanted bandpass effect. Basically, the trunk&#039;s airspace becomes an &quot;enclosure&quot;, and the emptied speaker holes become ports. This alters the tuning of your actual enclosure&#039;s output, often drastically (narrowing the bandwidth and spiking its output).This effect happens if/when the holes thru the rear deck restrict air flow. This creates pressure in the trunk space, which translates into the bandpass effect I described above. To eliminate (or minimize) this, you would want to open up the holes as large as possible. How necessary this is depends on the vehicle and equipment installed. But if you are putting a high displacement subwoofer setup in the trunk, and relying on two 6x9 holes to vent into the cabin, you can be pretty confident it will be an issue.</blockquote>

[QUOTE="audioholic, post: 8451092, member: 549629"] The general problem with just leaving the rear deck speakers out is, it tends to create an unwanted bandpass effect. Basically, the trunk's airspace becomes an "enclosure", and the emptied speaker holes become ports. This alters the tuning of your actual enclosure's output, often drastically (narrowing the bandwidth and spiking its output). This effect happens if/when the holes thru the rear deck restrict air flow. This creates pressure in the trunk space, which translates into the bandpass effect I described above. To eliminate (or minimize) this, you would want to open up the holes as large as possible. How necessary this is depends on the vehicle and equipment installed. But if you are putting a high displacement subwoofer setup in the trunk, and relying on two 6x9 holes to vent into the cabin, you can be pretty confident it will be an issue. [/QUOTE]

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