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Multi-Way Conventional loudspeakers with crossovers

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Old 17th March 2003, 04:52 PM   #11
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I know you want to build a 3 way, but I think
a 3 way plus seperate subwoofer is the ideal choice.

The Lambda TD12 or TD15 is unbeaten sonically
if you cross it over low pass 300 - 500hz for
your 3 way, plus if you port the box and tune low,
you can get good low end as much as 10mm of xmax
allows.

But, I would still add a monster high excursion
subwoofer, pick a brand as there is many good ones,
as a seperate unit to compliment the 3 way
main system since these type of subwoofers perform
best for low end duty, *if* you need high SPL low end.

The Lambda TD sonics shine as in --> bass guitar, midbass,
and midrange. It's a wide band 10mm xmax woofer (heh),
it plays awesome full range so crossing it over low pass
is a no brainer for this driver at any frequency.

A standard woofer will not do this as well, especially
if you crossover high.

A high excursion "subwoofer" will sound horrible above 70hz-100hz.

The price on TD is $179, down from the normal price
of $259 ea. (march sale price). The Apollo version is normally
$409 US !!

I bought eight Apollos TD15's, worth the ~ $400 I paid.

I wouldn't even consider any other woofer for a 3 way,
it's that good, a steal for $179 (non apollo).
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Old 17th March 2003, 05:10 PM   #12
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Quote:
Originally posted by thylantyr
I know you want to build a 3 way, but I think
a 3 way plus seperate subwoofer is the ideal choice.

The Lambda TD12 or TD15 is unbeaten sonically
if you cross it over low pass 300 - 500hz for
your 3 way, plus if you port the box and tune low,
you can get good low end as much as 10mm of xmax
allows.
...
Hi,
How do you rate the Lambda PB12 (crossed over between 250-300 Hz)?

I dont need very high soundlevels, jus good, tight bass between 30-250/300 Hz. If it can do 100 dB at 30 Hz, that should be enough for me (I have neighbours )
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Old 17th March 2003, 07:37 PM   #13
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Quote:
Originally posted by Duck-Twacy

Hi,
How do you rate the Lambda PB12 (crossed over between 250-300 Hz)?

I dont need very high soundlevels, jus good, tight bass between 30-250/300 Hz. If it can do 100 dB at 30 Hz, that should be enough for me (I have neighbours )
I have not personally tried the PB series. If you need
information, I would ask the question on the madisound.com
forum to see if anyone has thoughts on that series.

Another place of research is the Lambda Acoustics
Yahoo group. You may find usefull information
searching the threads. Nick from Lambda posts
mainly on this message board (nicklambda).
http://groups.yahoo.com/group/LambdaDrivers/messages

There is some recent discussion on there that may help.
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Old 17th March 2003, 08:47 PM   #14
CarMan is offline CarMan  United States
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Quote:
A high excursion "subwoofer" will sound horrible above 70hz-100hz.
I've had some personal experience with these and this is VERY true. The frequency at which it starts to sound bad (loss in transient response, "tight bass") depends on the volume of the room. For car's they can go a bit higher, although not usually above 150-200hz. In a normal size sound room in house, 70-100hz is probably pretty accurate. This depends greatly on the sub though!

I currently have 2 16mm xmax (one way) 12" subs in my car, which can't play good sound above 180hz, and my xover is now set to 160hz. Be aware that I have them set up as a monopole/bipole (like dipole but same phase rather than reversed phase.) which helps the upper end a bit.
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Old 17th March 2003, 09:04 PM   #15
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Quote:
Originally posted by CarMan
I've had some personal experience with these and this is VERY true.
I've held similar beliefs. I was quite surprised when a local DIYer posted me this pic. Active XO at 220 Hz... pretty high up for a Shiva (mk 1). He is very pleased with the integration.

dave
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Old 17th March 2003, 09:14 PM   #16
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So a Lambda PB12 might not make it upto 300 Hz (in good quality of course)?? I also understood that the large dustcover may also impact the sound at higher frequenties.

I might be able to go down to 200 Hz Xover if I choose a slightly larger mid unit (for instance a Scanspeak), but not much lower.
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Old 17th March 2003, 09:29 PM   #17
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Quote:
Originally posted by Duck-Twacy
I might be able to go down to 200 Hz Xover if I choose a slightly larger mid unit (for instance a Scanspeak), but not much lower.
A Jordan JX92 would get you that low pretty easily...

dave
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Old 17th March 2003, 09:53 PM   #18
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Of course there are middrivers that can go that low (but they must still be able to do 3000 Hz).

My plans for the 3 way system are:
- a 12" woofer (still to be decided) to replace a 10 years old Focal 10" 10N511
- a 5" Focal Kevlar unit (3 years old) 5K413s (may be replaced after some time)
- a Hi-Vi RT2C_A (replacing a Focal T120K)

low/mid active Xover at 300 Hz (or lower)
mid/high passive Xover around 3000 Hz

Bass amp Plinius SA50MKIII
mid/high amp Aleph5 (still in progress)

A possible problem is the integration between the ribbon and the mid unit. The mid unit should be "fast" so the difference with the Hi-Vi is acceptable.

I hope to be able to use my old bass enclosure (66 L build of 30 mm MDF, maybe a little modified e.g extra layer on the baffle)
If not possible, then I'm willing to build a new one up to a 100 L.

If the speaker gives a good 30 Hz I'm satisfied.
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Old 17th March 2003, 09:58 PM   #19
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That speaker shown in post #15 is made out of a Dahlquist DQ-10 cabinet, no?
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Old 17th March 2003, 10:02 PM   #20
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Why can't I delete this??
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