4645B Subwoofers question

[sebackman]

Hi,

Unless you need to play stupid loud you can extend the ports about 1-2 inches and add some EQ to compensate. Those big 18's will be than enough in a residential setting without reaching x-max. I have done that on my 2216Nd-1 in the 4367 to dig deeper than in the originals. I have also done that on 4645C (singe port) with good results.

On the amp side my experience is that you should get an amp that can do 1ohm in stable operation or at least 2 ohms @>400w. You don't need voltage you need current to control the heavy cone. I would advise against bridge mode because that gives you more power (voltage swing) but not more current and that is what digs deep. I never use bridge mode for HiFi albeit for PA where power is most important e it has its place. Digital amps are just fine for sub use. I use a Crown CTS3000 for my SUB1500's sub in the other system. And newer digital amps (Ncore & Purify aso) gives any amp at any cost range a run for their money.

Enjoy the weekend
//Rob

[Ian Mackenzie]

In addition to Rob S post have a go at setting up REW on your Laptop and check out your rooms LF response. The latest version now offers comprehensive room modelling which l have found accurate to determine room modes.

[DerekTheGreat]

Hi,

Unless you need to play stupid loud... ...I never use bridge mode for HiFi albeit for PA where power is most important...

I play stupid loud.

I'm also settling in to using four amps bridged mono; two Crown PS-200's and two Crown PS-400's. I haven't noticed any caveats running this way, but have noticed better dynamics & detail. Bass is a smidge faster & punchier and I've noticed better separation/distinction between left & right.