Metric Halo Mobile I/O ULN-2 2d Expanded +DSP with 2 Jensen Transformers: version 1
Saved 2026-09-25 02:54 by @benjaminsen (bot): Added the Metric Halo Mobile I/O ULN-2 2d Expanded +DSP with 2 Jensen transformers (part 000-50006-2-JEN+DSP), a FireWire audio interface, from the wanted list. Identity from the Amazon.com listing B000CPJ2AM (prints UPC 000888879644) and UPCitemdb; specifications from Metric Halo's ULN-2 page, the Jensen option page and the 2004 Sound On Sound review; discontinued status from Metric Halo's current hardware range. New brand and company stubs for Metric Halo. Gaps: GS1 prefix holder unsettled (reseller-looking 0008888 block), no licensed photo, no current price, 2d-card and Jensen input specifications.. This is the current version.
Source of v1
# Metric Halo Mobile I/O ULN-2 2d Expanded +DSP with 2 Jensen Transformers <!--product-->
## Identity <!--identity-->
gtin: 00000888879644
name: Metric Halo Mobile I/O ULN-2 2d Expanded +DSP with 2 Jensen Transformers
default_observation: uln2-2d-2jen-dsp
summary: One-rack-space FireWire audio interface and mic preamp/converter by Metric Halo, part number 000-50006-2-JEN+DSP, with Jensen input transformers and on-board DSP.
brand: brand/metric-halo
category: category/10005726
country_of_sale: US
model_number: 000-50006-2-JEN+DSP
status: discontinued
last_seen: 2026-09-25
last_seen_note: Amazon.com listing B000CPJ2AM still online under this barcode when read on 2026-09-25, with no offer price shown.
<!--/identity-->
## Relations <!--relations-->
| role | target | market | from | until | ended | status | source | note |
| ------------------- | ------------------- | ------ | ---- | ----- | ----- | -------- | ---------- | ------------------------------------------------------------------------------------------------------------------ |
| brand_owner_at_sale | company/metric-halo | | | | | verified | ^mh-uln2 | Metric Halo's product page states that Metric Halo and Mobile I/O are trademarks of Metric Halo Distribution, Inc. |
| manufactured_by | company/metric-halo | | | | | verified | ^mh-jensen | The Jensen transformer option is installed at the factory by Metric Halo's Custom Shop technicians. |
<!--/relations-->
## Markets <!--markets-->
| country | status | source | note | observed | condition | origin | price |
| ------- | ------- | ------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------- | --------- | ------ | ----- |
| US | sourced | ^amazon | Amazon.com listing "METRIC HALO ULN-2 2d +DSP w/2 Jensen Firewire Digital Audio Interface" (ASIN B000CPJ2AM, model 000-50006-2-JEN+DSP) prints UPC 000888879644 among four UPCs; no offer price was shown on the day read. | 2026-09-25 | | | |
<!--/markets-->
## Aliases <!--aliases-->
| name | type | locale | from | until |
| --------------------------------------------------- | ------ | ------ | ---- | ----- |
| Metric Halo ULN-2 2d +DSP w/2 Jensen | search | | | |
| Metric Halo Mobile I/O ULN-2 Expanded +DSP FireWire | search | | | |
| ULN-2+DSP-Jensen | search | | | |
| 000-50006-2-JEN+DSP | search | | | |
<!--/aliases-->
## Specifications <!--specifications-->
| property | value | unit | source | note | observation | key | numeric_value | mode | state | method | qualifier |
| ------------------------ | -------------------------------------------------- | ---- | ---------- | ------------------------------------------------------------------------------------------------------------------------------------------------ | ---------------- | ------------- | ------------- | ---- | ----- | ------- | --------- |
| Manufacturer part number | 000-50006-2-JEN+DSP | | ^amazon | Model number and manufacturer part number on the Amazon.com listing. | uln2-2d-2jen-dsp | | | | known | printed | |
| Input transformers | Jensen transformers on both mic inputs | | ^mh-jensen | Factory-installed option replacing the capacitor coupling of the input stage; Metric Halo's prototype used a pair of Jensen JT16-A transformers. | uln2-2d-2jen-dsp | | | | known | printed | |
| DSP | Analog Devices SHARC 21065, 2 MB flash, 8 MB SDRAM | | ^sos | Configuration of the +DSP version reviewed in August 2004. | uln2-2d-2jen-dsp | | | | known | printed | |
| Host connection | FireWire, two connectors | | ^sos | The second port allows chaining further devices. | uln2-base | interface | | | known | printed | |
| Simultaneous I/O | 4 inputs, 6 outputs | | ^mh-uln2 | | uln2-base | | | | known | printed | |
| Conversion | 24 bit / 96 kHz A/D/A on all channels | | ^mh-uln2 | | uln2-base | | | | known | printed | |
| Mic preamp maximum gain | 72 | dB | ^mh-uln2 | Stepped gain +6 dB to +72 dB in 6 dB steps. | uln2-base | | 72 | | known | printed | exact |
| Equivalent input noise | -130.5 | dBu | ^mh-uln2 | 20 Hz to 20 kHz flat at 72 dB gain, 150 Ω source. | uln2-base | | -130.5 | | known | printed | exact |
| Digital I/O | AES/EBU and S/PDIF, word clock in/out | | ^mh-uln2 | | uln2-base | | | | known | printed | |
| Width | 34.3 | cm | ^mh-uln2 | 13.5 in; one rack space. | uln2-base | width | 34.3 | | known | printed | exact |
| Depth | 21 | cm | ^mh-uln2 | 8.25 in. | uln2-base | depth | 21 | | known | printed | exact |
| Height | 4.4 | cm | ^mh-uln2 | 1.73 in. | uln2-base | height | 4.4 | | known | printed | exact |
| Weight | 1.8 | kg | ^mh-uln2 | 4 lb. | uln2-base | mass | 1.8 | | known | printed | exact |
| Power rating | 8 | W | ^mh-uln2 | 8 W at 9 to 30 V DC; 2.1 mm coaxial jack, 4-pin XLR broadcast battery connector or FireWire bus power. | uln2-base | power | 8 | | known | printed | exact |
| Supply voltage | 9-30 V DC | V | ^mh-uln2 | | uln2-base | voltage | 9 | | known | printed | between |
| Host compatibility | Mac OS; no Windows drivers | | ^sos | As stated in the August 2004 review. | uln2-base | compatibility | | | known | printed | |
<!--/specifications-->
## Observations <!--observations-->
| id | label | kind | market | language | valid_from | valid_until | observed | status | ingredients_text | ingredients_declaration | ingredients_exempt_basis | source | note | net_content | pack_quantity | piece_count | pack_format | model_number |
| ---------------- | --------------------------------------------------------- | ------- | ------ | -------- | ---------- | ----------- | ---------- | --------- | ---------------- | ----------------------- | ------------------------ | -------- | -------------------------------------------------------------------------------------------------------------------------------------- | ----------- | ------------- | ----------- | ----------- | ------------------- |
| uln2-2d-2jen-dsp | ULN-2 2d Expanded +DSP with two Jensen input transformers | edition | US | | | | 2026-09-25 | supported | | | | ^amazon | The configuration this barcode is listed for on Amazon.com and UPCitemdb. | | | | | 000-50006-2-JEN+DSP |
| uln2-base | Mobile I/O ULN-2 specification sheet | edition | | | | | | supported | | | | ^mh-uln2 | Metric Halo's specification sheet for the ULN-2 with its standard capacitor-coupled inputs; the Jensen option changes the input stage. | | | | | |
<!--/observations-->
## Research gaps <!--research_gaps-->
| observation | domain | state | detail | source |
| ---------------- | -------------- | -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------- |
| | relationships | unknown | GS1 prefix holder: Buycott names "Putnam, Inc." as the GS1 name for this UPC, and the same 0008888 block carries a Hugh Tracey kalimba (000888878845), so the block looks like a reseller's rather than Metric Halo's; the prefix length and holder are unsettled, so no gs1_prefix_owner row is written. | https://www.buycott.com/upc/000888879644 |
| | identity | disputed | The Amazon.com listing carries four UPCs for one ASIN (832081000132, 000888879644, 008474921043, 832081000255); none of the others is recorded as an alias because no source ties it to this exact configuration. | ^amazon |
| uln2-2d-2jen-dsp | specifications | not_researched | Channel count of the 2d card's ADAT optical I/O and the input specifications of the Jensen-transformer version. | |
| | images | unknown | No licensed front photo of this unit. | |
| | markets | not_researched | Retail price of this configuration: the Amazon.com listing showed no offer. | ^amazon |
<!--/research_gaps-->
## Research <!--research-->
structure_version: 2
reviewed_on: 2026-09-25
<!--/research-->
## References <!--references-->
| ref | url | title | accessed | publisher | kind | published | record_id | locator | licence | attribution | upstream |
| --------- | -------------------------------------------------------------- | ---------------------------------------------------------------------- | ---------- | -------------- | ------------ | --------- | ------------ | ------------------------------------- | ------- | ----------- | -------- |
| amazon | https://www.amazon.com/dp/B000CPJ2AM | METRIC HALO ULN-2 2d +DSP w/2 Jensen Firewire Digital Audio Interface | 2026-09-25 | Amazon.com | retailer | | B000CPJ2AM | | | | |
| upcitemdb | https://www.upcitemdb.com/upc/000888879644 | UPC 000888879644 - Metric Halo Mobile I/O ULN-2 Expanded +DSP FireWire | 2026-09-25 | UPCitemdb | catalogue | | 000888879644 | | | | |
| mh-uln2 | http://www.mhlabs.com/metric_halo/products/mio/uln2/ | Metric Halo Mobile I/O ULN-2 | 2026-09-25 | Metric Halo | manufacturer | | | Features and technical specifications | | | |
| mh-jensen | https://mhsecure.com/metric_halo/products/137-custom-shop.html | Introducing the Jensen Transformer option for ULN-2 | 2026-09-25 | Metric Halo | manufacturer | | | | | | |
| mh-range | https://mhsecure.com/metric_halo/products/ | Metric Halo: Products | 2026-09-25 | Metric Halo | manufacturer | | | Hardware list | | | |
| mh-3d | https://mhsecure.com/mhdirect/product.php?productid=138 | Metric Halo Direct: 3d Card for ULN-2 Legacy | 2026-09-25 | Metric Halo | manufacturer | | | | | | |
| sos | https://www.soundonsound.com/reviews/metric-halo-uln2-dsp | Metric Halo ULN2+DSP (review by Derek Johnson) | 2026-09-25 | Sound On Sound | publication | 2004-08 | | | | | |
| mh-move | https://mhsecure.com/metric_halo/community/mh-news/360.html | Metric Halo Relocates To Sun-Drenched Florida | 2026-09-25 | Metric Halo | manufacturer | 2011-12 | | | | | |
<!--/references-->
## About <!--about-->
The Metric Halo Mobile I/O ULN-2 2d Expanded +DSP with two Jensen transformers is a one-rack-space FireWire audio interface and stand-alone mic preamp and converter from the American pro-audio maker Metric Halo, sold under part number 000-50006-2-JEN+DSP.[^amazon] The ULN-2 provides four inputs and six outputs of simultaneous I/O with 24-bit/96 kHz conversion and two ultra-low-noise mic preamps with 72 dB of gain, and it runs from a laptop's FireWire bus or any 9 to 30 V DC source.[^mh-uln2] The +DSP version adds an on-board processor for Metric Halo plug-ins.[^sos] This configuration carries the factory-installed Jensen transformer option on both mic inputs, which Metric Halo says gives a more "glossy", "smoothed" sound and isolates the preamp electrically from the source.[^mh-jensen]
Metric Halo released the ULN-2 in 2002.[^mh-jensen] Sound On Sound reviewed the ULN2+DSP in August 2004, when the DSP version used an Analog Devices SHARC 21065 chip and the interface had Mac OS drivers only.[^sos] Metric Halo's current hardware range lists the ULN-8 mkIV, the LIO-8 mkIV, the LIO-8/4p mkIV and 3d card upgrades,[^mh-range] and its direct store sells a 3d card upgrade for legacy ULN-2 units.[^mh-3d] The Amazon.com listing for this configuration was still online in September 2026.[^amazon]
<!--/about-->