linh811

I would hope so.... The only passives I'm aware of that are 'twice as expensive' are the TCSounds and Bostons... Parts express carries quite a few passives for much less, actually..... and many on the home theatre forums have used the cheaper parts express passives very successfully. I want to go with Nick's 'custom' Fi passives for appearance's sake - the BL and the passives will hopefully look the same, with the same white Fi logo embossed on the front... I will have to contact him to confirm that the passives will 'look' just like a regular BL driver, even if it means paying 'twice as much.' thanks everyone, again, for your input. Nick, you will be receiving my email shortly. Linh

I finally got around to ordering the BL, was too busy at work yesterday.... Nick should be getting my email shortly for the passives.... I've been in home theatre for a long time, and it's not uncommon at all for those guys to go with 4x Vd. That's why I'm going with a 12" BL and 2 15" passives....

I spend most of my time in home theatre, relatively new to car audio, where the rule of thumb has always been at least double the cone area. Many guys on the home audio forums have as much as 3-4 PRs per active driver. But then again, for HT we're looking for flat responses down to 15hz.... You know what I'm trying to accomplish (ported SPL from a BL driver, but in a shallow as possible enclosure). I can dedicate about 2.5cf gross volume for the box, larger if absolutely necessary. Can you make me a pair of 15" PR's, and give me recommendations on which options to get with the 12" BL. I'll be running a USAmps 4000DE (1ohm, 1600wrms) I'd like to place the order ASAP (today if possible). thanks, Linh

would going with 2 15" PRs or a single 18" PR lessen the likelyhood of having to attach so much weight to the end of the spider for low tuning? Again, my size constraint is depth, not width or height, so I have room for multiple PRs.... I'm considering a 2.5cf box, a single 12" Bl on 1 side, and 2 15" PRs on the opposite side.... I'm trying to create a shallow of a box as possible... thanks again for your thoughts Linh

would going with 2 15" PRs or a single 18" PR lessen the likelyhood of having to attach so much weight to the end of the spider for low tuning? Again, my size constraint is depth, not width or height, so I have room for multiple PRs.... I'm considering a 2.5cf box, a single 12" Bl on 1 side, and 2 15" PRs on the opposite side.... I'm trying to create a shallow of a box as possible... thanks again for your thoughts Linh

Yeah that was the exact idea, to have the SPL of a ported box but the size of a sealed box. I'm assuming the weight of these PRs are much lighter than the BL with it's spiders, coils, and motor etc.... Can you please elaborate on why "forces in the car" would be any different for a PR versus a regular driver? Also, do you see a problem with using a BL with a PR instead of a traditional port? Or am I still better off with a Q and a PR? thanks again, Linh

I know that Fi recommends ported for BL's, but for space reasons, I'm wondering if I could do a BL in a sealed box with one of TCSounds PRs (passive radiator). This will be running off an USAmps 4000DE (1600wrms). For space reasons, my plan was to go with a 12" BL in a sealed 2.5cf box, with a TCSounds 15" PR (or VMP as they call it) http://www.parts-express.com/pe/showdetl.cfm?Partnumber=293-682 http://en.wikipedia.org/wiki/Passive_radiator_(speaker) For those too lazy to click on the PR link "Passive radiators are used instead of a reflex port for much the same reasons—to tune the small volume and driver for better low frequency performance. Especially in situations in which a port would be inconveniently sized (usually too long for practical box configurations). They are also used to eliminate port turbulence and reduce motion compression caused by high velocity airflow in small ports (especially small diameter ones). Passive radiators are tuned by mass variations (Mmp), changing the way their compliance interacts with motion of the air in the box. The weight of the cone of the passive radiator should be approximately equivalent to the mass of the air that would have filled the port which might have been used for that design." Or would I be better off with a Q in the exact same enclosure with the same PR? Basically I'm trying to get the SPL of a BL in a ported box, but don't have room for a ported box, so I'm trying to get away with using a 15" passive radiator. Height is not the issue my in trunk, but depth is. Would a 18" PR work any better? I listen to all sorts of music, but would like as flat a response as possible from about 25-75hz... thanks in advance. Linh

in my shoeboxed sized sealed enclosure, 5.5 gigawatts!!!!!!! free air, 5.5 watts !!!!