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Old 13th February 2012, 07:15 PM   #1
JZatopa is offline JZatopa  United States
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Default Jantzen JA8008 alternatives

Troels tqwt is a speaker I would love to build one day. The problem is that once you add a shipping and the drivers and tax it is way out of my price range. Are there any more affordable alternatives available for this driver?

I was also wondering if someone could explain to me how Troels tunes the enclosure to increase the sensitivity of this driver as he mentions in the link below. I've never heard of this before and I thought sensitivity was solely a product of the driver(s) design and implementation. I.e. using two drivers in an mtm to increase sensitivity.

http://www.jantzen-audio.com/downloa...8_Aug10_v3.pdf
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Old 13th February 2012, 09:02 PM   #2
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FOSTEX FE206
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Old 13th February 2012, 10:41 PM   #3
sreten is offline sreten  United Kingdom
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Hi,

Presumably the box uses electrical BSC, nobbling the sensitivity,
whilst the TQWT use cabinet gain in the bass so no electrical
BSC is needed, and hence has higher sensitivity.

rgds, sreten.
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Old 14th February 2012, 12:11 PM   #4
LJNorth is offline LJNorth  United Kingdom
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The seas CA22RNY looks nearly identical, it built on exactly the same frame with the same magnet, but uses a damped paper cone, as for the magnet gap structure (copper etc.) pass. (the Jantzen is built by seas to a design by troels) The RNY has high sensitivity (about 92 dB) and excursion and good distortion figures (klang and ton review) unlike the fostex which isnt really similar to the jantzen.
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Old 14th February 2012, 04:08 PM   #5
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by LJNorth View Post
The seas CA22RNY looks nearly identical, it built on exactly the same frame with the same magnet, but uses a damped paper cone, as for the magnet gap structure (copper etc.) pass. (the Jantzen is built by seas to a design by troels) The RNY has high sensitivity (about 92 dB) and excursion and good distortion figures (klang and ton review) unlike the fostex which isnt really similar to the jantzen.
Hi,

The CA22RNY isn't as sensitive as the Jantzen due the the presumably extra coating and the
fact that its coil is 18mm long compared to the Jantzens 12mm, both have a 6mm magnet gap.

Double linear cone excursion = +6dB excursion limited max SPL and
due to the differences in sensitivity probably around 10 times the
power handling in the excursion limited region. The Jantzen does
suit low powered amplifiers, the Seas suits a lot more juice.

the Fostex's excursion limited bass SPL is very low, due to high sensitivity
so is the bass power handling, but it works with flea powered amplifiers.

rgds, sreten.
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Old 14th February 2012, 04:52 PM   #6
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I doubt you'll get a driver like the Jantzen JA8008 for budget money.

It may be worth asking over at the PartsExpress forum. PartsExpress have a huge selection of drivers and you can get some good bargains.

I was going to suggest the Peerless SKO204, but i've only seen it on eBay UK.
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Old 14th February 2012, 04:54 PM   #7
JZatopa is offline JZatopa  United States
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Quote:
Originally Posted by sreten View Post
Hi,

Presumably the box uses electrical BSC, nobbling the sensitivity,
whilst the TQWT use cabinet gain in the bass so no electrical
BSC is needed, and hence has higher sensitivity.

rgds, sreten.
Your right, I don't know how I missed that.
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Old 14th February 2012, 04:59 PM   #8
JZatopa is offline JZatopa  United States
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Looks like if I really want to build the twqt I will have to bite the bullet. I think it's a great design, it's a shame it's just so damn expensive.
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Old 14th February 2012, 05:36 PM   #9
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by DJNUBZ View Post
Looks like if I really want to build the twqt I will have to bite the bullet.
I think it's a great design, it's a shame it's just so damn expensive.
Hi,

Well if you want relatively high efficiency speakers at reasonable cost,
and have a decent 4 ohm capable amplifier probably check these out :

Zaph|Audio

Click the image to open in full size.

A genuine 90dB/2.83v/1m with full BSC is not too shabby. Simple x/o.

rgds, sreten.
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Last edited by sreten; 14th February 2012 at 05:39 PM.
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Old 14th February 2012, 09:04 PM   #10
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one alternative driver:
8NMB420 - High Output MB Neodymium Driver
I used it (16ohm version) paired at 1.8kHz with a ScanSpeak 6600 and it is VERY good, efficient and of high fidelity.
However I don't know where it is available in the USA.
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