4628B,4698b,4699B are very good sound systems, do some modification on the crossovers,you will find they are very good home HIFI systems
4628B,4698b,4699B are very good sound systems, do some modification on the crossovers,you will find they are very good home HIFI systems
46 lover
some body make it home HIFI system
46 lover
Existing cabs are about 9 cu ft. so 6 cu ft would be an improvement size-wise. Just wondering if anyone has any experience with non-tuned enclosures like H-Frame or W-Frame dipoles. I've built many tuned cabinets but never an open style. My interest is two fold; small size, and different, more open, sound.
I've always liked the look of the 2342...but I have to say that I've become a little obsessed with the Bella Luna Diamante approach...and I have a friend with a wood lathe I can use. I'm super curious as to how something like this would sound. So who has a Bella Luna Diamante in California? Of course the pictured Diamante uses custom designed drivers for this setup...the 2425/E110 would be quite different. Still, might be a fun project.
I hope so, when I get a minute I'll pull the driver and take a look.
I hear you and agree with you, but, I like the challenge of holding to my design goal of smallest cabinet for these drivers.
My 2405/375/LE15/2245 rig in the living room is quad-amped using a minidsp 4x10 so I would design these to connect to that rig for testing. That will allow trying different crossover frequencies.
MAN! The speakers that have been sitting in the listening room. I was enamored with the Cabaret series for SR. They sounded nice at venue volumes. At home they were well-behaved at normal listening levels. You might try those just the way they are. With room reinforcement you may find they're just fine for you. When Henry Ford would have a meeting with someone at a restaurant, he would observe whether his guest/interviewee seasoned their food before tasting it and made judgements based on that. IOW - it's either - ready, fire aim or ready, aim, fire.
Hi Val,
You'll be happy to know that JBL's recommended enclosure volumes for the E-155 are 3-8 cu. ft. ( 85-225 litres), according to JBL's E Series Instruction Manual, 2/81, P.5. Naturally, the box size you choose will determine along with tuning frequency how low you can go in the bass range...
I modeled quickly in Winspeakerz the 6 cu. ft./40 hz tuning box mentioned by another member and found in the JBL Enclosure Guide, but the result isn't that good bass wise with an early dropping response below 200 hz and - 3 db @ 50 hz or so. I also tried the same 6/40 box in WIN ISD 2016 Edition (but with a more standard QL 7 box losses number instead of Win Isd's too optimistic default number of QL 10. That way things can be honestly compared with Winspeakers results). Well, the outcome isn't nicer for the same box and tuning. Response is almost - 4 db @ 50 hz. And if tuned a little higher at 45 hz then you get a bit flatter with - 2.5+ db @ 50 hz.
You can get a better curve than these. All depends on how low do you really want to go and box size/tuning you can accept realistically... If I remember correctly, you mentioned before smallest box possible. This ain't a bad idea considering the E-155 very low Qts of 0.20 suitable for "small" boxes. But this is an 18" !
Based on JBL's above-mentioned Manual, 3 cu. ft. would be the minimum acceptable, but that may not be large enough to achieve the low-end response you may have in mind. Do you have an F3 number in mind or box size is the major guiding factor regardless of low frequency cut-off ?
Richard
Hi Richard - Thank you for that reference doc. I had not seen it. I think I found my answer regarding an open/dipole configuration:
Sounds like I'd risk damaging the driver.
Yes, size is the top design goal. I expect it won't go too low. I'm leaning towards a 3 cu ft reflex box. Thanks!
Hi Val,
I tried a quick modeling in Winspeakerz with a 3.1 cu. ft. net box (the minimum size in the E-series Instruction Manual for E-155) and different tuning frequencies. The best compromise this time seems to be with an Fb of 55 hz. Response would be pretty flat in the bass range and would lead to an F3 of about 58-59 hz, which is not so bad considering such a large driver in such a small box size.
The software tells me the vent would require two 5 in. diameter vents of 6.167 in. long to tune the box at 55 hz. In order to see if such a box size has enough "breathing space" for vent length I checked in the software what 3.1 net meant re internal dimensions and I got: 28.3"H, 17.5" W, 10.8" D. So enough space for vent length. However, on width the cabinet is probably too short for the driver diameter so you may have to adjust cabinet dimensions a little. Which would be done anyway considering the next paragraph below...
According to JBL the volume displaced by an 18" driver is 0.3 cu. ft. (8.5 L) which you'll need to add to box gross volume, as well as bracing and vent volumes and anything else inside the box, in order to get to a 3.1 NET when everything is in place in the box...
BTW with an F3 of about 58-59 hz you may want to add a little EQ around 60 hz and get a little stronger and deeper bass from that small cabinet since you're close to Fb and the vent helps re cone excursion. Bingo!
Richard
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